1. vvvvvvvv - Global Traffic Technologies

1. vvvvvvvv - Global Traffic Technologies
Operation Manual
January 2009
Opticom™ Infrared System
700 Series
Emitters
Detectors
Phase Selectors
Discriminators
Accessories
Opticom™ Infrared System
Table of Contents
1.
Introduction ....................................................................................................................... 1-1
2.
System Theory of Operation .............................................................................................. 2-1
2-1. Major Components .................................................................................................................
2-1-1. Emitters .......................................................................................................................
2-1-2. Detectors ....................................................................................................................
2-1-3. Phase Selectors/Discriminators....................................................................................
2-1
2-1
2-1
2-1
2-2. Accessories ............................................................................................................................. 2-1
2-2-1. Confirmation Lights..................................................................................................... 2-1
2-2-2. Auxiliary Interface Panels............................................................................................ 2-1
2-3. Operation ............................................................................................................................... 2-1
3.
Emitters .............................................................................................................................. 3-1
3-1. Overview................................................................................................................................ 3-1
4.
3-2. Model 792 Series Emitters.......................................................................................................
3-2-1. Controls, Indicators, and Wiring .................................................................................
3-2-2. Specifications..............................................................................................................
3-2-3. Block Diagrams ..........................................................................................................
3-2
3-4
3-7
3-8
3-3. Model 492 Series Emitters.......................................................................................................
3-3-1. Controls, Indicators, and Wiring .................................................................................
3-3-2. Specifications..............................................................................................................
3-3-3. Block Diagram ............................................................................................................
3-9
3-9
3-11
3-12
Detectors ........................................................................................................................... 4-1
4-1. Overview................................................................................................................................
4-1-1. Detector Features ........................................................................................................
4-1-2. Configuring Detectors .................................................................................................
4-1-3. Detector Reception Angle ...........................................................................................
4-1-4. Detection Coverage ....................................................................................................
4-1
4-1
4-2
4-3
4-4
4-2. Model 700 Series Detectors ....................................................................................................
4-2-1. Model 711 Detector....................................................................................................
4-2-2. Model 721 Detector....................................................................................................
4-2-3. Model 722 Detector....................................................................................................
4-6
4-6
4-7
4-9
4-3. Operational Description ......................................................................................................... 4-10
4-4. Specifications ......................................................................................................................... 4-10
4-5. Block Diagrams ......................................................................................................................
4-5-1. Model 711 Detector....................................................................................................
4-5-2. Model 721 Detector....................................................................................................
4-5-3. Model 722 Detector....................................................................................................
5.
4-11
4-11
4-12
4-13
Phase Selectors/Discriminators .......................................................................................... 5-1
5-1. Overview................................................................................................................................ 5-1
5-2. Model 750 Series Phase Selectors ...........................................................................................
5-2-1. Controls, Indicators, Connectors, and Wiring ..............................................................
5-2-2. Operational Description .............................................................................................
5-2-3. Specifications..............................................................................................................
5-2-4. Block Diagrams ..........................................................................................................
5-2
5-2
5-9
5-15
5-16
i
Table of Contents
Opticom™ Infrared System
5-3. Model 450 Series Discriminators ............................................................................................. 5-20
5-3-1. Controls, Indicators, Connectors, and Wiring............................................................... 5-20
5-3-2. Operational Description .............................................................................................. 5-23
5-3-3. Specifications .............................................................................................................. 5-25
5-3-4. Block Diagrams ........................................................................................................... 5-26
6.
Accessories ........................................................................................................................ 6-1
6-1. Model 138 Detector Cable ...................................................................................................... 6-2
6-1-1. Specifications .............................................................................................................. 6-2
6-2. Model 560 System Chassis ...................................................................................................... 6-3
6-2-1. Wiring ......................................................................................................................... 6-4
6-2-2. Specifications .............................................................................................................. 6-6
6-3. Model 755 Four-Channel Adapter Card ................................................................................... 6-7
6-3-1. Specifications .............................................................................................................. 6-7
6-4. Model 756 Auxiliary Harness .................................................................................................. 6-8
6-4-1. Wiring ......................................................................................................................... 6-9
6-4-2. Specifications .............................................................................................................. 6-9
6-5. Model 757 Auxiliary Interface Harness .................................................................................... 6-10
6-5-1. Wiring ......................................................................................................................... 6-12
6-5-2. Specifications .............................................................................................................. 6-12
6-6. Model 758 Auxiliary Interface Panel ....................................................................................... 6-13
6-6-1. Wiring ......................................................................................................................... 6-14
6-6-2. Specifications .............................................................................................................. 6-15
6-7. Model 760 Card Rack.............................................................................................................. 6-16
6-7-1. Wiring ......................................................................................................................... 6-17
6-7-2. Specifications .............................................................................................................. 6-18
6-8. Model 798 Emitter Bezel Mount Kit ......................................................................................... 6-19
6-8-1. Specifications .............................................................................................................. 6-19
6-9. Emitter Reflector Lens Assy ...................................................................................................... 6-20
6-8-1. Specifications .............................................................................................................. 6-20
6-10. Model 832 Communication Module........................................................................................ 6-21
6-11-1. Specifications .............................................................................................................. 6-21
6-11. Interface Software .................................................................................................................... 6-23
6-12-1. ITS Link ....................................................................................................................... 6-23
6-12-2. 790 Series Interface Software (790-CS)......................................................................... 6-23
6-12-3. 750 Series Interface Software (750-CS)......................................................................... 6-23
7.
Maintenance ...................................................................................................................... 7-1
7-1. Preventive Maintenance ..........................................................................................................
7-1-1. Emitters........................................................................................................................
7-1-2. Detectors .....................................................................................................................
7-1-3. Phase Selectors/Discriminators ....................................................................................
7-1
7-1
7-1
7-2
7-2. System Maintenance................................................................................................................ 7-2
8.
Troubleshooting................................................................................................................. 8-1
A.
Glossary ............................................................................................................................ A-1
B.
Drive a Relay from a Phase Selector Output………………………………………………..…. B-1
ii
1. Introduction
This Operation Manual contains Opticom™
Infrared 700 series system operation,
maintenance, and troubleshooting information.
The manual is divided into eight sections and one
appendix. Section 2 contains a general operational
view of Opticom components, as well as a
description of how they work together in a
matched-component system.
Sections 3 through 6 are devoted to the
individual system components.
Section 7 describes how to maintain the system
to ensure proper system operation. Section 8
contains system and component troubleshooting
information.
Appendix A is a glossary of terms used in this
manual.
Appendix B describes how to connect a relay to
a phase selector/discriminator output.
Opticom™ Infrared System
2. System Theory of Operation
2-1. Major Components
The Opticom™ Infrared 700 series system
consists of three major component groups:
vehicle-mounted emitters, detectors mounted at
or near the traffic intersection, and phase selectors
or discriminators mounted in the traffic controller
cabinet.
2-1-1. Emitters
An emitter, with an appropriate emitter control
switch module, is mounted on the priority
vehicle. The emitter generates a series of pulses in
infrared and visible wavelengths.
2-1-2. Detectors
Detectors are mounted at or near the intersection
and are aimed so they have an unobstructed view
of the approach to the intersection. The pulses
generated by the emitter are sensed by the
detector, which converts the infrared energy into
electrical signals that are transmitted by the
detector cable to the phase selector/discriminator
in the traffic controller cabinet.
2-1-3. Phase Selectors/Discriminators
Phase selectors/discriminators are mounted in the
traffic controller cabinet. A phase selector/
discriminator discriminates between valid emitter
signals and other sources of energy received from
the detectors, and activates its outputs in response
to valid priority emitter signals. The phase
selector/ discriminator outputs are connected to
the traffic controller’s inputs to request the traffic
controller to deliver the desired green for the
priority vehicle.
Card racks or input files provide the power and
logic wiring for the phase selector/discriminator,
which plugs directly into a slot in the unit.
2. System Theory of Operation
2-2. Accessories
Some of the accessories used with 700 series
equipment include confirmation lights and
auxiliary interface panels.
2-2-1. Confirmation Lights
Confirmation lights are mounted at the
intersection and aimed at approaching traffic.
They are intended to indicate to emergency
vehicle drivers that their call was received.
Confirmation lights are not required for Opticom
system operation. They are optional.
Various patterns of confirmation light activity are
available. You can select a pattern appropriate
for your system needs and for those of the
surrounding jurisdictions (if appropriate). You
select the confirmation light pattern using 750
configuration interface software (750-CS).
2-2-2. Auxiliary Interface Panels
A Model 758 auxiliary interface panel is
recommended for installations using auxiliary
detectors and is required for installations with
confirmation lights that are controlled by the
phase selector. The auxiliary interface panel is a
terminal block assembly designed for easy
connections between the phase selector/
discriminator and the traffic controller wiring.
2-3. Operation
When an emitter-equipped vehicle, with the
emitter turned on, approaches an Opticom™
Infrared system equipped intersection, the
detector senses the emitter signals, converts the
infrared signals to electrical signals, and transmits
the signals by cable to the phase selector/
discriminator. The phase selector/discriminator
verifies the signal validity and requests the traffic
controller to give the approaching vehicle a green
light. This process of granting momentary right-ofway to an approaching priority vehicle continues
intersection-by-intersection as needed.
2-1
2. System Theory of Operation
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2-2
Opticom™ Infrared System
Opticom™ Infrared System
3. Emitters
3-1. Overview
The emitter, with an appropriate emitter control
switch module, is mounted on the priority
vehicle. When activated, the emitter generates a
series of pulses in infrared and visible
wavelengths. The detector mounted at the
intersection senses the emitter pulses. The sensed
pulses are processed and forwarded to a phase
selector or discriminator for further processing. A
system-level theory of operation is covered in
Section 2 of this manual.
Model 792 and 492 series emitters are rugged,
compact, lightweight, weather-resistant, encoded
signal devices intended for use on priority,
maintenance, and transit vehicles. In addition,
Model 792 series emitters can be used on probe
vehicles. Probe frequency does not provide
priority control; however, it does provide vehicle
presence (class and ID information) to Model
750 series phase selectors.
The emitter housing contains a
reflector/flashtube/ lens assembly, an integrated
power supply, and pulse timing circuitry.
Included with the emitter is an installation cable,
mounting hardware, and installation instructions.
The emitter may be surface mounted on the
vehicle with the bracket provided, recess
mounted into a vehicle panel with an optional
mounting kit, or mounted in a lightbar.
Most emitters have a clear lens, but some models
have an opaque lens that appears black. This
lens is known as a visible light filter and it filters
out wavelengths of light that are visible to the
human eye, but allows infrared wavelength
energy to pass. This type of operation is useful
for transit or probe vehicles where the visible
light from an emitter may be undesirable. The
visible light filter reduces the effective range of
the emitter.
3. Emitters
The emitter is electrically connected to a 12 volt
DC vehicle battery. The emitter converts the
vehicle battery voltage to the high voltage DC
required to power the xenon flashtube.
The timing circuit generates the control signal
that determines the emitter flash rate. Three base
flash rates are available:
•
14 Hz for High priority
•
10 Hz for Low priority
•
12 Hz for Probe mode
An emitter connected to a Model 793R emitter
control switch module is switchable between
base flash rates.
Encoded emitters generate extra pulses
between the pulses of the base flash rate. The
encoded pulses contain a vehicle class and
identification code. Emitters can also generate
an automated signal intensity threshold level
(range) code. This can be used to set the
maximum distance from the intersection at
which the phase selector or discriminator will
respond to the approaching vehicle. Only
Opticom™ Infrared system equipment can
decode an encoded emitter signal to provide
the vehicle class/identification code and the
range setting threshold information.
The emitter has a disable feature that turns off
the emitter automatically when a signal is
received from an outside source. A typical
sources for this signal is the driver’s door switch.
This signal requires a normally open switch
providing vehicle ground (DC return) upon
opening the driver’s door. Without a disable
switch, it is possible for the vehicle operator to
park the vehicle at the emergency site and
forget to turn off the emitter. Any Opticom
Infrared system equipped intersection in front of
the vehicle could be under priority control of
the parked vehicle. GTT recommends the use of
the disable feature.
3-1
3. Emitters
Opticom™ Infrared System
3-2. Model 792 Series Emitters
A Model 792 series emitter consists of a
reflector/flashtube/lens assembly with a built-in
power supply, an emitter installation cable, and
the appropriate emitter control switch module.
The emitter may be surface mounted, recess
mounted, or incorporated into the vehicle’s
lightbar.
The emitter has a disable switch option that
enables an existing vehicle switch (such as the
driver’s door switch) to turn off the emitter. Once
it is disabled, the emitter remains off until the
disable function is deactivated.
A Model 792 series emitter has a
communication port available by connecting
the appropriate interface cable assembly to a
PC or modem. You can use the communication
port to set all configurable parameters of the
emitter via 790 series configuration software
(790-CS). Information stored in the emitter is
also accessible via the configuration software.
It is also possible to communicate with the
emitter via the J1708 port to devices such as an
transit AVL computer.
Figure 3-1 shows a typical emitter installation on
a priority vehicle.
Figure 3-1. Typical Emitter Installation
3-2
Opticom™ Infrared System
Model 792H Emitter
This emitter is programmed with a fixed mode of
High priority control, and a base flash rate of
approximately 14 Hz. It has a clear lens permitting
emission of light in both visible and infrared
wavelengths. The transmission range is up to 2500
feet (762 meters). Model 792H emitters are
intended for use on emergency vehicles.
3. Emitters
With a Model 792R emitter, a Model 793R emitter
control switch module, and a Model 750 series
phase selector, the operating range can be set for
both High and Low priority control. A momentaryaction range-setting switch is used to implement
the automated signal intensity threshold level
adjustment. Refer to the Model 750 series phase
selector Installation Instructions for details about
setting the operating range.
Model 792HF Emitter
This emitter is programmed with a fixed mode of
High priority control, and a base flash rate of
approximately 14 Hz. It has a black (filtered) lens
permitting emission of light in only the nonvisible
infrared wavelength. The transmission range is up to
1800 feet (549 meters). Model 792HF emitters are
intended for use on emergency vehicles.
Model 792L Emitter
This emitter is programmed with a fixed mode of
Low priority control, and a base flash rate of
approximately 10 Hz. It has a clear lens permitting
emission of light in both visible and infrared
wavelengths. The transmission range is up to 2500
feet (762 meters). Model 792L emitters are
intended for use on emergency vehicles operating
in low priority.
Model 792T Emitter
This emitter is programmed with a fixed mode of
Low priority control, and a base flash rate of
approximately 10 Hz. It has a black (filtered) lens
permitting emission of light in only the nonvisible
infrared wavelength. The transmission range is up to
1800 feet (549 meters). Model 792T emitters are
intended for use on transit vehicles.
Model 792R Emitter
This emitter has three user-selectable base flash
rates of approximately 14 Hz for High priority, 10
Hz for Low priority, or 12 Hz for Probe mode. It
has a clear lens permitting emission of light in
both visible and infrared wavelengths. The
transmission range is up to 2500 feet (762 meters).
Model 792R emitters are intended for use on
maintenance vehicles.
3-3
3. Emitters
3-2-1. Controls, Indicators, and Wiring
Emitter Control Switch Modules
The following emitter control switch modules are
available for Model 792 series emitters. All of the
control modules include diagnostic indicators.
•
Model 793B Emitter Control Switch Module
The Model 793B emitter control switch
module can be used with Model 792H, HF, L,
T, and P emitters.
The Model 793B emitter control switch
module is a two position, on/off rocker switch
with a built-in indicator light. The rocker
switch is rated at 24 VDC, 7 ampere, 100,000
actuations. The built-in indicator lamp is rated
at 14 VDC.
This control switch may be knockout/panel
mounted or dash mounted with the simple
mounting bracket provided.
The rocker switch turns the emitter on or off
only. No provision exists with this model to
modify the emitter base flash rate.
The built-in indicator lamp is used for visual
indication of the emitter power on, optional
disable mode, and self-diagnostics.
•
Model 793S Emitter Control Switch Module
The Model 793S emitter control switch
module can be used with Model 792H, HF, L,
T, and P emitters.
The Model 793S emitter control switch
module has an alternate-action, on/off pushbutton switch with a positive latch down in
the ON position and a built-in indicator light.
A mounting bracket is included to mount the
unit under the dashboard.
The on/off switch turns the emitter on or off
only. No provision exists with this model to
modify the emitter base flash rate.
The built-in indicator lamp is used for visual
indication of the emitter power on, optional
disable mode, and self-diagnostics.
3-4
Opticom™ Infrared System
Model 793R Emitter Control Switch Module
The Model 793R emitter control switch
module can be used only with a Model 792R
emitter, which is intended for use on
maintenance vehicles only.
The Model 793R emitter control switch
module has an alternate-action, push-button
on/off switch with a positive latch down in the
ON position and a built-in indicator light, a
momentary-action range switch, and a threeposition rocker switch. A mounting bracket is
included to mount the unit under the
dashboard.
This emitter control switch module has an
Electronic Frequency Control Module (EFCM),
which is used to change the emitter High
priority flash rate to either the Low priority or
the Probe flash rate.
With the emitter power on and the threeposition rocker switch set to the center
position, the emitter flashes at the High priority
flash rate of 14 Hz. Moving the rocker switch to
the down position activates the built-in EFCM.
The EFCM provides a signal on the disable
control line, which switches the emitter to the
Low priority flash rate of 10 Hz.
Moving the rocker switch to the up position
causes the EFCM to provide a signal on the
disable control line, which switches the
emitter to the Probe flash rate of 12 Hz.
With the three-position rocker switch set to
the center position for High priority or the
down position for Low priority, the
momentary-action range switch can be
pushed and held for 15 seconds to
automatically set the signal intensity threshold
level for the selected priority control. Refer to
the Model 792R emitter Installation
Instructions for details about setting the
automated signal intensity threshold level.
Opticom™ Infrared System
3. Emitters
Diagnostic Indicators
Model 792 series emitters have some diagnostic
capabilities. In the event of a failure, the emitter
turns off automatically.
The built-in indicator lamps show the following
conditions:
•
The light is on steady (flickering is normal)
when the emitter is on and operating
normally.
•
The light flashes every other second (0.5 Hz)
when the emitter is disabled by the optional
disable switch.
•
The light flashes two times per second (2 Hz)
when a fault is detected that turns off the
emitter.
Note
For Model 792 series emitters,
additional information (fault types,
firmware version, model number, and
flash count) is available by using 790
series configuration software (790-CS).
Refer to the online Configuration
Software Help that comes with the 790
series configuration software.
3-5
3. Emitters
Opticom™ Infrared System
Disable Switch
Emitter Installation Cable
When activated, the optional disable switch turns
off the emitter. The disable switch is typically a
vehicle door switch, parking brake switch, or any
other switch that would be activated when the
emergency vehicle reaches its destination.
The emitter installation cable is 25 feet long with a
molded socket connector on one end. The cable
may be cut to length or spliced to meet specific
application requirements. The installation cable
socket connector mates with a corresponding pin
connector attached to the emitter cable. Figure 32 shows the cable connector pin view and Figure
3-3 shows the socket view.
When activated, the disable switch output is
grounded. When deactivated, the disable switch
output returns to an open (non-grounded) state.
The disable feature is software configurable to
Latching mode or Non-latching mode using 790
configuration software (790-CS). The factory
default is Latching mode.
•
•
Latching mode turns the emitter off when the
disable switch is activated. The emitter will
not turn on until the disable switch is
deactivated and the emitter control switch is
turned off for approximately 5 seconds and
then turned back on.
Figure 3-2. Cable Connector Pin View
Non-latching mode turns the emitter off when
the disable switch is activated and turns it
back on when the disable switch is
deactivated. Power does not need to be cycled
off and back on to turn on the emitter.
Figure 3-3. Cable Connector Socket View
Vehicle Identification Code
Encoded emitters generate extra pulses between
the pulses of the base flash rate. The encoded
pulses enable the emitter to generate a coded
signal that identifies the specific vehicle using the
Opticom™ Infrared system. The vehicle
identification code includes a class number (0 –
9) and an identification number (0 – 999). The
class/identification numbers can be combined to
form 10,000 unique vehicle identification codes
for each of the three base flash rates; a total of
30,000 codes.
The appropriate vehicle class/identification
numbers are determined at the time of installation
and are programmed by the user via 790 series
configuration software (790-CS). Refer to the online Configuration Software Help that comes with
the 790 series interface software.
3-6
Table 3-1 lists the pin, wire color, and function for
the wires in the emitter installation cable.
Table 3-1. Emitter Installation Cable Wiring
Pin
Wire Color
Function
1
Red
+12 VDC
2
Orange
Range setting enable
(input)
3
White
Disable (input)
4
Gray
Serial communication (B)
5
Green
DC return for indicator
light
6
Black
DC return
7
Blue
Serial communication (A)
Opticom™ Infrared System
3. Emitters
3-2-2. Specifications
Table 3-2. Model 792 Series Emitter Specifications
Physical Characteristics
Height ....................3.7 in (9.4 cm)
Width .....................5.8 in (14.7 cm)
Depth .....................3.5 in (8.9 cm)
Weight ....................1.9 lb (0.86 kg)
Electrical Requirements
Voltage ...................10 to 16 volts DC
Current, maximum ..Less than 5 amps DC
Environmental Requirements
Temperature ...........–30 to +165 F
(–34 to +74 C)
Humidity, relative ...5% to 95%
Operating Characteristics
Base flash rate
High priority ...........14.xxxx Hz ± 0.xxxxx Hz
Low priority ............9.xxxxx Hz ± 0.xxxxx Hz
Probe mode ............11.xxxx Hz ± 0.xxxxx Hz
Transmission range
Clear lens ...............2500 ft (762 m)
Black lens ...............1800 ft (549 m)
Encoding
Vehicle class ...........0 – 9
Vehicle ID ..............0 – 999
3-7
3. Emitters
Opticom™ Infrared System
Model 793S Emitter Control
Switch Module
ON/OFF
Switch
RED BATTERY
Model 792H, HF, L, T, P
Emitter
Fuse
(7A, 250V, 312)
RED
RED
+12 VDC RED
ORN
Range In ORN 2
+12 VDC
Disable In WHT
Vehicle
Battery
-DC Return
Serial B GRY
Lamp
GRN
DC Lamp Return GRN
BLK
DC Return BLK
Serial A BLU
Disable
Switch
(Optional)
WHT
Fuse RED/BLK
1
3
4
Power
Supply
and
Pulse
Timing
Circuit
KVDC
Flashtube
5
Trigger
6
7
KVDC Return
Emitter
Installation
Cable
WHT
Model 793B Emitter Control
Switch Module
ON/OFF
Switch
RED
Lamp
GRN
+12 VDC
DC Lamp Return
Opticom-413R
Figure 3-4. Model 792H, HF, L, T Emitter with Model 793S or B Emitter Control Switch Module
Model 793R Emitter Control
Switch Module
ON/OFF
Switch
RED BATTERY
Model 792R Emitter
Fuse
(7A, 250V, 312)
RED
Range
Switch
+12 VDC
Vehicle
Battery
-DC Return
RED
Lamp
+12 VDC RED
Range In ORN
Disable In WHT
ORN
GRN
BLK
BLK
Mode
Switch
100 Hz
EFC Module
200 Hz
WHT
Serial B GRY
DC Lamp Return GRN
DC Return BLK
Serial A BLU
1
2
3
4
Power
Supply
and
Pulse
Timing
Circuit
KVDC
Flashtube
5
6
7
Trigger
KVDC Return
Emitter
Installation
Cable
BLK
Disable
Switch
(Optional)
WHT
WHT
Optitom-411R
Figure 3-5. Model 792R Emitter with Model 793R Emitter Control Switch Module
3-8
Opticom™ Infrared System
3-3. Model 492 Series Emitters
3. Emitters
•
The Model 793B emitter control switch
module is a two position, on/off rocker switch
with a built-in indicator light. The rocker
switch is rated at 24 VDC, 7 ampere, 100,000
actuations. The built-in indicator lamp is rated
at 14 VDC.
Model 492 series emitters consist of a
reflector/flashtube/lens assembly with a built-in
power supply, an emitter installation cable, and
the appropriate emitter control switch module.
The emitters may be surface mounted, recess
mounted, or incorporated into the vehicle’s
lightbar.
This control switch may be knockout/panel
mounted or dash mounted with the simple
mounting bracket provided.
The emitters have a disable switch option that
enables an existing vehicle switch (such as the
driver’s door switch) to turn off the emitter. Once
it is disabled, the emitter remains off until the
disable function is deactivated.
Model 492H Emitter
The built-in indicator lamp is used for visual
indication of the emitter power on, optional
disable mode, and self-diagnostics.
•
This emitter is programmed with a fixed mode of
High priority control, and a base flash rate of
approximately 14 Hz. It has a clear lens
permitting emission of light in both visible and
infrared wavelengths. The transmission range is
up to 2500 feet (762 meters). Model 492H
emitters are intended for use on emergency
vehicles.
3-3-1. Controls, Indicators, and Wiring
The built-in indicator lamp is used for visual
indication of the emitter power on, optional
disable mode, and self-diagnostics.
Diagnostic Indicators
Model 492 series emitters have some
diagnostic capabilities. In the event of a failure,
the emitter turns off automatically.
The built-in indicator lamps show the following
conditions:
•
The light is on steady (flickering is normal)
when the emitter is on and operating
normally.
•
The light flashes every other second (0.5 Hz)
when the emitter is disabled by the optional
disable switch.
•
The light flashes two times per second (2 Hz)
when a fault is detected that turns off the
emitter.
Emitter Control Switch Modules
Two emitter control switch modules are
available for Model 492 series emitters. Both
switch modules include diagnostic indicators.
Model 793S Emitter Control Switch Module
The Model 793S emitter control switch
module has an alternate-action, on/off pushbutton switch with a positive latch down in
the ON position and a built-in indicator
light. A mounting bracket is included to
mount the unit under the dashboard.
Model 492HF Emitter
This emitter is programmed with a fixed mode of
High priority control, and a base flash rate of
approximately 14 Hz. It has a black (filtered) lens
permitting emission of light in only the nonvisible
infrared wavelength. The transmission range is up
to 1800 feet (549 meters). Model 492HF emitters
are intended for use on emergency vehicles.
Model 793B Emitter Control Switch Module
3-9
3. Emitters
Opticom™ Infrared System
Disable Switch
Emitter Installation Cable
When activated, the optional disable switch
turns off the emitter. The disable switch is
typically a vehicle door switch, or any other
switch that would be activated when the
emergency vehicle reaches its destination.
The emitter installation cable is 25 feet long
with a molded socket connector on one end.
The cable may be cut to length or spliced to
meet specific application requirements. The
installation cable socket connector mates with a
corresponding pin connector attached to the
emitter cable. Figure 3-7 shows the cable
connector pin view and Figure 3-8 shows the
socket view.
When activated, the disable switch output is
grounded. When deactivated, the disable switch
output returns to an open (non-grounded) state.
The disable mode is factory set to Latching mode
and is not changeable
Latching mode turns the emitter off when the
disable switch is activated. The emitter will not
turn on until the disable switch is deactivated
and the emitter control switch is turned off for
approximately 5 seconds and then turned back
on.
Vehicle Identification Code
Encoded emitters generate extra pulses
between the pulses of the base flash rate. The
encoded pulses enable the emitter to generate
a coded signal that identifies the specific
vehicle class using the Opticom™ Infrared
system. The encoded signal pattern generated
by the emitter is established prior to ordering
the emitter and is specified at the time of
procurement. Vehicle class selection (0 – 9) is
factory set during the manufacturing process.
Vehicle ID is not selectable and is factory set
to 1.
Figure 3-7. Cable Connector Pin View
Figure 3-8. Cable Connector Socket View
Table 3-3 lists the pin, wire color, and function
for the wires in the emitter installation cable.
Table 3-3. Emitter Installation Cable Wiring
Pin
3-10
Wire Color
Function
1
Red
+12 VDC
2
Orange
Range setting enable
(input)
3
White
Disable (input)
4
Gray
Not used
5
Green
DC return for indicator
light
6
Black
DC return
7
Blue
Not used
Opticom™ Infrared System
3. Emitters
3-3-2. Specifications
Table 3-4. Model 492 Series Emitter Specifications
Physical Characteristics
Height ....................3.7 in (9.4 cm)
Width .....................5.8 in (14.7 cm)
Depth .....................3.5 in (8.9 cm)
Weight ....................1.9 lb (0.86 kg)
Electrical Requirements
Voltage ...................10 to 16 volts DC
Current, maximum ..Less than 5 amps DC
Environmental Requirements
Temperature ...........–30 to +165 F
(–34 to +74 C)
Humidity, relative ...5% to 95%
Operating Characteristics
Base flash rate
High priority ...........14.xxxxx Hz ± 0.xxxxx Hz
Low priority ............9.xxxxx Hz ± 0.xxxxx Hz
Transmission range
Clear lens ...............2500 ft (762 m)
Black lens ...............1800 ft (549 m)
Encoding
Vehicle class ...........0 – 9 (factory set)
Vehicle ID ..............1 (factory default)
3-11
3. Emitters
Opticom™ Infrared System
3-3-3. Block Diagram
The Model 492 series emitters consists of a
reflector/flashtube/ lens assembly, an integrated
power supply, and a pulse timing circuit. An
emitter installation cable connects the emitter to
an emitter control switch module, which is
electrically connected to a 12 volt DC vehicle
battery.
Model 793S Emitter Control
Switch Module
ON/OFF
Switch
BATTERY
RED
Model 492H, HF, L, T
Emitter
Fuse
(7A, 250V, 312)
RED
RED
+12 VDC RED
Not Used ORN 2
ORN
+12 VDC
Disable In WHT
Vehicle
Battery
-DC Return
Not Used GRY
Lamp
GRN
DC Lamp Return GRN
BLK
DC Return BLK
Fuse RED/BLK
3
4
Lamp
KVDC
Flashtube
6
Trigger
KVDC Return
Emitter
Installation
Cable
WHT
Model 793B Emitter Control
Switch Module
ON/OFF
Switch
Power
Supply
and
Pulse
Timing
Circuit
5
Not Used BLU 7
Disable
Switch
(Optional)
WHT
1
RED
GRN
+12 VDC
DC Lamp Return
Opticom-443R
Figure 3-9. Model 492H, HF Emitter with Model 793S or B Emitter Control Switch Module
3-12
Opticom™ Infrared System
4. Detectors
4. Detectors
4-1. Overview
4-1-1. Detector Features
Detectors are typically mounted at or near the
intersection. The detector senses emitter pulses
and converts them from infrared energy to
electrical signals that are transmitted by the
detector cable to a phase selector or
discriminator in the traffic controller cabinet.
•
Transient voltage protection
•
Modular design
•
Detection cone angle of 8 degrees
•
Adjustable turret configuration which
accommodates aiming for skewed or slightly
curved approaches and wide approaches
with multiple lanes
•
Weather-resistant enclosure is lightweight,
durable, high impact polycarbonate
construction
•
Gray cover on Model 722 detector provides
aid to distinguish between Model 722 and
721 detectors from street level.
Since detectors are line of sight devices, they
must be mounted and aimed so they have an
unobstructed view of the approach to the
intersection. If there are obstructions that cannot
be removed, mount the detector in an alternate
location or mount additional detectors.
Detectors can be mounted upright on mast arms,
signal head framework, pedestals, or other
appropriate locations in line of sight of
controlled intersections. They can also be
inverted and suspended from a span wire over
the intersection.
Weep holes are provided to drain moisture from
the detector. The appropriate weep holes must
be opened by the installer. Additionally, drip
loops must be included in the detector cable
whenever the cable is exposed.
4-1
4. Detectors
Opticom™ Infrared System
CAUTION
4-1-2. Configuring Detectors
Detectors can be configured for either upright or
inverted mounting by simply rotating the tube
shells. Figure 4-1 shows how to convert a
detector for inverted mounting.
Before installing a detector, be sure there are no
obstructions limiting the view of the detector. If
there are obstructions that cannot be removed,
choose an alternate installation location.
CAUTION
CAUTION
Before installing a detector, punch out the
correct weep holes. Failure to punch out the
correct weep holes may result in failure of the
detector.
The detector has internal stops to prevent rotation
of the tube assemblies in excess of 360 degrees.
Do not force the tube assemblies past these
stops. Forcing the tube assemblies may result in
severe damage to the detector.
CAUTION
Forcing the detector into a tightened position by
rotating the detector body may severely damage
it. Secure the detector in place by tightening
the mounting hardware only.
A. Shells configured for
upright pedestal or
mast arm mounting.
WARNING
Connecting more than one detector signal wire
to a detector input terminal may damage the
detectors and may cause improper operation of
the input circuitry, which may result in
accidents and/or injuries. To avoid this
problem, connect only one detector signal
wire to each detector input terminal. Improper
operation of the traffic control system may
result in unsafe driver action.
B. By hand, rotate
tube shells 180
degrees.
C. Shells configured
for inverted span
wire mounting.
Figure 4-1. Tube Rotation for Upright or Inverted Mounting
4-2
Copyright © 2000, 3M IPC. All rights reserved.
Opticom™ Infrared System
4. Detectors
Detector Reception Angle
The detector reception angle varies with
distance. At a distance of 2500 feet (762 meters),
the reception angle is approximately 8 degrees.
Due to internal detector reflections, the reception
angle increases at close range.
Figure 4-2 shows a typical upright detector
installation on a pedestal and on a mast arm.
Figure 4-2. Upright Detector Pedestal/Mast Arm Installation
4-3
4. Detectors
4-1-3. Detection Coverage
Detectors have a conical detection angle of
approximately 8 degrees. The approximate
width of the detection area can be calculated
with the following formula:
0.1399 x n = Width of detection area
Where n is the distance (in feet) away from
the detector.
This formula can be used to determine if the
particular mounting location provides the
detection coverage expected. The detection
angle may appear to be greater than 8 degrees
near the detector. This is because of reflections
that occur within the detector at close range,
which is beneficial. These reflections augment
the detection range near the intersection, but
they do not cause adjacent intersection
detection.
4-4
Opticom™ Infrared System
Table 4-1 and Figure 4-3 show some typical
widths of the detection area versus distances
from the detector.
Table 4-1. Detection Width Versus Distance
Distance from
Detector (Feet)
Approximate Width of
Detection Area (Feet)
100
13
200
27
300
41
400
55
500
69
600
83
700
97
800
111
900
125
1000
139
1100
153
1200
167
1300
181
1400
195
1500
209
1600
223
1700
237
1800
251
1900
265
2000
279
2100
293
2200
307
2300
321
2400
335
2500
349
Opticom™ Infrared System
4. Detectors
Figure 4-3. Detection Width Versus Distance
4-5
4. Detectors
Opticom™ Infrared System
4-2. Model 700 Series Detectors
The Model 700 series detectors are available in
the following three models.
The Model 711 detector is also an ideal auxiliary
or advance detector.
A typical Model 711 detector application is
shown in Figure 4-5.
4-2-1. Model 711 Detector
The Model 711 detector (Figure 4-4) is a singleinput, single-output unit. It is used when a
detector controls a single narrow approach to an
intersection.
Figure 4-4. Model 711 Detector
Figure 4-5. 8-Phase, 4-Channel Application Using Model 711 Detectors
4-6
Opticom™ Infrared System
4. Detectors
4-2-2. Model 721 Detector
The Model 721 detector (Figure 4-6) is a dualinput, single-output unit. It is used to control
single approaches on wide roads with multiple
lanes. This is done by rotating the turrets so they
are both facing the same approach, but at slightly
different angles as shown in Figure 4-7. A 721
detector is recommended for most applications
The Model 721 detector may also used when
two approaches to the intersection will be
controlled together. For this application, the
detector must be mounted so that it receives
signals from both approaches as shown in
Figure 4-8. However coverage of one of the
approaches may be reduced.
Figure 4-6. Model 721 Detector
Figure 4-7. 8-Phase, 4-Channel Application Using Model 721 Detectors
4-7
4. Detectors
Opticom™ Infrared System
Figure 4-8. 4-Phase, 2-Channel Application Using Model 721 Detectors
4-8
Opticom™ Infrared System
4. Detectors
4-2-3. Model 722 Detector
The Model 722 detector (Figure 4-9) is a
dual-input, dual-output unit. It is used when
two approaches to the intersection will be
controlled independently. For this
application, the detector must be mounted so
that it receives signals from both approaches
as shown in Figure 4-10. However coverage
of one of the approaches may be reduced.
Figure 4-9. Model 722 Detector
Figure 4-10. 8-Phase, 4-Channel Application Using Model 722 Detectors
4-9
4. Detectors
4-3. Operational Description
A Model 700 series detector converts the infrared
pulses from an emitter into electrical signals and
transmits these signals via the detector cable to a
phase selector or discriminator in the traffic
controller cabinet.
The detector consists of a photo detector,
amplifier and signal conditioner, level shifter and
clipper, and a regulated power supply, all in a
weather-resistant enclosure. The photo detector
picks up the infrared pulses from the emitter. The
amplifier and signal conditioner shapes the photo
detector output into a signal the level shifter and
clipper can recognize. The level shifter and
clipper convert this signal into a series of pulses
that represent the intensity of the emitted signal.
The regulated power supply receives +24 VDC
from the phase selector/discriminator and outputs
+15 VDC and +7.5 VDC.
Opticom™ Infrared System
4-4. Specifications
Table 4-2. Model 700 Series Detector
Specifications
Physical Characteristics
Model 711 Detector
Height ............................. 5.63 in (14.3 cm)
Width ............................. 4.75 in (12.1 cm)
Length ............................. 12.0 in (30.5 cm)
Weight ............................ 0.88 lb (400 g)
Model 721/722 Detector
Height ............................. 7.13 in (18.1 cm)
Width ............................. 4.75 in (12.1 cm)
Length ............................. 12.0 in (30.5 cm)
Weight ............................ 1.12 lb (508 g)
Electrical Requirements
Input voltage ................... 24 to 28 volts DC
Current source ................ 50 milliamperes
minimum
Environmental Requirements
Temperature .................. –30 to +165 F
(–34 to +74 C)
Humidity, relative .......... 5% to 95%
Interface
Built-in terminal block .... Requires use of spade
lugs
Cable routing .................. Side entry through
metal cap and rubber
plug, or base entry
through treaded mount
Operating Characteristics
Detection angle .............. 8 in both horizontal
and vertical planes
Reception range .............. 200 ft (61 m), adjustable
up to 2500 ft (762 m)
under clear atmospheric
conditions
4-10
Opticom™ Infrared System
4. Detectors
4-5. Block Diagrams
4-5-1. Model 711 Detector
The Model 711 detector (Figure 4-11) consists of
a single photo detector, a signal conditioner, and
a regulated power supply. It is a single-input,
single-output device.
Figure 4-11. Model 711 Detector with Model 138 Detector Cable Block Diagram
4-11
4. Detectors
Opticom™ Infrared System
4-5-2. Model 721 Detector
The Model 721 detector (Figure 4-12) consists of
two photo detectors, a signal conditioner, and a
regulated power supply. Since the photo
detectors can sense emitter outputs
independently but feed the same signal
conditioner, the Model 721 detector is a dualinput, single-output device.
Figure 4-12. Model 721 Detector with Model 138 Detector Cable Block Diagram
4-12
Opticom™ Infrared System
4. Detectors
4-5-3. Model 722 Detector
The Model 722 detector (Figure 4-13) consists of
two independent units, each having a photo
detector, signal conditioner, and regulated power
supply. It is electrically equivalent to two Model
711 detectors in a single housing. The Model 722
detector is a dual-input, dual-output device.
Figure 4-13. Model 722 Detector with Model 138 Detector Cable Block Diagram
4-13
Opticom™ Infrared System
5. Phase Selectors/Discriminators
5-1. Overview
Model 750 series phase selectors and Model 450
discriminators perform discrimination and
arbitration functions. Discrimination is the ability
of a phase selector/discriminator to differentiate
between a valid emitter signal and other sources of
energy. Arbitration is the ability to treat same
priority inputs on a “first-come, first-served” basis,
and to override an Low priority input when a High
priority input is received. The circuitry arbitrates
between channels with conflicting requests for
priority.
Once discrimination and arbitration are complete,
the phase selector/discriminator sends a signal to
the traffic controller. This signal requests the traffic
controller to sequence to the desired green phase
for the approaching priority vehicle. The duration
of the signal sent to the controller is equal to the
duration of the emitter signal received plus a
selectable extension time .
Model 750 series phase selectors are capable of
decoding encoded emitter signals and creating and
storing information about the activity of the vehicle
(for example, vehicle location, travel direction,
user class and identification). There are ten vehicle
class codes and each class has 1000 vehicle
identification numbers. If a call is received from a
non-encoded emitter, it is logged with a zero
vehicle class and zero ID. All other call
information is retained. The phase selector can be
programmed to reject any encoded or nonencoded emitter, based on the vehicle class and ID
numbers.
Model 750 series phase selectors can also provide
Probe vehicle information by logging the
movement of designated Probe vehicles. The phase
selector places information about calls it has
received into a history log. The history log is stored
in non-volatile memory.
5. Phase Selectors/Discriminators
Model 750 series phase selectors have a
communication port that allows remote
communication through the use of a personal
computer or modem. Complete instructions
for using these remote communication
capabilities are in the 750 series
configuration software (750-CS) On-Line
Help.
Model 752/754 phase selectors and Model
452/454 discriminators are designed for use with
California/New York Type 170 traffic controllers,
and may be installed directly into the input files.
Some controllers require the installation of a
system chassis or card rack to house a phase
selector/ discriminator and facilitate connection
of the device to the traffic controller. The input
file/card rack provides the power and logic
wiring for the phase selector/discriminator.
Model 752/754 phase selectors and Model
452/454 discriminators work directly with NEMA 1
traffic controllers and virtually any other traffic
controller that can acknowledge external priority
control signals.
Model 752N/754N phase selectors perform all
the functions of Model 752/754 phase selectors
plus they send additional control signals to the
traffic controller to provide the sequence to the
desired green phase for the approaching priority
vehicle.
Model 752N/754N phase selectors are used
with NEMA traffic controllers that do not
incorporate internal preemption algorithms.
They are also used with traffic controllers that
do not recognize the 6.25 Hz pulsed low
priority control inputs. Other special modes of
operation are available with the 752N/754N.
Contact GTT Technical Service at 1-800-2584610 for more details.
1
National Electrical Manufacturer’s Association
5-1
5. Phase Selectors/Discriminators
Opticom™ Infrared System
5-2. Model 750 Series Phase Selectors
5-2-1. Controls, Indicators, Connectors, and
Wiring
Controls
Model 752/754 Phase Selectors
The Model 752 phase selector is a two-channel,
dual-priority, encoded-signal device (Figure 5-1).
The Model 754 phase selector is a four-channel,
dual-priority, encoded-signal device (Figure 5-2).
The phase selector front panel contains switches
for turning on the phase selector and generating
test signals. These switches can also be used to
reset all configurable parameters to their factory
settings, set each channel’s maximum detection
range, initiate diagnostics, and activate password
override mode. The front panel also has indicators
for observing module operation, and connectors
for auxiliary functions.
Figure 5-2. Model 754 Phase Selector
Model 752N/754N Phase Selectors
The main difference between Model
752N/754N phase selectors and Model 752/754
phase selectors is that Model 752N/754N phase
selectors are used with NEMA traffic controllers
that do not incorporate internal preemption
algorithms. They are also used with traffic
controllers that do not recognize the 6.25 Hz
pulsed low priority control inputs. Other
special modes of operation are available with
the 752N/754N. Contact 3M Technical Service
at 1-800-258-4610 ext 1 for more details.
The Model 752N phase selector is a twochannel, dual-priority, encoded-signal device
(Figure 5-3). Its front panel switches and
indicators are the same as those on the Model
752 phase selector.
The Model 754N phase selector is a fourchannel, dual-priority, encoded-signal device
(Figure 5-4). Its front panel switches and
indicators are the same as those on the Model
754 phase selector.
Figure 5-1. Model 752 Phase Selector
5-2
Opticom™ Infrared System
5. Phase Selectors/Discriminators
Figure 5-4. Model 754N Phase Selector
Figure 5-3. Model 752N Phase Selector
Power Switch
The power switch is a two-position toggle switch
that turns the phase selector on and off.
Test Initiate Switch
The test initiate switch is a three-position,
momentary-contact toggle switch. In the center
position, the switch is off. The test initiate switch
is used in conjunction with the function select
push-wheel switch to perform the functions
shown in Table 5-1.
5-3
5. Phase Selectors/Discriminators
Opticom™ Infrared System
Function Select Push-Wheel Switch
The function select push-wheel switch is an
8-position switch for Model 752/752N phase
selectors, and a 10-position switch for Model
754/754N phase selectors. The switch works in
conjunction with the test initiate switch to
perform the functions shown in Table 5-1.
Table 5-1. Model 750 Series Phase Selector Push-Wheel Switch Functions
Switch Position
A, B, C, D
Priority Control Output Test—Activates the output for the selected channel and
priority. Select the desired channel via the push-wheel switch (A, B, C, or D), then
push and hold the test initiate switch to the desired priority (H or L). The selected
channel and priority output are active while the test initiate switch is held, and
remain active for 6 seconds after releasing the switch.
E
Emitter Loopback Test—Verifies the communication link between a phase selector
and a Model 792 series emitter. Connect the phase selector’s front communication
port to the emitter using the appropriate connectors and adapters. Set the push-wheel
switch to the E position, then push and hold the test initiate switch to the desired
priority (H or L). Activate the test by releasing the test initiate switch. A successful
emitter loopback test is indicated by the channel A high priority indicator flashing at
a 2 Hz rate for 2 seconds.
F
Detector Function Test—Verifies proper operation of the Model 700 series detector
connected to each channel. Set the push-wheel switch to the F position, then push
and hold the test initiate switch to the desired priority (H or L). Activate the test by
releasing the test initiate switch. Each channel with a detector(s), which passes the
test, is indicated by the associated high priority indicator flashing at a 2 Hz rate for 2
seconds.
P
Password Override—Activates password override mode. Set the push-wheel switch
to the P position, then push and hold the test initiate switch to the desired priority (H
or L). Activate the password override mode by releasing the test initiate switch. The
password override mode remains active for 1 hour after releasing the test initiate
switch, or until the phase selector is reset.
R
Reset Parameters to Default—Resets all configurable parameters for the phase
selector to their factory settings. Set the push-wheel switch to the R position, then
hold the test initiate switch in either the H or L position while cycling the power off
then on. The test initiate switch must be held for a minimum of 2 seconds following
power up to initiate the reset to default action.
S
Set Channel and Priority Range—Sets the priority range for each channel. This
function requires the presence of a valid priority signal on the desired channel(s). Set
the push-wheel switch to the S position, then hold the test initiate switch in either the
H or L position while cycling the power off then on. The test initiate switch must be
held for a minimum of 6 seconds following power up to initiate the range setting
function. When you release the test initiate switch, the current signal intensity is the
range value stored.
blank
5-4
Function
Not used.
Opticom™ Infrared System
Default Configuration
When a Model 750 series phase selector is reset
to its default configuration, the history log,
internal registers, and programmable fields are
set to the following values:
History Log: No effect.
5. Phase Selectors/Discriminators
Indicators
POWER LED
The POWER LED is a green LED that lights
when the power switch is set to ON and power
is applied to the phase selector. The LED flashes
to indicate EEPROM or microprocessor faults.
High Primary Detector Range: Set to 300.
High Auxiliary Detector Range: Set to 300.
Low Primary Detector Range: Set to 1200.
Low Auxiliary Detector Range: Set to 1200.
High Priority Codes: Set all codes valid.
Low Priority Codes: Set all codes valid.
Maximum Call Time: All channels High and Low
set to 65535 seconds (18.2 hours) in v1.3 & 1.4
firmware. Set to 360 seconds in V2.08 and higher
firmware
HIGH LEDs
The HIGH LEDs are yellow LEDs, one for each
channel, that light when a Command (high)
priority call is active in a channel.
LOW LEDs
The LOW LEDs are yellow LEDs, one for each
channel, that light when an Advantage (low)
priority call is active in a channel.
Call Hold Time: All channels High and Low set to
6 seconds.
Call Delay Time: All channels High and Low set
to 0 seconds.
Desired Greens: All channels cleared.
Gated Advantage: Disabled.
Additional Green Time: All channels set to 254
seconds.
Lead End of Green Time: All channels set to 255
seconds.
Clearance Time: All channels set to 6 seconds.
Intersection Name: Cleared.
Channel names: Cleared
Limit Low Priority Calls: All calls allowed
Relative Priorities: All High Priorities equal, all
Low priorities equal
5-5
5. Phase Selectors/Discriminators
Edge Connectors
The edge connector is a 44-pin STD connector
that provides all electrical connections to the
phase selector except for auxiliary detector
inputs, green signal sensing, confirmation light
outputs, and NEMA control signal outputs and
priority outputs.
Table 5-2. Model 752/752N Phase Selector
Edge Connector Wiring
Pin
A
D
E
F
H
J
K
L
M
N
R
V
W
X
19
21
Function
Detector ground
Channel A primary detector input
Detector 24 VDC power output
Channel A priority output, collector (+)
Channel A priority output, emitter (–)
Channel B primary detector input
Detector ground
Earth ground
AC– in (AC return)
AC+ in (115 VAC)
Detector 24 VDC power output
Detector ground
Channel B priority output, collector (+)
Channel B priority output, emitter (–)
TXD (transmit data)
RXD (receive data)
Opticom™ Infrared System
Table 5-3. Model 754/754N Phase Selector
Edge Connector Wiring
Pin
A
D
E
F
H
J
K
L
M
N
P
R
S
T
U
V
W
X
Y
Z
19
21
Function
Detector ground
Channel A primary detector input
Detector 24 VDC power output
Channel A priority output, collector (+)
Channel A priority output, emitter (–)
Channel B primary detector input
Detector ground
Earth ground
AC– in (AC return)
AC+ in (115 VAC)
Channel C primary detector input
Detector 24 VDC power output
Channel C priority output, collector (+)
Channel C priority output, emitter (–)
Channel D primary detector input
Detector ground
Channel B priority output, collector (+)
Channel B priority output, emitter (–)
Channel D priority output, collector (+)
Channel D priority output, emitter (–)
TXD (transmit data)
RXD (receive data)
Figure 5-5. Phase Selector/Discriminator Edge Connector Pin Letters and Numbers
5-6
Opticom™ Infrared System
Auxiliary Connectors (J1)
The auxiliary connector (J1) is a 44-pin connector
on the phase selector front panel.
When connected to a Model 758 auxiliary
interface panel, the connector is used for auxiliary
detector inputs, green signal sensing, and
confirmation light outputs. For Model 752N/754N
phase selectors, the connector is also used for
NEMA control signal outputs and priority outputs.
When connected to a Model 757 auxiliary
harness, the connector is used for auxiliary
detector inputs and green signal sensing.
Table 5-4. Model 752 Phase Selector J1
Wiring
Pin
1
2
3
4
5
10
11
12
13
14
15
16
17
18
19
20
26
27
28
31
32
33
34
35
38
Function
Phase 1 green input (AC+)
Phase 2 green input (AC+)
Phase 3 green input (AC+)
Logic ground
Logic ground
Confirmation light 1 output
Confirmation light 2 output
Disable input
Channel A auxiliary detector 2
input
Channel B auxiliary detector 2
input
Channel B auxiliary detector 1
input
Phase 4 green input (AC+)
Phase 5 green input (AC+)
Phase 6 green input (AC+)
+24 VDC detector power output
+24 VDC detector power output
Confirmation light 3 output
Confirmation light 4 output
Channel A auxiliary detector 1
input
Phase 7 green input (AC+)
Phase 8 green input (AC+)
AC common (green sense)
Ground
Ground
Controller +24 VDC
5. Phase Selectors/Discriminators
Table 5-5. Model 754 Phase Selector J1 Wiring
Pin
1
2
3
4
5
10
11
12
13
14
15
16
17
18
19
20
26
27
28
29
30
31
32
33
34
35
38
43
44
Function
Phase 1 green input (AC+)
Phase 2 green input (AC+)
Phase 3 green input (AC+)
Logic ground
Logic ground
Confirmation light 1 output
Confirmation light 2 output
Disable input
Channel A auxiliary detector 2
input
Channel B auxiliary detector 2
input
Channel B auxiliary detector 1
input
Phase 4 green input (AC+)
Phase 5 green input (AC+)
Phase 6 green input (AC+)
+24 VDC detector power output
+24 VDC detector power output
Confirmation light 3 output
Confirmation light 4 output
Channel A auxiliary detector 1
input
Channel C auxiliary detector 2
input
Channel C auxiliary detector 1
input
Phase 7 green input (AC+)
Phase 8 green input (AC+)
AC common (green sense)
Ground
Ground
Controller +24 VDC
Channel D auxiliary detector 2
input
Channel D auxiliary detector 1
input
5-7
5. Phase Selectors/Discriminators
Table 5-6. Model 752N Phase Selector J1
Wiring
Pin
1
2
3
4
5
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
31
32
33
34
35
38
39
40
41
42
5-8
Function
Phase 1 green input (AC+)
Phase 2 green input (AC+)
Phase 3 green input (AC+)
Logic ground
Logic ground
NEMA phase omit 2 output (Ch. B
low)
NEMA phase omit 8 output
NEMA phase omit 6 output
Confirmation light 1 output
Confirmation light 2 output
NEMA inhibit
Channel A auxiliary detector 2 input
Channel B auxiliary detector 2 input
Channel B auxiliary detector 1 input
Phase 4 green input (AC+)
Phase 5 green input (AC+)
Phase 6 green input (AC+)
+24 VDC detector power output
+24 VDC detector power output
NEMA phase omit 4 output
NEMA phase omit 3 output
NEMA phase omit 1 output (Ch. A
low)
NEMA phase omit 7 output
NEMA phase omit 5 output
Confirmation light 3 output
Confirmation light 4 output
Channel A auxiliary detector 1 input
Phase 7 green input (AC+)
Phase 8 green input (AC+)
AC common (green sense)
Ground
Ground
Controller +24 VDC
NEMA manual control enable
NEMA interval advance
NEMA coordination isolation
NEMA free signal
Opticom™ Infrared System
Table 5-7. Model 754N Phase Selector J1 Wiring
Pin
1
2
3
4
5
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
38
39
40
41
42
43
44
Function
Phase 1 green input (AC+)
Phase 2 green input (AC+)
Phase 3 green input (AC+)
Logic ground
Logic ground
NEMA phase omit 2 output (Ch. B
low)
NEMA phase omit 8 output
NEMA phase omit 6 output
Confirmation light 1 output
Confirmation light 2 output
NEMA inhibit
Channel A auxiliary detector 2 input
Channel B auxiliary detector 2 input
Channel B auxiliary detector 1 input
Phase 4 green input (AC+)
Phase 5 green input (AC+)
Phase 6 green input (AC+)
+24 VDC detector power output
+24 VDC detector power output
NEMA phase omit 4 out (Ch. D low)
Phase omit 3 output (Ch. C low)
NEMA phase omit 1 output (Ch. A
low)
NEMA phase omit 7 output
NEMA phase omit 5 output
Confirmation light 3 output
Confirmation light 4 output
Channel A auxiliary detector 1 input
Channel C auxiliary detector 2 input
Channel C auxiliary detector 1 input
Phase 7 green input (AC+)
Phase 8 green input (AC+)
AC common (green sense)
Ground
Ground
Controller +24 VDC
NEMA manual control enable
NEMA interval advance
NEMA coordination isolation
NEMA free signal
Channel D auxiliary detector 2 input
Channel D auxiliary detector 1 input
Opticom™ Infrared System
5. Phase Selectors/Discriminators
Communication Port Connector
Discrimination
The communication port connector is a 6-pin
connector on the front panel of a Model 750
series phase selector into which a 700 series
communication cable is connected. The
communication cable connects the phase
selector to a PC or a modem for remote
communication. A 9-pin to 25-pin
“nullmodem” adapter may be required for
communication to a modem.
All inputs from detectors go to detector signal
conditioning circuits. Each signal conditioner has
three input sources: the primary detector and two
auxiliary detectors. Primary detector inputs enter
the signal conditioner through the edge connector.
Auxiliary detector inputs are routed through
connector J1 on the phase selector’s front panel.
Table 5-8. Communication Port Wiring
Pin
1
2
3
4
5
6
Function
RXD ( receive data)
Ground
TXD (transmit data)
RTS (ready to send)
CTS (clear to send)
Shield
5-2-2. Operational Description
A Model 750 series phase selector consists of
detector signal conditioning circuits (one per
channel), a discriminator microprocessor (one
for each pair of channels), and a main
microprocessor. The phase selector also has a
power supply that converts input AC voltage to
the DC voltages necessary for phase selector
and detector operation.
Power Supply
The power supply input AC voltage is protected
with a 1 amp fuse located on the phase selector
circuit board. The power supply outputs the
following voltages: +5 VDC for the logic circuits,
–7 VDC for the serial communication circuits, and
+24 VDC for the detectors.
The discriminator microprocessor handles two
conditioned detector signals. It examines the input
signals to determine if they are valid emitter
signals, and have sufficient amplitude. If the input
signals satisfy both criteria, they are sent to the
main microprocessor.
The main microprocessor checks the validity of
the received code and checks to see if more than
one input has been received.
Arbitration
If two or more discriminator inputs are active,
arbitration of the inputs occurs. The main
microprocessor examines their priority levels and
if the inputs are the same priority, it assigns
priority on a “first-come, first-served” basis.
Relative Priority
The Relative Priority feature allows assignment
of a priority weight factor for each class in each
priority category. The priority weight factors are
from 0 to 9, with 9 being the highest weight
factor. High priority has 10 vehicle classes (0 to
9) and Low priority has 10 vehicle classes (0 to
9).
High priority vehicles always have higher priority
than Low priority vehicles. If a phase selector is
sensing several different emitters at the same time,
then the emitter that is transmitting a valid code
and has the highest relative priority results in the
phase selector servicing that vehicle first.
Real-Time Clock
The phase selector contains a real-time clock. The
real-time clock is set to local time by the user. It
records the actual time of calls. The clock has a
power backup circuit, and retains the correct time
for up to 24 hours.
5-9
5. Phase Selectors/Discriminators
Range Intensity
Intensity is a value from 0 to 1200 that indicates
the relative strength of the emitter’s signal
received by the detector as measured at the phase
selector. A range intensity value of 300 allows
detection of weak signals from a far-away emitter
and also strong signals from a near emitter.
Complete instructions for setting range intensity
are in the 750 series configuration software (750CS) On-line help.
The following table can help you estimate the
detection range that may result from a given
signal intensity value.
Intensity Value
350
380
435
470
500
570
675
790
840
Range in Feet
2250 to 2500
1950 to 2250
1650 to 1950
1350 to 1650
1050 to 1350
750 to 1050
450 to 750
150 to 450
100 or less
Gated Advantage Priority
Gated Advantage Priority is a phase selector
feature that allows vehicles such as buses, which
are equipped with an Low priority emitter, to be
granted additional green time at Opticom
equipped intersections. This feature minimizes the
negative effects on coordination. The additional
green time is granted by placing a priority request
to the traffic controller at a time determined by
the phase selector algorithm. Depending on what
part of the cycle the controller is in, the additional
green time may be placed at either the beginning
or the end of the phase.
When the Gated Advantage Priority feature is
used, the greens are not completely out of
sequence with coordinated movements. This
minimizes the impact of a priority control call on
a coordinated system. Traffic control systems can
usually recover coordination within one cycle if
additional green time is set, as recommended, to
be less than 8 percent of the average cycle time.
5-10
Opticom™ Infrared System
In order to use the Gated Advantage Priority
feature, it is necessary to use the Green Sense
feature of the phase selector to monitor the
green lights.
Note: This feature (Gated Advantage Priority)
is used when the traffic controller does not
have internal Transit Signal Priority (TSP)
capabilities. Do not use this feature if you are
using the controller’s Low Priority (TSP)
function.
Green Sense
By using the Green Sense feature, the phase
selector is able to monitor the cycle times and
determine when to place a priority request call
to the traffic controller. The phase selector has
internal algorithms that determine when to
issue a priority request based on the cycle
times of the green lights and the Gated
Advantage Priority settings in the phase
selector.
The green signal sensing inputs are part of the
auxiliary connection. These signals come directly
from the AC output of the load switch for each
green light. These inputs are optically isolated to
protect the phase selector and the equipment
connected to it. Green signal sensing also
provides timing and status information for the
history log.
Additional Green Time
The Gated Advantage Priority setting for additional
green time specifies the additional number of
seconds that the desired green phase is provided
when an Low priority emitter signal is present. For
example, when the average cycle time of the
desired green phase is 50 seconds, an additional
green time of 10 seconds would result in a green
cycle time of 60 seconds when an Low priority
emitter signal is present.
Additional green time is settable from 1 to 254
seconds in 1-second increments. Additional green
time can be set to different values for each phase
selector channel. Traffic control systems can
usually recover coordination within one cycle if
additional green time is set to be less than 8
percent of the average cycle time. Instructions for
setting additional green time are in the 750 series
configuration software (750-CS) Online help.
Opticom™ Infrared System
Clearance Time
The Gated Advantage Priority setting for
clearance time specifies the typical time the traffic
controller takes to change the intersection from an
opposing phase to the desired greens phasing.
This setting determines when the phase selector
places a call to the traffic controller, which is
when a Low priority emitter signal is detected and
the desired greens are not being displayed. The
clearance time plus the additional green time is
the amount of time prior to the normal start of the
desired greens that the call is placed.
Clearance time is settable from 1 to 255
seconds in 1-second increments. Clearance time
can be set to different values for each phase
selector channel. Instructions for setting
clearance time are in the 750 series
configuration software (750-CS) Online help
Desired Greens
The Gated Advantage Priority algorithm monitors
the greens so that a priority request can be
granted during the appropriate phase or phases.
The desired greens setting tells the phase selector
which green indications (desired greens) the
traffic controller should display during a Gated
Advantage Priority call. The desired greens setting
for each channel should match the priority greens
that are programmed into the traffic controller.
For example, if the controller is programmed to
display phases 2 and 6 for a channel B call, set
desired greens 2 and 6 for channel B. Instructions
for setting desired greens are in the 750 series
configuration software (750-CS) Online help.
Lead End of Green Time
The Gated Advantage Priority setting for lead end
of green time determines when the phase selector
places a call to the traffic controller, which is
when an Low priority emitter signal is detected
and the desired greens are being displayed. The
time is measured in seconds before the end of the
desired phase. For example, setting the lead end
of green time to 10 seconds when the average
duration of the desired phase is 50 seconds allows
calls to occur only after 40 seconds of green time
has elapsed and 10 seconds remain. Additional
green time (if selected) is then added to the end of
the desired green phase.
5. Phase Selectors/Discriminators
If the desired greens are active at the start of the
call, the priority output is not generated until the
desired greens have been displayed for the average
desired green time minus lead end of green time.
The priority output is delayed until this time to
allow the vehicle to pass through the intersection
without generating a priority request if possible.
Lead end of green time is settable from 1 to 255
seconds in 1-second increments. This time can be
set to different values for each phase selector
channel. Instructions for setting lead end of green
time are in the 750 series configuration software
(750-CS) Online help.
Priority Outputs
Depending on the input priority and channel, the
microprocessor outputs either a 6.25 Hz pulse for
Low priority, or a solid low (ground) for High
priority on the proper priority output channel.
These outputs are provided to the traffic controller
and are optically isolated to protect the phase
selector and the traffic controller. Model
752N/754N phase selectors can be configured to
provide solid low outputs via the auxiliary
connector (J1).
Confirmation Lights
Model 750 series phase selectors provide four
outputs for confirmation lights via the Model 758
auxiliary interface panel. The phase selector
activates the outputs based on green signal
sensing and user-selectable patterns. These
outputs are used to control devices such as a load
switches or relays that provide power to the
confirmation lights. The outputs are optically
isolated to protect the phase selector.
Confirmation light outputs are available only to
the highest priority of the High priority requests
being received. See the Model 750 series
installation manual for details on how to make
these connections.
5-11
5. Phase Selectors/Discriminators
Opticom™ Infrared System
NEMA Control Signals
Serial Communication Ports
Model 752N/754N phase selectors provide
twelve outputs for interfacing to NEMA controllers
that do not have internal priority control
algorithms. The outputs are: Manual Control
Enable (1), Interval Advance (1), Phase Omits (8),
and Coordination Isolation (1), Free (1). These
outputs are used to sequence the traffic controller
to the desired green for the priority vehicle. The
outputs are optically isolated to protect the phase
selector.
Model 750 series phase selectors have an RS-232
serial port on the front panel to interface to a PC
or modem. The serial port is configured as a multidrop output to allow multiple phase selectors to
share the same RS-232 line. A rear
communication port jumper board is provided to
connect the front communication port in parallel
with the card edge communication port on card
edge pins 19 and 21 (Figure 5-5).
When a call is detected, the Manual Control
Enable, Coordination Isolation and Free outputs
become active low, which stops the automatic
phasing of the controller. The Phase Omit outputs
are set active low to omit all phases that are not
specified in the High Priority Desired Greens or
Low Priority Desired Greens parameter,
depending on the call priority.
Then, for as long as the priority output is
necessary, the controller green phases are
monitored (via the Green Sense inputs), and if
they do not match the desired phases, the Interval
Advance output is toggled low for 100 ms ±10 ms
to advance the controller to its next allowed
phase setting. If the desired phases are not present
after toggling the Interval Advance output one
time, the phase selector waits the amount of time
specified by either the HIgh Priority Minimum
Green Time or the Low Priority Minimum Green
Time, depending on the call priority, and then
toggles the Interval Advance output again.
When the call ends, all Phase Omit outputs that
are not specified in the Desired Recovery Phases
are set active low. The Interval Advance output is
toggled again as described until the desired
phases are reached. After a delay equal to the
Recovery Green Time, the Manual Control Enable
and Coordination Isolation outputs are both
deactivated. One second after release of the
Manual Control Enable and Coordination
Isolation outputs, all Phase Omit outputs are
deactivated (set high).
If the Green Sense inputs have not changed state
for more than 4 minutes, all NEMA outputs are
disabled (high output).
5-12
A separate rear communication port is available
by installing an optional Model 832
communication module. This communication
module provides a multi-drop RS-232 serial port
to the rear 44-pin edge connector. The front and
rear communication ports can operate
independently and simultaneously.
Both the front and rear communication ports
must be properly terminated. For details about
terminating the front and rear communication
ports, refer to the Model 750 series phase
selector Installation Instructions.
Jumper Board Configurations
For Model 754 phase selectors with firmware of
version 1.4 or higher, the rear communication
port jumper boards can be used to reassign
channel outputs. One jumper board is installed in
the top position on the phase selector (Figure 5-5).
Additional jumper boards (stock number
78-8114-5369-1) are available from GTT. You
can order them from your GTT representative.
Table 5-9 lists the jumper board configurations
and shows whether the channels are assigned in
the standard order of A, B, C, D or reassigned to
C, D, A, B. The table also shows which
communication port(s) are active.
Opticom™ Infrared System
5. Phase Selectors/Discriminators
Figure 5-6. Communication Port Jumper Board Positions
Table 5-9. Jumper Board Configurations (Firmware Version 1.4 or Higher)
Jumper Board(s) Installed
Channel Assignment
Communication Port(s) Active
Top
Standard A, B, C, D
Front port only
Bottom
Reassigned C, D, A, B
Front and rear ports in parallel
Top and bottom
Standard A, B, C, D
Front and rear ports in parallel
No jumper boards installed
Reassigned C, D, A, B
Front port only
Model 832 communication
module installed
Reassigned C, D, A, B
Front port and independent rear port
5-13
5. Phase Selectors/Discriminators
Opticom™ Infrared System
Communication Modes
Two communication modes are provided: normal
communication mode and phase selector to
emitter mode. In the normal communication
mode, the phase selector’s RS-232 serial port is
connected to a PC. The PC provides commands to
the phase selector or phase selectors. Each phase
selector on a multi-drop network has a unique
address.
In the phase selector to emitter mode, the phase
selector’s front RS-232 serial port is connected to
a Model 792 series emitter through the
appropriate connectors and adapters. In this
mode, the phase selector provides commands to
set the emitter priority and class/identification
codes, and turns the emitter on and off.
Communication restrictions for this mode are: the
phase selector can control only one emitter, 9600
baud, and front serial port only.
History Log
The microprocessor writes data into its history log
at the end of the call. The history log contents can
be retrieved remotely by traffic maintenance
personnel through the communication port on the
front panel of the phase selector.
The log is stored in an Electrically Erasable
Programmable Read Only Memory (EEPROM)
with enough space for the most recent 1000
Opticom system calls. Each logged entry includes
the following items:
Item
Log #
Description
Number of a call history entry.
Item
Start
Time
Date when the call started. This is always
displayed in MM/DD/YY format.
End Time
Time-of-day when a call ended. This is
always displayed using a 24-hour clock.
The end of a call is considered to be when
the call hold time (if any) expires. The call
hold time starts when the phase selector no
longer senses a valid emitter signal.
Duration
Duration of call, which is the elapsed time
from Start Time to End Time.
Class
Vehicle Class (0 to 9) of the received
emitter signal. Range appears here if the
call was placed by a range-setting emitter.
ID
Vehicle ID (0 to 999) of the received
emitter signal. Range appears here if the
call was placed by a range-setting emitter.
Chan
Channel on which the emitter signal was
sensed.
Priority
Priority of the received emitter signal. This
is indicated as “Cmd” for Command,
“Adv” for Advantage, and “Probe” for
Probe.
G. Time
Number of seconds that the final greens
were active. Maximum recorded time is 255
seconds.
Final G.
Indication of the green sense inputs which
were active at the End Time. The green
sense inputs must be wired per the phase
selector’s Installation Instructions to get
valid Final G. information. This entry
should correspond to the desired greens
that were selected for the call’s priority.
Intensity
Maximum measured intensity of an
emitter’s signal.
This intensity always exceeds the
corresponding preset detection threshold
that you can view/modify on the Range
Intensity window.
The real-time clock in the phase selector
is used as the basis for the Date, Start
Time, and End Time.
Preempt
5-14
Time-of-day when a call started. This is
always displayed using a 24-hour clock.
The start of a call is considered to be when
the call delay time (if any) expires. The call
delay time starts when the emitter signal is
validated by the phase selector.
Entries are numbered chronologically as
they occur. The phase selector can store
up to 1000 entries. After entry 1000
occurs, new entries are written over the
oldest entries starting at entry number 1.
Date
Description
Indicates whether the output on the
channel was active during the call. “Yes”
indicates it was active, and “No” indicates
it was not active during the call.
Opticom™ Infrared System
5. Phase Selectors/Discriminators
5-2-3. Specifications
Table 5-10. Model 750 Series Phase Selector Specifications
Physical Characteristics
Height......................................... 4.5 in (11.4 cm)
Width ......................................... 1.1 in (2.8 cm) (Model 752/752N phase selectors)
2.3 in (5.8 cm) (Model 754/754N phase selectors)
Length......................................... Without handle 7.0 in (17.8 cm)
With handle 8.2 in (20.8 cm)
Weight ........................................ 0.53 lb (240 g) (Model 752/752N phase selectors)
0.57 lb (260 g) (Model 754/754N phase selectors)
Electrical Requirements
Voltage ....................................... 89 to 135 VAC, 60 Hz
Current, maximum draw ............. 300 milliamperes
Environmental Requirements
Temperature ............................... –30° to +165°F (–34° to +74°C)
Humidity, relative ....................... 5% to 95%
Operating Characteristics
Dual-priority channels ................ Two channels (Model 752/752N phase selectors)
Four channels (Model 754/754N phase selectors)
Priority, each phase selector
Same priority .............................. First-come, first-served
Dual priority ............................... High priority overrides Low priority
Detector Inputs
Phase selector only ..................... One primary input per channel through card edge connector
With cable harness .................... Two auxiliary inputs per channel through front panel connector
Range setting control .................. Through remote communication port, range-setting emitter, or front
panel and emitter
Solid-state indicators
Power on .................................... One green LED
High priority signal ..................... Yellow LEDs, one for each channel
Low priority signal ...................... Yellow LEDs, one for each channel
Test initiate switch ......................
Input signals
High priority ...............................
Low priority ................................
Probe mode ................................
Output signals
High priority ...............................
Low priority ................................
Output control timers
Maximum call time .....................
Call hold time .............................
Call delay time............................
Additional green time .................
Lead end of green time ...............
Clearance time............................
Operates with function select switch to initiate selected function
14.XXXXX Hz ± 0.XXXXX Hz
9.XXXXXHz ± 0.XXXXX Hz
11.XXXXX Hz ± 0.XXXXX Hz
Optically isolated NPN steady on
Optically isolated NPN pulsed wave at 6.25 Hz ± 0.02 Hz
Settable from 60 to 65535 seconds in 1-second increments
Settable from 1 to 255 seconds in 1-second increments
Settable from 0 to 255 seconds in 1-second increments
Settable from 1 to 254 seconds in 1-second increments
Settable from 1 to 255 seconds in 1-second increments
Settable from 1 to 255 seconds in 1-second increments
History log .................................. Stores 1000 most recent activities
5-15
5. Phase Selectors/Discriminators
Opticom™ Infrared System
5-2-4. Block Diagrams
Model 752 Phase Selector
The Model 752 phase selector has four functional areas: detector signal conditioning circuits, discriminator
microprocessor, main microprocessor, and power supply (Figure 5-6).
Figure 5-7. Model 752 Phase Selector Block Diagram
5-16
Opticom™ Infrared System
5. Phase Selectors/Discriminators
Model 754 Phase Selector
The Model 754 phase selector has four functional areas: detector signal conditioning circuits, discriminator
microprocessor, main microprocessor, and power supply (Figure 5-7).
Figure 5-8. Model 754 Phase Selector Block Diagram
5-17
5. Phase Selectors/Discriminators
Opticom™ Infrared System
Model 752N Phase Selector
The Model 752N phase selector has four functional areas: detector signal conditioning circuits,
discriminator microprocessor, main microprocessor, and power supply (Figure 5-8).
Figure 5-9. Model 752N Phase Selector Block Diagram
5-18
Opticom™ Infrared System
5. Phase Selectors/Discriminators
Model 754N Phase Selector
The Model 754N phase selector has four functional areas: detector signal conditioning circuits,
discriminator microprocessor, main microprocessor, and power supply (Figure 5-9).
Figure 5-10. Model 754N Phase Selector Block Diagram
5-19
5. Phase Selectors/Discriminators
Opticom™ Infrared System
5-3. Model 450 Series Discriminators
5-3-1. Controls, Indicators, Connectors, and
Wiring
Controls
Model 452/454 Discriminators
Power Switch
The Model 452 discriminator is a two-channel, dualpriority, encoded-signal device (Figure 5-12). Its
front panel switches and indicators are the same as
those on the Model 752 phase selector.
The power switch is a two-position toggle
switch that turns the discriminator on and off.
The Model 454 discriminator is a four-channel, dualpriority, encoded-signal device (Figure 5-13). Its
front panel switches and indicators are the same as
those on the Model 754 selector.
The test initiate switch is a three-position,
momentary-contact toggle switch. In the center
position, the switch is off. The test initiate switch
is used in conjunction with the function select
push-wheel switch to perform the functions
shown in Table 5-11.
Test Initiate Switch
Figure 5-14. Model 454 Discriminator
Figure 5-13. Model 452 Discriminator
5-20
Opticom™ Infrared System
5. Phase Selectors/Discriminators
Function Select Push-Wheel Switch
The function select push-wheel switch is a 6-position
switch for Model 452 discriminators, and an
8-position switch for Model 454 discriminators. The
switch works in conjunction with the test initiate
switch to perform the functions shown in Table 5-11.
Table 5-11. Model 450 Series Discriminator Push-Wheel Switch Functions
Switch Position
A, B, C, D
Function
Priority Control Output Test—Activates the output for the selected channel and
priority. Select the desired channel via the push-wheel switch (A, B, C, or D), then
push and hold the test initiate switch to the desired priority (H or L). The selected
channel and priority output are active while the test initiate switch is held, and
remain active for 6 seconds after releasing the switch.
F
Detector Function Test—Verifies proper operation of the Model 700 series detector
connected to each channel. Set the push-wheel switch to the F position, then push
and hold the test initiate switch to the desired priority (H or L). Activate the test by
releasing the test initiate switch. Each channel with a detector(s), which passes the
test, is indicated by the associated high priority indicator flashing at a 2 Hz rate for 2
seconds.
R
Reset Parameters to Default—Resets all configurable parameters for the discriminator
to their factory settings. Set the push-wheel switch to the R position, then hold the
test initiate switch in either the H or L position while cycling the power off then on.
The test initiate switch must be held for a minimum of 2 seconds following power up
to initiate the reset to default action.
S
Set Channel and Priority Range—Sets the priority range for each channel. This
function requires the presence of a valid priority signal on the desired channel(s). Set
the push-wheel switch to the S position, then hold the test initiate switch in either the
H or L position while cycling the power off then on. The test initiate switch must be
held for a minimum of 6 seconds following power up to initiate the range setting
function. When you release the test initiate switch, the current signal intensity is the
range value stored.
blank
Not used.
Indicators
POWER LED
The POWER LED is a green LED that lights when
the power switch is set to ON and power is
applied to the discriminator. The LED flashes
during any diagnostic test.
HIGH LEDs
The HIGH LEDs are yellow LEDs, one for each
channel, that light when a High priority call is
active in a channel.
LOW LEDs
The LOW LEDs are yellow LEDs, one for each
channel, that light when a Low priority call is
active in a channel.
5-21
5. Phase Selectors/Discriminators
Opticom™ Infrared System
Table 5-13. Model 454 Discriminator
Edge Connector Wiring
Edge Connectors
The edge connector is a 44-pin STD connector
that provides all electrical connections to the
discriminator except for auxiliary detectors.
Table 5-12. Model 452 Discriminator
Edge Connector Wiring
Pin
A
D
E
F
H
J
K
L
M
N
R
V
W
X
5-22
Function
Detector ground
Channel A primary detector input
Detector 24 VDC power output
Channel A priority output, collector (+)
Channel A priority output, emitter (–)
Channel B primary detector input
Detector ground
Earth ground
AC– in (AC return)
AC+ in (115 VAC)
Detector 24 VDC power output
Detector ground
Channel B priority output, collector (+)
Channel B priority output, emitter (–)
Pin
A
D
E
F
H
J
K
L
M
N
P
R
S
T
U
V
W
X
Y
Z
Function
Detector ground
Channel A primary detector input
Detector 24 VDC power output
Channel A priority output, collector (+)
Channel A priority output, emitter (–)
Channel B primary detector input
Detector ground
Earth ground
AC– in (AC return)
AC+ in (115 VAC)
Channel C primary detector input
Detector 24 VDC power output
Channel C priority output, collector (+)
Channel C priority output, emitter (–)
Channel D primary detector input
Detector ground
Channel B priority output, collector (+)
Channel B priority output, emitter (–)
Channel D priority output, collector (+)
Channel D priority output, emitter (–)
Opticom™ Infrared System
Auxiliary Connectors (J1)
The auxiliary connector (J1) is a 44-pin connector
on the Model 450 series discriminator front panel
to which the Model 758 auxiliary interface panel
is connected.
Table 5-14. Model 452 Discriminator J1 Wiring
Pin
13
14
15
19
20
28
34
35
Function
Channel A auxiliary detector 2
input
Channel B auxiliary detector 2
input
Channel B auxiliary detector 1
input
+24 VDC detector power output
+24 VDC detector power output
Channel A auxiliary detector 1
input
Ground
Ground
Table 5-15. Model 454 Discriminator J1 Wiring
Pin
13
14
15
19
20
28
29
30
34
35
43
44
Function
Channel A auxiliary detector 2
input
Channel B auxiliary detector 2
input
Channel B auxiliary detector 1
input
+24 VDC detector power output
+24 VDC detector power output
Channel A auxiliary detector 1
input
Channel C auxiliary detector 2
input
Channel C auxiliary detector 1
input
Ground
Ground
Channel D auxiliary detector 2
input
Channel D auxiliary detector 1
input
5. Phase Selectors/Discriminators
Operational Description
Model 450 series discriminators consist of
detector signal conditioning circuits (one per
channel), a discriminator microprocessor (one
for each pair of channels), and a main
microprocessor. The discriminator also has a
power supply that converts input AC voltage to
the DC voltages necessary for discriminator and
detector operation.
Power Supply
The power supply input AC voltage is protected
with a 1 amp fuse located on the discriminator
circuit board. The power supply outputs the
following voltages: +5 VDC for the logic circuits
and +24 VDC for the detectors.
Discrimination
All inputs from detectors go to detector signal
conditioning circuits.
Each signal conditioner has three input sources:
the primary detector and two auxiliary detectors.
Primary detector inputs enter the signal
conditioner through the edge connector.
Auxiliary detector inputs are routed through
connector J1 on the discriminator’s front panel.
The discriminator microprocessor handles two
conditioned detector signals. It examines the
input signals to determine if they are valid
emitter signals, and have sufficient amplitude. If
the input signals satisfy both criteria, they are
sent to the main microprocessor.
The main microprocessor checks the validity of
the received code and checks to see if more
than one input has been received.
5-3-2.
5-23
5. Phase Selectors/Discriminators
Arbitration
If two or more discriminator inputs are active,
arbitration of the inputs occurs. The main
microprocessor examines their priority levels and
if the inputs are the same priority, it assigns
priority on a “first-come, first-served” basis.
Priority Outputs
Depending on the input priority and channel, the
microprocessor outputs either a 6.25 Hz pulse for
Low priority, or a solid low (ground) for High
priority on the proper priority output channel.
These outputs are provided to the traffic controller
and are optically isolated to protect the
discriminator and the traffic controller.
Factory Settings
Maximum Call Time: Set to 18.2 hours.
Call Hold Time: Set to 6 seconds.
Call Delay Time: Set to 0 seconds.
Non-encoded Emitters: Always recognized.
Range Code Time-out: Set to 30 minutes
immediately following power-up/reset.
Signal Intensity Threshold:
High primary detector range set to 300. High
auxiliary detector range set to 300
Low primary detector range set to 1200. Low
auxiliary detector range set to 1200
To change these settings, perform the signal
intensity threshold level adjustment described in
the Model 452/454 discriminator Installation
Instructions.
Jumper Settings (Model 452/454 Discriminator)
Maximum Call Time: Settable to 2, 4, 6 minutes,
or 18.2 hours.
Call Hold Time: Settable to 6 or 12 seconds.
Non-encoded Emitters: Settable to be recognized
or disregarded.
5-24
Opticom™ Infrared System
Opticom™ Infrared System
5. Phase Selectors/Discriminators
5-3-3. Specifications
Table 5-16. Model 450 Series Discriminator Specifications
Physical Characteristics
Height......................................... 4.5 in (11.4 cm)
Width ......................................... 1.1 in (2.8 cm) (Model 452 discriminators)
2.3 in (5.8 cm) (Model 454 discriminators)
Length......................................... Without handle 7.0 in (17.8 cm)
With handle 8.2 in (20.8 cm)
Weight ........................................ 0.53 lb (240 g) (Model 452 discriminators)
0.57 lb (260 g) (Model 454 discriminators)
Electrical Requirements
Voltage ....................................... 89 to 135 VAC, 60 Hz
Current, maximum draw ............. 300 milliamperes
Environmental Requirements
Temperature ............................... –30° to +165°F (–34° to +74°C)
Humidity, relative ....................... 5% to 95%
Operating Characteristics
Dual-priority channels ................ Two channels (Model 452 discriminators)
Four channels (Model 454 discriminators)
Priority, each discriminator
Same priority .............................. First-come, first-served
Dual priority ............................... High priority overrides Low priority
Detector Inputs
Discriminator only ...................... One primary input per channel through card edge connector
With cable harness .................... Two auxiliary inputs per channel through front panel connector
Range setting control .................. Through range-setting emitter
Solid-state indicators
Power on .................................... One green LED
High priority signal ..................... Yellow LEDs, one for each channel
Low priority signal ...................... Yellow LEDs, one for each channel
Test initiate switch ...................... Operates with function select switch to initiate selected function
Input signals
High priority ............................... 14.XXXXX Hz ± 0.XXXXX Hz
Low priority ................................ 9.XXXXX Hz ± 0.XXXXX Hz
Output signals
High priority ............................... Optically isolated NPN steady on
Low priority ................................ Optically isolated NPN pulsed wave at 6.25 Hz ± 0.02 Hz
Jumper Settings
Maximum call time ..................... Settable to 2, 4, 6 minutes, or 18.2 hours
Call hold time ............................. Settable to 6 or 12 seconds
Non-encoded emitters ................ Settable to be recognized or disregarded
5-25
5. Phase Selectors/Discriminators
Opticom™ Infrared System
Model 452 Discriminator
The Model 452 discriminator has four functional areas: detector signal conditioning circuits, discriminator
microprocessor, main microprocessor, and power supply (Figure 5-16).
Figure 5-17. Model 452 Discriminator Block Diagram
5-26
Opticom™ Infrared System
5. Phase Selectors/Discriminators
Model 454 Discriminator
The Model 454 discriminator has four functional areas: detector signal conditioning circuits, discriminator
microprocessor, main microprocessor, and power supply (Figure 5-17).
Figure 5-18. Model 454 Discriminator Block Diagram
5-27
Opticom™ Infrared System
6. Accessories
6. Accessories
This section describes the following accessories
used with the Opticom™ 700 series equipment.
•
Model 138 Detector Cable
•
Model 560 System Chassis
•
Model 755 Four-Channel Adapter
•
Model 756 Auxiliary Harness(Discontinued)
•
Model 757 Auxiliary Interface Harness
•
Model 758 Auxiliary Interface Panel
•
Model 760 Card Rack
•
Model 798 Emitter Bezel Mount Kit
•
Model 832 Communication Module
•
Reflector Lens Assembly
•
Configuration Software
6-1
6. Accessories
Opticom™ Infrared System
6-1. Model 138 Detector Cable
The Model 138 detector cable is the
recommended cable for connecting a detector to
a phase selector or discriminator. It is a shielded
cable with three conductors plus a drain wire.
The detector cable is available in 500, 1000, and
2500 foot rolls. The maximum recommended
installation length is 1000 feet.
This cable may be used in direct burial, conduit
and mast arm pull applications, and exposed
overhead installations when attached to a
messenger wire (not included).
Note:
Cable runs should not exceed 1000’ due to
signal loss.
The detector cable should not be spliced.
6-1-1. Specifications
Table 6-1. Model 138 Detector Cable Specifications
Conductor Wires
Quantity ................. 3
Gauge..................... AWG #20 (7 x 28)
Construction ........... Stranded, tinned copper
Insulation................ 0.025 inch wall minimum average low-density polyethylene meeting
the requirements of IPCEA S-61-402 and NEMA WC5, Section 7.4,
600V control cable 75°C, type B specification
Color ...................... One each: blue, yellow, and orange wires
Drain wire
Gauge..................... AWG #20 (7 x 28)
Construction ........... Individually, tinned copper, uninsulated, placed between insulated
conductor and shielding
Shield
Material .................. Mylar™ shield tape with 20% nominal overlap, conductive surface is in
contact with drain wire
Jacket
Material .................. 80°C PVC sheath
Color ...................... Black
Requirements.......... Meets IPCEA S-61-402 and NEMA WC5, Section 7.4, 600V control
cable 75°C, type B specification
Dimensions
Finished O.D. ......... 0.290 in + 0.010 in
Length .................... 500, 1000, and 2500 ft rolls
Capacitance
Capacitance (as measured from any one conductor to the other two conductors and shield)
should not exceed 48 pF per foot when tested at 1 kHz.
Marking
Cable is marked with manufacturer’s name and TYPE B/ AWG #20 (7 x 28) 600 VOLTS
75°C OPTICOM™ SYSTEM CABLE GTT M-138.
6-2
Opticom™ Infrared System
6. Accessories
6-2. Model 560 System Chassis
Input signals from the primary detectors are
connected to TB1 and TB2 on the system chassis
front panel. TB1 is wired to the X1 edge
connector, and TB2 is wired to the X2 edge
connector. Each terminal block accepts signals
from two primary detectors, one detector per
channel, for a total of four channels per system
chassis. (Auxiliary detectors connect to the front
panel of the phase selectors.)
The Model 560 system chassis (Figure 6-1)
consists of a metal enclosure designed to sit on a
shelf in the traffic controller cabinet. The
enclosure has three slots identified as X1 through
X3, from left to right. Slots X1 and X2 are for
phase selectors, and slot X3 is for an interface
card. The card slot edge connectors are factory
wired to two terminal blocks (TB1 and TB2) and
two connectors (J1 and J2) on the system chassis
front panel.
The system chassis provides a means to install
phase selectors and interface cards into a traffic
controller cabinet that does not have any input
files available. The system chassis distributes
voltage and signals between the traffic controller
and the system components.
All output signals are routed from the system
chassis edge connectors through internal wiring
to J1 and J2 on the system chassis front panel.
Figure 6-1. Model 560 System Chassis
6-3
6. Accessories
Opticom™ Infrared System
6-2-1. Wiring
Table 6-2 lists the wiring for TB1 and TB2 of the
Model 560 system chassis.
Table 6-2. Model 560 System Chassis
TB1 and TB2 Wiring
Terminal
Function
Table 6-4 lists the wiring for J2 of the Model 560
system chassis.
Table 6-4. Model 560 System Chassis J2 Wiring
Pin
Wire Color
Function
1
Orange
Varies by card
2
Yellow
Varies by card
TB1-1
Channel A primary detector input
3
Yellow/Brown
Varies by card
TB1-2
Channel B primary detector input
4
White/Black
Varies by card
TB1-3
Detector power
5
White/Blue
Varies by card
TB1-4
Detector ground
6
Yellow/Orange
Varies by card
TB2-1
Channel C primary detector input
7
Yellow/Green
Varies by card
TB2-2
Channel D primary detector input
8
White/Brown
Varies by card
TB2-3
Detector power
9
Yellow/Blue
Varies by card
TB2-4
Detector ground
10
White/Red
Varies by card
11
Blue
Varies by card
Table 6-3 lists the wiring for J1 of the Model 560
system chassis.
12
Yellow/Black
Varies by card
13
Brown
Varies by card
Table 6-3. Model 560 System Chassis J1 Wiring
14
Yellow/Gray
Varies by card
15
Yellow/White
Varies by card
16
Violet
Varies by card
17
White/Gray
Varies by card
18
White
Varies by card
19
White/Orange
Varies by card
20
Yellow/red
Varies by card
21
White/Violet
Varies by card
22
White/Green
Varies by card
23
Gray
Varies by card
24
Yellow/Violet
Varies by card
25
White/Yellow
Varies by card
Pin
6-4
Function
1
AC+ in (115 VAC)
2
AC− in (AC return)
3
Chassis ground
4
Logic ground
5
Channel B priority output
6
Channel A priority output
7
Channel D priority output
8
Channel C priority output
26
No connection
27
No connection
28
No connection
Opticom™ Infrared System
Table 6-5 lists the wiring for edge connector X1
of the Model 560 system chassis.
Table 6-5. Model 560 System Chassis X1 Wiring
Pin
Function
D&4
Channel A primary detector input
E&5
Detector 24 VDC power output
F&6
Channel A priority output, collector
(+)
H&7
Channel A priority output, emitter (–),
logic ground
J&8
Channel B primary detector input
K&9
Detector DC ground
L & 10
Chassis ground
M & 11
AC– in (AC return)
N & 12
AC+ in (115 VAC)
W & 19
Channel B priority output, collector
(+)
X & 20
Channel B priority output, emitter (–),
logic ground
Table 6-6 lists the wiring for edge connector X2
of the Model 560 system chassis.
Table 6-6. Model 560 System Chassis X2 Wiring
Pin
Function
D&4
Channel C primary detector input
E&5
Detector 24 VDC power output
F&6
Channel C priority output, collector
(+)
H&7
Channel C priority output, emitter (–),
logic ground
J&8
Channel D primary detector input
K&9
Detector DC ground
L & 10
Chassis ground
M & 11
AC– in (AC return)
N & 12
AC+ in (115 VAC)
W & 19
Channel D priority output, collector
(+)
X & 20
Channel D priority output, emitter (–),
logic ground
6. Accessories
Table 6-7 lists the wiring for edge connector X3
of the Model 560 system chassis.
Table 6-7. Model 560 System Chassis X3
Wiring
Pin
A
B
C
D
E
F
H
J
K
L
M
N
P
R
S
T
U
V
W
X
Y&Z
1
2
3
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Function
Connection to J2-25
Connection to J2-12
Channel C call input
Channel A call input
Connection to J2-8
Connection to J2-3
Connection to J2-2
Channel B call input
Logic ground
Chassis ground
AC– in (AC return)
AC+ in (115 VAC)
Connection to J2-11
Connection to J2-5
Connection to J2-9
Connection to J2-15
Connection to J2-22
Channel D call input
Connection to J2-10
Connection to J2-19
Connection to J2-13
Connection to J2-24
Connection to J2-20
Connection to J2-14
Connection to J2-7
Connection to J2-6
No connection
No connection
No connection
No connection
No connection
No connection
Connection to J2-1
Connection to J2-4
Connection to J2-16
Connection to J2-21
Connection to J2-23
Connection to J2-18
Connection to J2-17
6-5
6. Accessories
6-2-2. Specifications
Table 6-8. Model 560 System Chassis Specifications
Physical Characteristics
Height ....................... 8.44 in (21.4 cm)
Width ........................ 4.10 in (10.4 cm)
Depth ........................ 8.25 in (21 cm)
Shipping weight ......... 5.4 lb (2.4 kg)
Environmental Requirements
Temperature .............. –30 to +140 F
(–34 to +60 C)
Humidity, relative ...... 5% to 95%
Interface Connections
Phase selector ............ 1 or 2 module connectors
Interface card ............ 1 card connector
Internal wiring ........... Connects phase selectors
and interface card
connectors to front panel
jacks
Front panel terminal .. Connects detector inputs
and detector power from
detector cables to system
chassis
6-6
Opticom™ Infrared System
Opticom™ Infrared System
6-3. Model 755 Four-Channel Adapter
Card
The Model 755 four-channel adapter card
(Figure 6-2) consists of a plug-in circuit board
and a ribbon cable.
This adapter card is used to upgrade from
two 2-channel phase selectors to one 4channel phase selector. The adapter card
allows the installation of a 4-channel phase
selector into a Model 560 system chassis or
an input file/card rack that is wired for two
2-channel phase selectors. The Model 755
four-channel adapter card and ribbon cable
provide the cross wiring required so that all
four detector inputs are directed to the 4channel phase selector.
6-3-1.
6. Accessories
Specifications
Table 6-9. Model 755 Four-Channel Adapter
Specifications
Physical Characteristics
Height ....................... 4.5 in (11.5 cm)
Width ........................ 0.5 in (1.3 cm)
Length ....................... 4.0 in (10.2 cm)
Weight....................... 0.06 lb (30 g)
Cable length .............. 12 in (30.5 cm)
Environmental Requirements
Temperature .............. –35 to +165 F
(–37 to +74 C)
Humidity, relative ...... 5% to 95%
Interface Connections
Ribbon cable ............. Connects to gray rectangular
socket on 4-channel phase
selector
Adapter card .............. Plugs into card edge
connector
Figure 6-2. Model 755 Four-Channel Adapter Card
6-7
6. Accessories
Opticom™ Infrared System
6-4. Model 756 Auxiliary Harness
(Discontinued)
The Model 756 auxiliary harness (Figure 63) consists of two 15-pin connectors wired
to a 44-pin connector.
The Model 756 auxiliary harness allows the
use of existing Model 562 phase selector
wiring when upgrading to a Model 752 or 754
phase selector. By using the auxiliary harness,
existing wiring connections for green sense
and auxiliary detectors can be used.
The auxiliary harness allows you to connect one
or two Model 562 phase selector wiring
harnesses to either a Model 752 or 754 phase
selector.
To use the Model 756 auxiliary harness, plug
the 44-pin connector into connector J1 on the
Model 752 or 754 phase selector. Plug the 15pin connector with 13 pins into the existing
Model 562 phase selector wiring harness
connector designated for channels A and B. Plug
the 15-pin connector with 4 pins into the
existing wiring harness connector designated for
channels C and D.
Figure 6-3. Model 756 Auxiliary Harness
6-8
Opticom™ Infrared System
6. Accessories
6-4-1. Wiring
Table 6-10 lists the connector wiring for the Model 756 auxiliary harness.
Table 6-10. Model 756 Auxiliary Harness Connector Wiring
15 Pin #1
44 Pin
15 Pin #2
Function
1
1
Phase 1 green input (AC+)
2
2
Phase 2 green input (AC+)
3
3
Phase 3 green input (AC+)
4
16
Phase 4 green input (AC+)
5
17
Phase 5 green input (AC+)
6
18
Phase 6 green input (AC+)
7
31
Phase 7 green input (AC+)
8
32
Phase 8 green input (AC+)
15
33
AC common (green sense)
9
28
Channel A auxiliary detector 1 input
10
13
Channel A auxiliary detector 2 input
11
15
Channel B auxiliary detector 1 input
12
14
Channel B auxiliary detector 2 input
30
9
Channel C auxiliary detector 1 input
29
10
Channel C auxiliary detector 2 input
44
11
Channel D auxiliary detector 1 input
43
12
Channel D auxiliary detector 2 input
Environmental Requirements
6-4-2. Specifications
Table 6-11. Model 756 Auxiliary Harness
Specifications
Physical Characteristics
44-pin connector
Height ...................... 2.1 in (5.3 cm)
Width ....................... 0.75 in (1.9 cm)
Length ...................... 1.75 in (4.4 cm)
15-pin connectors
Height ...................... 1.5 in (3.8 cm)
Width ....................... 0.68 in (1.7 cm)
Length ...................... 1.75 in (4.4 cm)
Auxiliary harness
Overall length ........... 6.75 in (17.1 cm)
Temperature .............. –35 to +165 F
(–37 to +74 C)
Humidity, relative ...... 5% to 95%
Interface Connections
44-pin connector ....... Connects to J1 on Model
752/754 phase selector
15-pin connector #1 .. Connects to existing harness
from Model 562 phase
selector (green sense,
channel A & B auxiliary
detector input)
15-pin connector #2 .. Connects to existing harness
from Model 562 phase
selector (channel C & D
auxiliary detector input)
6-9
6. Accessories
Opticom™ Infrared System
6-5. Model 757 Auxiliary Interface Harness
The Model 757 auxiliary interface harness
(Figure 6-4) is a 12-foot cable that consists of
a 44-pin connector with 17 unterminated
wires.
The auxiliary harness provides a breakout of
connector J1 on the Model 752 and 754 phase
selectors. This breakout provides connection
points for auxiliary detector inputs and green
sense inputs.
For detector wiring, connect the proper wires
from the harness to an unused terminal block in
the traffic controller cabinet. See Table 6-12 to
select the proper wires. Then connect the
corresponding wires from the detector cable to
the same terminal block.
For green sense wiring, connect the proper wires
from the auxiliary harness directly to the green
sense wiring points in the load bay of the traffic
controller cabinet.
To use the Model 757 auxiliary harness,
plug the 44-pin connector into connector
J1 on the Model 752 or 754 phase selector.
Figure 6-4. Model 757 Auxiliary Harness
6-10
Opticom™ Infrared System
The auxiliary harness is shipped with the wires
exiting straight out the back of the connector
housing as shown in Figure 6-5. If this
configuration causes interference problems, it is
possible to reconfigure the connector so that the
wires exit from the bottom of the connector.
To change the connector housing so that the wires
exit out the bottom, perform the following steps:
1. Remove the screws and open the cover.
2. Lift the wiring harness away from the connector
housing.
6. Accessories
3. Swap positions of the strain relief and blank
insert. See Figure 6-6.
4. Bend the wiring harness and place it in the
connector housing so that the wires exit the
bottom as shown in Figure 6-6. Make sure
that all of the wires are contained in the
strain relief and are not being pinched by
the connector cover.
5. Close the cover and secure it to the base
with the screws removed in step 1.
Figure 6-5. Wires Exit Back of Connector Housing
Figure 6-6. Wire Exit Bottom of Connector Housing
6-11
6. Accessories
Opticom™ Infrared System
6-5-1. Wiring
Table 6-12 lists the connector wiring for the Model 757 auxiliary harness.
Table 6-12. Model 757 Auxiliary Harness Connector Wiring
Pin
Wire Color
Function
1
Black/Brown
Phase 1 green input (AC+)
2
Black/Blue
Phase 2 green input (AC+)
3
Black/White
Phase 3 green input (AC+)
4
Gray/Black
Logic Ground
7
Blue
Channel B low output (solid) *
13
Yellow/Blue
Channel A auxiliary detector 2 input
14
Yellow/White
Channel B auxiliary detector 2 input
15
Yellow/Black
Channel B auxiliary detector 1 input
16
Black/Red
Phase 4 green input (AC+)
17
Black/Yellow
Phase 5 green input (AC+)
18
Black/Green
Phase 6 green input (AC+)
21
Brown
Channel D low output (solid) *
22
Violet
Channel C low output (solid) *
23
Gray
Channel A low output (solid) *
28
Yellow/Brown
Channel A auxiliary detector 1 input
29
Yellow/Orange
Channel C auxiliary detector 2 input
30
Yellow/Green
Channel C auxiliary detector 1 input
31
Black/Violet
Phase 7 green input (AC+)
32
Black/Orange
Phase 8 green input (AC+)
33
White
AC common (green sense)
43
Yellow/Violet
Channel D auxiliary detector 2 input
44
Yellow/Gray
Channel D auxiliary detector 1 input
*This output is only available with a 752N or 754N set to High Only on Back output mode.
6-2
Opticom™ Infrared System
6. Accessories
6-5-2. Specifications
Table 6-13. Model 757 Auxiliary Harness Specifications
Physical Characteristics
44-pin connector
Height ............................. 1.75 in (4.4 cm)
Width .............................. 0.75 in (1.9 cm)
Length ............................. 2.0 in (5.1 cm)
Cable length .................... 12.0 ft (3.7 m)
Environmental Requirements
Temperature .................... –35 to +165 F (–37 to +74 C)
Humidity, relative ............ 5% to 95%
Interface Connections
44-pin connector ............. Connects to J1 on Model 450 & 750 series phase
selectors
Unterminated wires ......... Connect to terminal block in traffic controller
cabinet
6-3
6. Accessories
Opticom™ Infrared System
6-6. Model 758 Auxiliary Interface Panel
The Model 758 auxiliary interface panel (Figure 67) consists of a circuit board with two terminal
blocks (TB1 and TB2) and a 44-pin connector (J1).
The interface panel is a terminal block assembly
designed for easy connections between a 700
series phase selector or a 400 series
discriminator and the traffic controller cabinet
wiring. The interface panel includes a mounting
plate for attaching the panel to the wall of a
traffic controller cabinet. A 12-foot cable
connects the interface panel to connector J1 on
the front of the phase selector or discriminator.
This assembly is recommended for installations
using auxiliary detectors and green sense, and is
required for the following:
•
Installations with confirmation lights.
•
Installations needing steady low, low priority
outputs.
•
Installations with Manual control signals.
Figure 6-7. Model 758 Auxiliary Interface Panel
6-4
Opticom™ Infrared System
6-6-1. Wiring
Table 6-14 lists the wiring for TB1 of the Model
758 auxiliary interface panel.
Table 6-14. Model 758 Auxiliary Interface
Panel
TB1 Wiring
6. Accessories
Table 6-15 lists the wiring for TB2 of the Model
758 auxiliary interface panel.
Table 6-15. Model 758 Auxiliary Interface
Panel
TB2 Wiring
TB2
Function
TB1
Function
1
Confirmation light 1 output
1
Phase 1 green input (AC+)
2
Confirmation light 2 output
2
Phase 2 green input (AC+)
3
Confirmation light 3 output
3
Phase 3 green input (AC+)
4
Confirmation light 4 output
4
Phase 4 green input (AC+)
5
Channel A auxiliary detector 1 input
5
Phase 5 green input (AC+)
6
Channel A auxiliary detector 2 input
6
Phase 6 green input (AC+)
7
Channel B auxiliary detector 1 input
7
Phase 7 green input (AC+)
8
Channel B auxiliary detector 2 input
8
Phase 8 green input (AC+)
9
Channel C auxiliary detector 1 input
9
AC common input (green sense)
10
Channel C auxiliary detector 2 input
10
Phase 1 omit output (Ch. A low)
11
Channel D auxiliary detector 1 input
11
Phase 2 omit output (Ch. B low)
12
Channel D auxiliary detector 2 input
12
Phase 3 omit output (Ch. C low)
13
Detector power ground output
13
Phase 4 omit output (Ch. D low)
14
Detector power ground output
14
Phase 5 omit output
15
Not used
15
Phase 6 omit output
16
24 VDC detector power output
16
Phase 7 omit output
17
24 VDC detector power output
17
Phase 8 omit output
18
Not used
18
Manual control enable output
19
OPTO common input
19
Disable input
20
OPTO common input
20
Free signal output
21
Not used
21
Coordination isolation output
22
Controller +24 VDC input
22
Interval advance output
6-5
6. Accessories
Opticom™ Infrared System
6-6-2. Specifications
Table 6-16. Model 758 Auxiliary Interface Panel Specifications
Physical Characteristics
Auxiliary interface
panel
Height .............................
Width ..............................
Length .............................
Weight ............................
1.25 in (3.2 cm)
4.5 in (11.4 cm)
7.25 in (18.4 cm)
0.5 lb (230 g)
Cable length .................... 12.0 ft (3.7 m)
Environmental Requirements
Temperature .................... –35 to +165 F
(–37 to +74 C)
Humidity, relative ............ 5% to 95%
Interface Connections
Interface panel cable ....... Connects auxiliary interface panel to
Model 450 & 750 series phase selector or
discriminator
Terminal blocks ............... Connection points for green sense, auxiliary
detectors, confirmation lights, phase omits,
etc. from auxiliary interface panel to traffic
controller cabinet wiring. Terminals accept 22
to 16 AWG wires.
6-6
Opticom™ Infrared System
6-7. Model 760 Card Rack
The Model 760 card rack (Figure 6-8) consists of
a metal enclosure designed to sit on a shelf in the
traffic controller cabinet. The enclosure has one
slot and a card edge connector that accepts a
phase selector or discriminator. The card edge
connector is factory wired to a terminal block on
the front panel, which provides a connection
point for the primary detector inputs. The edge
connector is also wired to a 9-pin connector (J1),
which provides a connection point for the
priority control outputs and the 115 VAC input.
A 6-foot long, 9-pin wiring harness connects this
connector to the controller terminals.
6. Accessories
The card rack provides a means to install a
Model 752/754/752N/754N phase selector or a
Model 452/454 discriminator into a traffic
controller cabinet that does not have any input
files available. The card rack provides the power
and logic wiring for the phase
selector/discriminator, and also provides a
means to connect the phase
selector/discriminator to the detectors and to the
traffic controller terminals.
Figure 6-8. Model 760 Card Rack and 9-Pin Harness
6-7
6. Accessories
Opticom™ Infrared System
6-7-1. Wiring
Table 6-17 lists the edge connector wiring for the
Model 760 card rack.
Table 6-18. Model 760 Card Rack TB1 Wiring
Table 6-17. Model 760 Card Rack
Edge Connector Wiring
TB1
1
Channel A primary detector input
Function
2
Channel B primary detector input
Pin
6-8
Table 6-18 lists the wiring for TB1 of the Model
760 card rack.
Function
A
Detector ground
3
Channel C primary detector input
B
Not used
4
Channel D primary detector input
C
Not used
5
Detector 24 VDC power output
D
Channel A primary detector input
6
Detector 24 VDC power output
E
Detector 24 VDC power output
7
Detector ground
F
Channel A priority output, collector
(+)
8
Detector ground
H
Channel A priority output, emitter (–)
J
Channel B primary detector input
K
Detector ground
L
Earth ground
M
AC– in (AC return)
Pin
N
AC+ in (115 VAC)
1
AC+ in (115 VAC)
P
Channel C primary detector input
2
AC– in (AC return)
R
Detector 24 VDC power output
3
Chassis ground
S
Channel C priority output, collector
(+)
4
Not used
T
Channel C priority output, emitter (–)
5
Channel A priority output
U
Channel D primary detector input
6
Channel B priority output
V
Detector ground
7
Channel C priority output
W
Channel B priority output, collector
(+)
8
Channel D priority output
9
Logic ground
X
Channel B priority output, emitter (–)
Y
Channel D priority output, collector
(+)
Z
Channel D priority output, emitter (–)
19
TXD (transmit data)
21
RXD (receive data)
Table 6-19 lists the connector wiring for the 9pin harness.
Table 6-19. 9-Pin Harness Connector Wiring
Function
Opticom™ Infrared System
6. Accessories
6-7-2. Specifications
Table 6-20. Model 760 Card Rack Specifications
Physical Characteristics
Height ...................... 5.25 in (13.3 cm)
Width ....................... 5.25 in (13.3 cm)
Depth ....................... 8.5 in (21.6 cm)
Weight ...................... 1.37 lb (620 g)
Environmental Requirements
Temperature ............. –30 to +165 F
(–34 to +74 C)
Humidity, relative ..... 5% to 95%
Interface Connections
Phase selector/
Discriminator ............ One module connector
Internal wiring .......... Connects edge connector to
front panel jack and terminal
block
Front panel jack ........ Connects priority control
outputs from card rack to
controller cabinet
Front panel terminal . Connects detector inputs
and detector power from
detector cables to card rack
6-9
6. Accessories
Opticom™ Infrared System
6-8. Model 798 Emitter Bezel Mount Kit
The Model 798 emitter bezel mount kit (Figure
6-9) consists of a metal bezel, with mounting
hardware, and two gaskets.
The Model 798 emitter bezel mount kit is
intended to panel mount Model 792 and Model
492 series emitters on the front, vertical surface
of a vehicle. The emitter bezel is not compatible
with other models of emitters.
6-8-1.
Specifications
Table 6-21. Model 798 Emitter Bezel Mount
Kit Specifications
Physical Characteristics
Height ....................... 4.5 in (11.5 cm)
Width ........................ 6.0 in (15.3 cm)
Depth ........................ 0.125 in (0.32 cm)
Weight ...................... 0.3 lb (136 g)
Environmental Requirements
Temperature .............. –35 to +165 F
(–37 to +74 C)
Humidity, relative...... 5% to 95%
Figure 6-9. Model 798 Emitter Bezel Mount Kit
6-10
Opticom™ Infrared System
6. Accessories
6-9. Series 492/792 Reflector/Lens
Assembly
The Series 492/792 Reflector/Lens Assembly
(Figure 6-10) is a /reflector/strobe assembly that
replaces the clear lens/reflector/strobe assembly
of a Model 792 or Model 492 series emitter with
a filtered assembly or vice-versa. It may also be
used to replace a lens assembly.
Figure 6-10. Series 492/792 Reflector Lens Assembly
6-9-1. Specifications
Table 6-22. Series 492/792 Reflector Lens
Assembly Specifications
Physical Characteristics
Height ...................... 3.0 in (7.6 cm)
Width ....................... 4.5 in (11.5 cm)
Depth ........................ 3.0 in (7.6 cm)
Weight....................... 0.4 lb (181 g)
Environmental Requirements
Temperature .............. –35 to +165 F
(–37 to +74 C)
Humidity, relative ...... 5% to 95%
6-11
6. Accessories
Opticom™ Infrared System
6-10. Model 832 Communication Module
The optional Model 832 communication module
(Figure 6-12) is a plug-in communication
interface board. This module plugs directly into a
Model 750 series phase selector.
The Model 832 communication module may be
added to enhance the communication capabilities
of the phase selector. This module adds separate
card edge communication port capabilities to the
phase selector, which doubles the number of
communication ports from one to two. This
addition is convenient for applications where both
system communication (through the card edge
communication port) and local communication
(through the front panel communication port) are
desirable concurrently.
With a Model 832 communication module
installed, you can set independent
communication baud rates between the front
and rear serial ports of the phase selector using
750 series configuration software (750-CS).
Baud rates may be set to 1200, 2400, 4800, or
9600 bps. The default baud rate for both the
front and rear serial ports is 9600 bps.
In addition, communication modules enable
you to configure terminator resistor jumpers that
allow up to 32 phase selectors to share the same
RS-232 communication line. Figure 6-13 shows
the location of these jumpers.
Both the front and rear communication ports
must be properly terminated. For details about
terminating the front and rear communication
ports, refer to the Model 750 series phase
selector Installation Instructions.
Figure 6-12. Model 832 Communication Module
6-12
Opticom™ Infrared System
6. Accessories
Figure 6-13. Rear Communication Port Terminator Resistor Jumpers
6-10-1. Specifications
Table 6-24. Model 832 Communication Module
Specifications
Physical Characteristics
Height ...................... 0.75 in (1.9 cm)
Width ....................... 0.75 in (1.9 cm)
Length ...................... 2.0 in (5.1 cm)
Weight ...................... 0.01 lb (6 g)
Environmental Requirements
Temperature ............. –35 to +165 F
(–37 to +74 C)
Humidity, relative ..... 5% to 95%
Interface Connections
Communication
module ..................... Plugs into 750 series phase
selector. See Figure 6-10.
6-13
6. Accessories
6-11. Interface Software
Opticom™ 700 series equipment with
communication capabilities, such as emitters and
phase selectors, can be programmed via the
appropriate interface software. The device to be
programmed must be connected to a PCcompatible computer via the proper
communication cables and adapters.
6-11-1. ITS Link
ITS Link is the program used to launch all Global
Traffic Technologies interface software applets.
The ITS Link program allows you to work with
one applet and one device at a time for the
purpose of configuring the device or acquiring
information from the device. Instructions for
using the ITS Link program are provided in
online help and in the User Guide that comes
with the program.
6-11-2. 790 Series Configuration Software
(790-CS)
The 790 series configuration software (790-CS) is
a configuration and diagnostic tool intended for
use with all Model 792 series emitters. This
interface software is an applet that runs under the
ITS Link program. Instructions for using this
interface software are provided in the online 790
series interface software (790-CS) Help File.
6-11-3. 750 Series Configuration Software
(750-CS)
The 750 series configuration software (750-CS) is
a configuration, diagnostic, and data collection
tool intended for use with all Model 750 series
phase selectors. This interface software is an
applet that runs under the ITS Link program.
Instructions for using this interface software are
provided in the online 750 series configuration
software (750-CS) Help File.
6-14
Opticom™ Infrared System
Opticom™ Infrared System
7. Maintenance
7. Maintenance
Emitters
The Opticom™ 700 series system components
are designed for reliable operation. Inspect the
components at regular intervals to ensure proper
system operation.
Clean and inspect emitters when required, as
determined by observation, but no less
frequently than every 12 months. Accumulation
of dust, dirt, mud, road-spray, bugs or other
materials on the lens should be removed
immediately. Wet the lens with soapy water and
wash it with a soft cloth. Rinse with clean water
and allow it to air dry.
GTT recommends that all detectors be cleaned
and inspected at least every 12 months. We also
recommend that each intersection and vehicle
system be inspected and tested at least every 12
months to ensure that it functions to your
specifications and requirements. Intersection
systems should be tested with known good
emitters. Similarly, vehicle-based emitter systems
should be tested with known good intersection
systems.
You should develop a test plan that both fits your
department’s operations and meets the needs of
your system. We recommend that you keep
accurate and up-to-date records of system
performance and test results.
7-1. Preventive Maintenance
Preventive maintenance consists of cleaning,
inspecting, and testing the system components.
7-1-1.
1. Carefully inspect the lens and the entire
emitter assembly daily or at intervals you
believe to be adequate. If any defects are
detected in the emitter assembly, arrange to
have it repaired or replaced.
2. Test the emitter each day to be sure that it
functions properly. Stand off to the side of
the emitter and observe the reflected light.
The flash pattern of an encoded emitter can
be observed in this manner. All Model 792
and 492 series emitters include selfdiagnostic circuits that provide a visible
output through the indicator light in the
emitter on/off switch. The indicator flashes at
the rate of 2 Hz if faults are detected. The
indicator flashes at the rate of 0.5 Hz if the
emitter is disabled by the disable switch.
7-1-2. Detectors
Clean and inspect detectors when required, as
determined by observation, but no less
frequently than every 12 months. Accumulation
of dust, dirt, mud, road-spray, bugs or other
materials on the lens should be removed
immediately. Wet the lens with soapy water and
wash it with a soft cloth. Rinse with clean water
and allow it to air dry.
Verify that the detector is aimed in the
appropriate direction. Re-align improperly aimed
detectors and tighten the mountings. Test all realigned detectors with an emitter-equipped
vehicle and your established test procedure.
7-1
7. Maintenance
Opticom™ Infrared System
7-1-3. Phase Selectors/Discriminators
System Maintenance
Test each phase selector/discriminator as
outlined below:
GTT recommends testing all intersections at
regular intervals that you find to be appropriate
for your system, but no less frequently than every
12 months.
1. Set the push-wheel switch to channel A.
Hold the test initiate switch up. The
controller should recognize a channel A
High priority request (the channel A HIGH
LED will light). Release the test switch.
2. If the controller does not recognize the High
priority request, substitute a spare unit into
the system and re-test.
1. Locate an emitter-equipped vehicle within
the range set for the intersection approach to
be tested.
2. Wait until the signal light turns yellow, then
turn on the emitter.
If the problem persists with the spare unit,
the problem may be in the wiring from the
phase selector/discriminator/system chassis
or the traffic control system.
3. The desired green should be delivered. If it is
not, please refer to the Troubleshooting
section of this manual.
If the phase selector/discriminator is the
problem, return it to 3M for repair.
4. If this approach to the intersection functions
correctly, test the remaining approaches to
the intersection.
3. In a dual-priority system, hold the test initiate
switch down. The controller should
recognize a channel A Low priority request
(the channel A LOW LED will light). Release
the test switch.
4. If the controller does not recognize the Low
priority request, substitute a spare unit into
the system and re-test.
If the problem persists with the spare unit,
the problem may be in the wiring from the
phase selector/discriminator/system chassis
or the traffic control system.
If the phase selector/discriminator is the
problem, return it to GTT for repair.
5. Repeat steps 1 through 4 for channel(s)
B (C and D on four-channel phase
selectors/ discriminators) setting the
push-wheel switch to B (C and D,
respectively).
Note
For Model 750 series phase selectors,
more extensive tests are available by
using 750 series configuration
software (750-CS).
7-2.
7-2
Use the following steps to test an intersection:
5. Repeat steps 1 through 4 for each
intersection to be tested.
Opticom™ Infrared System
8. Troubleshooting
The following table lists various symptoms and
indications of system problems. It also shows the
possible causes of the problems and suggests
solutions to correct them.
Symptom/Indication
Emitter does not
flash when it is
turned on.
Emitter flashes, but
very slowly.
Emitter will not
place a call.
Possible Cause
8. Troubleshooting
For technical support, please call the GTT
Technical Service department at 1-800-2584610.
Solution
Disable function is active.
If the indicator light in the on/off switch is flashing
every other second (0.5 Hz), the disable function is
active. Deactivate the disable function and retest.
Emitter may have failed.
If the indicator light in the on/off switch is flashing
two times per second (2 Hz), replace the emitter.
For Model 792 series emitters, be sure to set the
disable function and the vehicle class and
identification codes in the new emitter using 790
series configuration software (790-CS). Return the
unit to GTT for service.
Fuse blown.
Check the emitter fuse. Replace the fuse and retest.
Wiring incorrect.
Check all wiring, including the emitter control
switch module, and re-seat all system connectors.
Emitter control switch
module may have failed.
Replace the emitter control switch module and
retest. Return the unit to GTT for service.
Low current/voltage.
Emitter may not be getting enough current. Ensure
that the correct installation cable was used, that all
connections are clean, tight, and connected to the
battery where specified in the Installation
Instructions, and that the vehicle battery voltage is
correct.
Emitter may have failed.
Replace the emitter. For Model 792 series emitters,
be sure to set the disable function and the vehicle
class and identification codes in the new emitter
using 790 series configuration software (790-CS).
Return the unit to GTT for service.
Emitter control switch
module may have failed.
Replace the emitter control switch module and
retest. Return the unit to GTT for service.
Dirty emitter lens.
Clean the emitter lens.
Emitter out of alignment or
obstructed.
Ensure the emitter is level, pointed forward, and
not obstructed.
Emitter encoded
incorrectly.
Ensure the emitter is encoded with a valid vehicle
class number, identification number, and priority
level.
Emitter out of range.
Determine if the phase selector can detect the
emitter signal.
8-1
8. Troubleshooting
Symptom/Indication
Opticom™ Infrared System
Possible Cause
Solution
Emitter may have failed.
Replace the emitter. For Model 792 series emitters,
be sure to set the disable function and the vehicle
class and identification codes in the new emitter
using 790 series configuration software (790-CS).
Return the unit to GTT for service.
Phase selector or
discriminator
POWER LED and all
channel LEDs are on
steady.
Phase selector or
discriminator may have
failed.
Replace the phase selector/discriminator. Return
the unit to GTT for service.
Phase selector or
discriminator
POWER LED will not
light.
Fuse blown.
Check all phase selector/discriminator on/off
switches and fuses. Replace the fuse with Littlefuse
P/N R451000 (1 Amp, 125 VAC). See Figure 5-5 for
fuse location.
If fuses continue to fail, replace the phase selector/
discriminator. Return the unit to GTT for service.
Wiring incorrect.
Check controller cabinet AC power. Set a
multimeter to read 120 VAC. Check between pins
M and N at the phase selector/discriminator edge
connector. If there is no 115 VAC, check the wiring
and the controller cabinet circuit breakers. Restore
controller cabinet AC and retest.
Phase
selector/discriminator may
have failed.
Initiate a High priority test call on channel A of a
phase selector/discriminator by setting the pushwheel switch to A and holding the test switch in
the up position. If the call LED does not light,
replace the phase selector/discriminator.
Phase selector or
discriminator
POWER LED is lit,
but call LEDs will
not light.
If the call LED does light, repeat the test with a Low
priority test call on channel A by holding the test
switch in the down position. If the call LED does
not light, replace the phase selector/ discriminator.
If the call LED does light, repeat the above tests
with channel B. For four-channel phase selectors/
discriminators, also repeat the above tests with
channels C and D.
Check the detector noise levels using 750 series
configuration software (750-CS) s/b be varying
between about 10-35.
CA/NY type 170 controller
has no +24 VDC from
phase
selector/discriminator to
detector.
Set a multimeter to read at least 30 VDC.
Disconnect the orange detector wire from pin E of
the card slot connector and measure the voltage
between pin E and pin K. Replace the phase
selector/discriminator if the voltage is less than 20
VDC. Reconnect the orange detector wire. Return
the unit to GTT for service.
Repeat the above test for additional phase
selectors/ discriminators.
8-2
Opticom™ Infrared System
Symptom/Indication
Phase selector or
discriminator
POWER LED is lit,
but call LEDs will
not light.
(Continued)
Possible Cause
8. Troubleshooting
Solution
Model 560 system chassis
has no +24 VDC from
phase
selector/discriminator to
detector.
Set a multimeter to read at least 30 VDC.
Disconnect the orange detector wire from TB1-3
(or TB2-3) and measure the voltage between TB13 and TB1-4 (or TB2-3 and TB2-4). Replace the
phase selector/ discriminator if the voltage is less
than 20 VDC. Reconnect the orange detector
wire. Return the unit to GTT for service.
Model 760 card rack has
no +24 VDC from phase
selector/discriminator to
detector.
Set a multimeter to read at least 30 VDC.
Disconnect the orange detector wire from TB1-5
(or TB1-6) and measure the voltage between TB15 and TB1-7 (or TB1-6 and TB1-8). Replace the
phase selector/ discriminator if the voltage is less
than 20 VDC. Reconnect the orange detector
wire. Return the unit to GTT for service.
Model 758 auxiliary
interface panel has no +24
VDC from phase
selector/discriminator/
interface panel to detector.
Set a multimeter to read at least 30 VDC.
Disconnect the orange detector wire(s) from the
terminal(s) labeled DET PWR OUT and measure
the voltage between DET PWR OUT and DET PWR
GND. Replace the phase selector/discriminator if
the voltage is less than 20 VDC. Reconnect the
orange detector wire(s). Return the unit to GTT for
service.
Short in detector(s) or
wiring.
Pull the phase selectors/discriminators out of their
card slot connectors and measure the resistance
between all combinations of detector wires. A
resistance reading of less than 500 ohms between
any two wires indicates a short either in the
detector(s) or in the wiring between the detector(s)
and the traffic controller. If the detector has a short,
replace the detector and try again. Return the unit
to GTT for service.
No DC voltage to
detector(s).
Check for +24 VDC at the detector(s), measuring
between the orange wire and ground. Verify that
all detector connections are wired correctly.
Detector dirty or improper
alignment.
Make sure the detector(s) are clean, level, aligned
correctly, and have an unobstructed view of the
intersection approach.
8-3
8. Troubleshooting
Symptom/Indication
Opticom™ Infrared System
Possible Cause
Open wire or detector may
have failed.
Solution
Pull the phase selector/discriminator for the suspect
detector out of its slot. If auxiliary detectors will be
checked, disconnect the auxiliary interface panel
cable connector P1. Leave the cable unplugged
until the problem is corrected.
Remove all of the wires from the suspect detector
and tie (short) them together.
Check for continuity between all combinations of
two detector input wires at the phase
selector/discriminator for primary detectors, or at
the auxiliary interface panel for auxiliary detectors.
If an open wire is found, repair the wire and
recheck continuity. If there is no open wire,
replace the detector and try again. Return the unit
to GTT for service.
Phase selector or
discriminator call
LEDs light, but
intersection will not
acknowledge signal.
Incorrect wiring.
Verify that the phase selector/discriminator call
outputs are wired to the correct preemption
controller inputs. If the phase selector/discriminator
call outputs are not correct, replace the phase
selector/ discriminator and retest. Return the unit to
GTT for service.
Incorrectly programmed
controller.
If the phase selector/discriminator call outputs are
correct, verify that the traffic controller is
programmed correctly and is detecting inputs.
Set a multimeter to read at least 30 VDC. Connect
the meter between the preemption common and
the preemption input associated with the call. With
no call present, the voltage should read
approximately +24 VDC. When a High priority call
is placed, the voltage should drop to near 0 VDC.
When a Low priority call is placed, the voltage
should oscillate at 6.25 Hz between 0 VDC and
+24 VDC. A digital meter may not display this
pulsating signal as well as an analog meter.
Green terminates
before priority
vehicle clears the
intersection.
Improper phase selector
programming.
Reprogram the phase selector’s Call Hold Time
using 750 series configuration software (750-CS). If
the Call Hold Time is too short, increase it and test
the intersection again.
If the Call Hold Time cannot be adjusted, or the
green still cuts off too soon after adjusting it,
replace the phase selector and try again. Return the
unit to GTT for service.
Discriminator’s Call Hold
Time set to 6 seconds.
8-4
For Model 450 series discriminators, set the
discriminator’s Call Hold Time parameter to 12
seconds. If the green still cuts off too soon, replace
the discriminator and try again. Return the unit to
GTT for service.
Opticom™ Infrared System
Symptom/Indication
Intersection is very
slow to respond.
Possible Cause
8. Troubleshooting
Solution
Improper detector
alignment.
Align the detector to overcome temporary signal
blockages or level the detector to allow a view of
the entire vehicle approach path.
Improper detector
alignment or dirty lens.
Check all detectors, primary and auxiliary, for:
aiming, dirty lens, misalignment, visual
obstructions, and faulty detectors.
Improper emitter alignment
or dirty lens.
Clean the emitter lens. Make sure the emitter is
level and aimed forward.
Range set point is not
correct.
Check the signal intensity threshold level
adjustment. Adjust if necessary by following the
procedures described in the Installation Instructions
for the Model 750 series phase selectors and Model
250 and 450 series discriminators.
Incorrectly programmed
controller.
Verify that the traffic controller is programmed to
respond to a priority control input in a safe and
timely manner.
8-5
Opticom™ Infrared System
A. Glossary
A. Glossary
Approach Direction
The term used to describe the direction from
which an emitter-equipped vehicle moves
toward, or approaches, an Opticom™
Infrared system equipped intersection.
Arbitration
The ability of a phase selector/discriminator
to allow only one request for priority control
to be active at one time regardless of how
many channels are active on the phase
selector/ discriminator.
Automated Signal Intensity Threshold Level
Setting(Range Setting)
The ability of the phase selector/discriminator
that allows the installer to automatically adjust
the sensitivity of the individual detector
channels by pressing the Range switch in a
maintenance vehicle equipped with a Model
792R emitter and a Model 793R emitter
control switch module.
Auxiliary Detector
One or two detectors wired to the auxiliary
inputs on the phase selector/discriminator.
Used to increase the distance over which an
emitter can be detected or provide detection
around corners.
Auxiliary Harness
A wiring harness that provides a breakout of
connector J1 on the Model 752 and 754
phase selectors. This breakout provides
connection points for auxiliary detector
inputs and green sense inputs.
Auxiliary Interface Panel
Terminal block assembly designed for
easy connections between a phase
selector/ discriminator and the traffic
controller cabinet wiring.
Card Rack
A device that houses phase selectors/
discriminators. Used to install a phase
selector/discriminator into a traffic controller
cabinet that does not have any input files
available.
Communication Module
An optional plug-in communication
interface board that plugs directly into a
Model 750 series phase selector. Used to
enhance the communication capabilities of
the phase selector.
Communication Port
An RS-232 standard serial interface that
allows communication between a phase
selector and external computers.
Confirmation Lights
Optional white lights mounted at the
intersection and aimed at the approaching
traffic. Intended to indicate to emergency
vehicle drivers that their call was received.
Desired Green
The anticipated result of an Opticom call.
The desired green is that which grants rightof-way to the requesting priority vehicle.
Detector
A device located at or near an intersection to
detect approaching vehicles equipped with
an Opticom Infrared system emitter. Used to
sense emitter pulses and convert them from
infrared energy to electrical signals that are
transmitted by the detector cable to a phase
selector/discriminator in the traffic controller
cabinet.
Detector Cable
A shielded cable with three conductors plus
a drain wire. Recommended cable for
connecting a detector to a phase
selector/discriminator.
Disable Input
Signal from an optional disable switch that
turns off the emitter.
Discrimination
The ability of a phase selector/discriminator
to recognize and differentiate between
Opticom emitter signals and other sources of
energy.
A-1
A. Glossary
Discriminator
An Opticom™ Infrared system component
housed in the traffic controller cabinet. The
discriminator discriminates between valid
emitter signals and other sources of energy
received by the detectors, and activates its
outputs in response to valid emitter signals.
Emitter
A rugged, compact, lightweight, weatherresistant, encoded signal device intended for
use on priority, maintenance, transit, and
probe vehicles. The emitter generates a series
of pulses in the infrared and visible
wavelengths that activate the Opticom
Infrared system.
First-Come, First-Served
The ability of a phase
selector/discriminator to treat same
priority inputs on a first-come, first-served
basis.
Four-Channel Adapter Card
A plug-in circuit board that allows the
installation of a four-channel phase selector
into a system chassis card slot that is wired
for a two-channel phase selector. The
adapter card provides the cross wiring
required to support the four-channel phase
selector.
Gated Advantage Priority
A phase selector function that provides
controlled benefit to low priority vehicles
such as buses. Used when the traffic
controller does not have internal Transit
Signal Priority(TSP) capabilities.
Green Sense Input
An AC signal from the traffic controller
cabinet, usually from a load switch that
controls the green light at the intersection.
There is one green sense input for each
phase for a maximum of eight inputs.
Opticom™ Infrared System
History Log
Information recorded by a phase selector
during a priority vehicle call. Includes
vehicle class and ID, call date and time (start
time, end time, and call duration), channel
sensing the call, priority, duration of final
greens, green status when call ended, emitter
signal intensity, and channel output activity.
Input File
A device in CA/NY Type 170 traffic
controllers to house printed circuit boards.
Lightbar
A mechanical device containing a
combination of warning lights, speakers,
sirens, etc. mounted on an emergency
vehicle.
NEMA
National Electrical Manufacturers Association
Phase Selector
An Opticom Infrared system component
housed in the traffic controller cabinet. The
phase selector discriminates between valid
emitter signals and other sources of energy
received by the detectors, and activates its
outputs in response to valid emitter signals. A
Model 752N/754N phase selector also sends
additional control signals to the traffic
controller to provide the sequence to the
desired green phase for the approaching
priority vehicle.
Preemption
The transfer of control from the normal mode
of traffic signal operation to a special control
mode.
Primary Detector
The detector connected to the phase
selector’s/ discriminator’s primary detector
input.
High Priority
An emitter signal that elicits a high priority
response from the phase
selector/discriminator. High priority emitters
are used by emergency vehicles such as fire,
ambulance, and police. A high priority
signal always overrides a low priority signal.
A-2
Probe Vehicle
An authorized service or maintenance
vehicle. In Probe mode, the phase selector
records the user class and vehicle ID, vehicle
Opticom™ Infrared System
location, and the date/time the vehicle
passed through the intersection, but does not
cause the controller to go into the Priority
Control mode of operation.
Signal Intensity Threshold Level Setting(Range
Setting)
The ability of the phase selector/discriminator
that allows the installer to set the sensitivity
of the individual detector channels.
Signal Phase
The right-of-way, change, and clearance
intervals in a given traffic cycle that are
assigned to an independent movement of
traffic.
System Chassis
A device that houses printed circuit boards,
and is prewired to accept Opticom phase
selectors and discriminators.
A. Glossary
Traffic Controller
An electrical or electromechanical device
that controls the sequence, duration, and
timing of traffic signal lights.
Transit Signal Priority
An emitter signal that elicits a low priority
response from the phase
selector/discriminator. Transit Signal Priority
emitters are used by vehicles such as transit
or maintenance vehicles that are intended to
be aided by the Opticom system, but have a
lower priority of service than vehicles with
high priority emitters.
Vehicle Identification Code
Emitter-generated, coded signal that
identifies the specific vehicle using the
Opticom system.
Visible Light Filter
A black lens that blocks the transmission of
all energy in visible wavelengths, but allows
infrared wavelength energy to pass. Used on
vehicles where the highly visible light from
an emitter may be undesirable.
A-3
A. Glossary
Opticom™ Infrared System
This page intentionally left blank.
A-4
Opticom™ Infrared System
B. Driving a Relay from a Phase selector
Driving a Relay from a Phase Selector
It is possible to drive an electromechanical or
solid-state relay from a phase selector output.
However, this application falls outside of the
intended use of the Opticom™ Infrared System
and the system was not designed for this
application. Should you do so on your own, it is
important to use a relay that falls within the
parameters described below to prevent damage to
the phase selector.
Figure 1 is a wiring diagram, which shows
how the relay is connected to the phase
selector.
CAUTION
Connect DC– to earth ground to allow
dissipation of static charges on the detector
cable. Failure to connect DC– to earth
ground may damage the equipment. If
detectors have been mounted but not
connected to the phase selector, strip
insulation from each detector cable and
connect all the wires to earth ground until
installation can be completed.
Figure 1. Wiring Diagram
* Numbers 1 – 4 correspond to the numbers in the Recommendations section on the next page.
B-1
Opticom™ Infrared System
Recommendations
1. Use a 1N4004 or equivalent diode.
2. Use a 24 VDC relay with a coil
impedance of approximately 1000 ohms.
The maximum amount of current that the
phase selector output is designed for is
50 mA.
The following relay manufactured by
IDEC meets the above listed
requirements:
•
Relay: RH1B-D-DC24V
•
Socket: SH1B-05
This relay contains a diode, so the diode
shown in Figure 1 is not needed.
This relay is available from Newark
Electronics and other electronics supply
houses.
NOTE: For applications with frequent
activations, it is recommended that a solidstate relay be used in place of an electromechanical relay. A load switch would be
another option.
•
B. Driving a Relay from a Phase selector
3. The following table lists the wire
colors for Channels A through D and
Logic Ground when using a Model
760 Card Rack. See Figure 1.
Channel Output
Wire Color
Channel A
Gray/White
Channel B
Blue/White
Channel C
Violet/White
Channel D
Brown/White
Logic Ground
Gray/Black
For more pin-out information, refer to the
Phase Selector Pin Index tables in the
Opticom™ Infrared System Phase Selector
Installation Instructions.
4. Phase selector 24 VDC power may be
used provided the total load between
relays and detectors is less than 300
mA. Model 711 detectors consume
15 mA and Model 721 and 722
detectors consume 30 mA.
Omron G3NA-205B-DC5-24
This relay is available from Digikey
www.digikey.com, (p/n Z165-ND) and
other electronics supply houses.
B-2
Important Notice to Purchaser:
EXCEPT FOR THE LIMITED WARRANTIES SET FORTH IN THIS DOCUMENT, GLOBAL TRAFFIC
TECHNOLOGIES (GTT) MAKES NO OTHER WARRANTIES AND EXPRESSLY DISCLAIMS ALL OTHER
WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY
WARRANTY AS TO MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE.
GTT will, at its sole option, repair, replace or refund any amounts paid for any OpticomTM Infrared System
component found to be defective in materials or manufacture within five (5) years from the date of shipment
from GTT. See “Warranty and Extended Coverage” for details and limitations of the coverage plan. GTT will
provide a functioning replacement component at a standard charge per unit for an additional five (5) years.
GTT warrants future system operability coverage as described herein. The warranties set forth in this
document shall not apply to (A) incandescent lamps (confirmation lights) or (B) to any Opticom infrared
system components which have been (1) repaired or modified by persons not authorized by GTT; (2)
subjected to incorrect installation, misuse, neglect or accident; (3) damaged by extreme atmospheric or
weather-related conditions; or (4) subjected to events or use outside the normal or anticipated course.
IN NO EVENT SHALL GTT BE LIABLE FOR ANY INJURY (INCLUDING, WITHOUT LIMITATION,
PERSONAL INJURY), DEATH, LOSS, OR DAMAGE (INCLUDING, WITHOUT LIMITATION, PROPERTY
DAMAGE), WHETHER DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR OTHERWISE,
ARISING OUT OF THE USE OR INABILITY TO USE, REPAIR OR FAILURE TO REPAIR, ANY GTT
PRODUCT. REGARDLESS OF THE LEGAL THEORY ASSERTED. THE REMEDIES SET FORTH IN THIS
DOCUMENT ARE EXCLUSIVE.
Sale and use of the Opticom infrared system is expressly restricted to authorized agencies of government
customers, within their specific jurisdictions. However, because the infrared signal generated by the
Opticom infrared system is not exclusive, GTT does not warrant exclusive activation by purchaser.
Global Traffic Technologies, LLC
Global Traffic Technologies Canada, Inc.
Opticom is a trademark of Global
7800 Third Street North
157 Adelaide Street West
Traffic Technologies, LLC
St. Paul, Minnesota 55128-5441
Suite 448
Used under license in Canada
1-800-258-4610
Toronto, ON M5H 4E7
Please recycle. Printed in the U.S.A.
651-789-7333
Canada
@ Global Traffic Technologies, LLC 2007
www.gtt.com
1-800-258-4610
All rights reserved.
75-0500-3341-6 Rev. D
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