CN8501 Series

CN8501 Series
User’s Guide
www.omega.com
e-mail: [email protected]
CN8500 Series
1/16 DIN Temperature and Process
Controllers
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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and
reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.
Table of
Contents
Installation
Mounting
Contact Identification
Sensor Input Connections
Power Wiring
2
3
4
5
Operation
Notes on Outputs
Notes on Alarms
Parameter Menu Organization
and Descriptions
Tuning Procedures
6
13
16
20
Options
Auto/Manual
Remote Setpoint Select
Recorder Output (PV retransmission)
Transducer Excitation
Digital Communications
Recalibration Procedure
Error Codes
Technical Specifications
Ordering Codes
Warranty Information
26
26
28
29
30
37
37
38
42
44
Features
The OMEGA® CN8500 Temperature and
Process Controller features:
Omega LogicTM (allows selection of various cooling and
damping settings relative to single and multi-lag
processes and storage effects)
Single input, RTD, thermocouple, current and voltage
input models available
Voltage and current models scalable from -1999 to 9999
Non-volatile memory
NEMA 4X front panel
Adjustable hysteresis and heat-cool spread
User-selectable control modes (PID, PI, PD, and On/Off)
User-selectable ramp to setpoint
Auto-tuning, heat or cool
Dual output and alarm capability
RS-232 and RS-485 communications
Twin-branched double wipe contacts
Rugged molded housing with barriers and locking
terminals
100 mm depth behind panel
Wide range power supply: 100 to 250 Vac and 100 to
330 Vdc; 24 Vac/Vdc optional
1
Figure 1. Recommended Panel Layout for Multiple
Controllers
Installation
CL
Measurements between
centerlines of panel
cutouts
are minimum
recommended.
CL
2.850" (72.4 mm)
CL
2.150" (54.6 mm)
CL
1.171" (45 mm)
Figure 2. Case Dimensions
Prior to mounting the CN8500 Series in your panel, make sure
that the cutout opening is of the right size, 1.771" x 1.771"
(45 mm x 45 mm), and deburred to enable a smooth fit.
A minimum of 4" (100 mm) of depth behind the panel is required.
Case Clip
Bezel
Grips
Rubber Gasket
Customer Panel
Figure 3. CN8500 Series Mechanical Components
2
Mounting
Notes on Wiring
Slide the mounting collar off and remove any wrapping
material from the instrument. (To ease removal of the collar,
gently pry up all three tabs on each side with a thin-blade screwdriver.)
slide the mounting collar back onto the unit from behind the
panel. Press the tabs of the mounting collar into the ridges of
the case housing. The case should now be secure in the cutout.
If it can still be moved, reposition the mounting collar until the
unit is completely immobile within the panel.
If it is necessary to remove the CN8500 Series chassis from the
case housing, press the grips on each side of the front panel
bezel firmly until the tabs release. The chassis may then be
pulled out. To re-install, press both bezel grips simultaneously
and carefully push the chassis back into the case housing until
the tabs snap into place.
IMPORTANT: All electrical wiring connections should be made
only by trained personnel, and in strict accordance with the
National Electrical Code and local regulations.
Power and signal wires should always be kept separate and
input leads should never be placed in the same conduit as power
leads. We recommend separating connecting wires into bundles:
power, signal, alarms and outputs. These
bundles should then be routed through individual conduits.
Shielded sensor cables should always be terminated at panel
ground.
If additional RFI attenuation is required, noise suppression
devices such as an R.C. snubber at the external noise source
may be used.
Figure 4. Contact Identification
3
Sensor Input
Connections
Thermocouple circuit
resistance should not
exceed 100 ohms for
rated accuracy; errors
will occur at higher
resistance values. If
shielded thermocouple
wire is used, terminate
the shield only at panel
ground.
Use wire with a resistance no greater than
10 ohms. An error of
0.2° F will result for
each additional 10
ohms of resistance
encountered. If shielded RTD wire is used,
terminate the shield
only at panel ground.
4
Figure 5. Thermocouple Input Wiring
Make sure that you are using the
appropriate thermocouple and
extension wire. Connect the negative lead (generally colored red
in ISA-type thermocouples) to
contact #9; connect the positive
lead to contact #10. Extension wires must be the same
polarity as the thermocouple.
Figure 6. RTD Wiring
The CN8500 Series accepts
input from 2- or 3-wire, 100
ohm platinum resistance temperature detectors (RTDs).
Connect 2-wire RTDs to contacts #9 and #10, with a
jumper across contacts #8
Note: For 2 Wire RTD
and #9. Keep leads short and
Jumper 8 & 9
use heavy gauge copper
extension wire, if necessary, to minimize lead resistance. For
long runs, 3-wire RTDs should be used.
Figure 7. Process and Linear Input Wiring
Voltage Inputs: Connect the
positive voltage input to contact #10; the negative input to
contact #8.
mV/Current Inputs: Connect
the positive current input to
contact #10; the negative
input to #9.
Power Wiring
The CN8500 Series power supply accepts 100 to 250 Vac,
100 to 330 Vdc, or 24 Vac/Vdc line power without any switch
settings or polarity considerations. All connections should be
made in accordance with the National Electrical Code and
local regulations, using only NEC Class 1 wiring for all power
terminals.
It is advisable, but not necessary, to fuse one leg of the
incoming power line, contact #11, with a 2AG, 0.5 amp
rated fuse. Be sure that only instrument power input is
fused — not power to the load.
Figure 8. Power
Wiring
Connection
100 - 250 Vac 50/60 HZ
100 - 330 Vdc (Auto Polarity)
24 Vac/Vdc (Auto Polarity)
5
Operation
Omega CN8500 Series Universal Controller
The CN8500 Series is a full-function, autotuning PID controller, calibrated and pre-configured for your application
requirements, according to the ordering code specified, either
as a temperature or linear process controller.
Just a few easy steps are required before the instrument can
be placed into service. After completing the mounting and
wiring procedures as previously instructed, set your individual process parameter values by stepping through the
CN8500 Series’ setup menus, using the simple front-panel
keys as instructed. Then, initiate the autotuning sequence as
shown (or tune manually).
Notes on Outputs
When you ordered your CN8500 Series controller, a specific
output type was specified, designated as either “R1,R2”, “F1,
F2”, “DC1,DC2”, or “T1,T2”. If you ordered the dual-output
CN8502 model, you also had the option of configuring your
controller with either one or two output actions. Generally,
output 1 is a heat (reverse-acting) function and output 2 is a
cool (direct-acting) function. For best results, follow the
recommendations for setting cycle times for the output type
supplied with your controller. A brief description of output
types follows:
Output Type
6
Description
R
5A/3A (120/240 Vac) relay, normally
open, used for switching resistive loads. If
relays or solenoids are to be driven, select
the “T” output.
F
4-20 mA, full output to load with 500 ohm
impedance max. (suppressed).
DC
20 Vdc pulsed output for solid-state relays.
T
1 A @ 120/240 Vac , solid-state relay, zero
voltage-switched and optically isolated from
drive signal. Only resistive loads to
may be controlled directly. Larger loads
may be controlled using an external
contactor.
Operation
Figure 9. Front Panel Controls and Indicators
Output 1
LED indication
of Heat cycle
(Output 1 action)
Output 2
LED indication
of Cool cycle
(Output 2 action)
Alarm 1
LED indication
of Alarm1 condition
Alarm 2
LED indication
of Alarm 2 condition
Function 1
LED indication of
Special Function 1
Function 2
LED indication of
Special Function 2
After mounting and wiring your
CN8500 Series controller, you are
ready to set the parameter values
required of your application. Take
a moment to familiarize yourself
with the unit’s front panel controls and indicators.
Process Value
Displays measured
process temperature
in °F or °C or process
value in engineering
units
Setpoint Value
Displays programmed
setpoint temperature
in °F or °C or setpoint
value in engineering
units
Mode Key Used to access Standby,
Tune, Run or Manual modes.
Lower Key Used to scroll down through
available parameter settings, decrease values
or change menu levels (Hold for fast-step
progression)
Raise Key Used to scroll up through available
parameter settings, increase values or change menu
levels (Hold for fast-step progression)
Parameter/Access Key Used to index through parameters
or to access Menu Levels
7
Operation
Power On
When power is first applied to the CN8500 controller, all LED
segments and indicators are momentarily illuminated. The
Process Value (PV) window then displays [ -At- ] or
[ -Ap- ] and the Setpoint Value (SV) window displays an initialization code, e.g., [ tf06 ]. The last two digits of this code
indicate the software revision supplied with your controller.
Please provide this revision number when contacting us
regarding your controller. Depending upon whether Setpoint
Target Time [ SP.tt ] is enabled, you may also see this symbol:
or
. This means that the controller is ramping up or
down to setpoint according to its previously programmed
parameters. The default setpoint on initial power up is equal
to the process value. Before proceeding further, wait until the
display has stabilized and then use the Raise
or Lower
keys to enter or adjust your desired Setpoint Value.
Parameter Menu Organization
Your CN8500 Series controller has five distinct menu levels.
This enables quick access to relevant parameters without the
need for scrolling through long menus. Menu “05” is used for
8
Operation
You cannot enter
Standby Mode from
menu level “00”.
Follow the instructions
for changing menu
levels to select another
level.
initial controller configuration and menus “02” and “03” are
used for setting or changing parameters. Menus “00” and
“01” are used when the controller is in regular unattended
operation and are not used for setting parameters. For safety
and security purposes, we recommend placing the controller in menu level “00” or “01” when in regular operation; however, it is not required.
If you wish to “escape” from parameter selection within
these menus at any time, simply press the Mode
key
once. A description of the menu hierarchy and a detailed listing of menus and parameters begins on page 22.
Standby Mode
When the controller is placed in Standby Mode, outputs are
disabled; however, access is permitted to all menu levels and,
unless the controller is at Run menu levels “00” or “01”,
operating parameters may still be changed. Use this mode for
tuning the controller. To enter Standby Mode, press and hold
the Mode key
for four seconds until the lower window
display flashes [ StbY ]. To exit Standby Mode from Menu
Levels “01” to “05”, press and hold the Mode
key for four
seconds until the lower window display flashes [ tUnE ].
(If the Damping setting in menu “02” is [ OFF ], then [HEAt ]
or [ Cool ] will be displayed instead of [ tUnE ]. Press and
hold the Mode key for four more seconds until the lower
window returns to a steady display of Setpoint Value.
9
Operation
(This procedure will not affect tuning). Removing power to
the controller will also take the instrument out of Standby
Mode.
Accessing Menu Levels
To access menu levels from Standby Mode from menu
levels “02” to “05”, press the Parameter/Access
key
once. From menu levels “00” and “01”, press and hold the
Parameter/Access
key for approximately 11 seconds
until the lower window display alternates between [ Ac.Cd ]
and the menu level number last activated.
Changing or Displaying
Menu Levels
To change menu levels, access the menu level display as
instructed in the previous paragraph, then use the Raise
or Lower
key to set the desired menu level number. To
display the current menu level setting in menu levels “02” to
“05”, from Standby or while adjusting/viewing parameters,
press the Parameter/Access
key once. For menu levels
“00” and “01”, press and hold the Parameter/Access
key
for approximately 11 seconds.
10
Operation
Menu Level Descriptions
Because the CN8500
controller’s initial
configuration affects
other menu levels, it
is important to set all
required parameters in
this menu first before
accessing other
menu levels.
Menu “05” (Configuration Setup)
This is the menu level used for specifying initial configuration
parameters before the controller is placed in Run mode.
After changing the access code to “05” as instructed in the
previous paragraph, press the Parameter/Access
key to
step through the various control parameters. Available parameters will flash in the lower window display, alternating with
the current value for that parameter. To increase or decrease
the value, simply press the appropriate Raise
or Lower
key, then press the
key to step to the next parameter. To exit the menu at any time, press the Mode
key.
Note: When programming in menu level “05”, all outputs
are disabled; however, any active alarms will remain active
until the alarm condition is removed. New alarm conditions
will not be recognized.
Menu “04” (Communications and Calibration Setup)
This menu is used to set up the controller for digital
communications and for recalibrating the controller. If your
CN8500 Series controller was ordered with the digital communications option, set these parameters next. To access this
menu level, follow the instructions previously given.
11
Operation
Menu “03” (Alarm, Timing and Limit Setup)
In this menu, alarms, cycle times, setpoint target time and
limits are established. After changing the access code to “03”,
press the Parameter/Access
key to step through the various parameters. To set or change parameter values, follow
the instructions given previously.
Menu “02” (Control)
Gain, Rate and Reset parameters are automatically set during
autotuning. However, they can be manually adjusted by the
operator. To return the controller to the Run mode, change
the menu level access code back to “00” or “01” as previously shown.
Menu “01” (Run — Limited Access Mode)
The only parameter that can be changed at this menu level is
the Setpoint Value, using the appropriate Raise
or Lower
key. To set or change other parameters, the operator
must access another menu level by pressing and holding the
Parameter/Access
key for 11 seconds.
Menu “00” (Run — “Key Lock” Lockout Mode)
This menu is automatically active when power is first applied.
Both display windows are illuminated; however, access is
denied to all parameters. To set or change parameters,
the operator must access another menu level as instructed
previously.
12
Operation
Notes on Alarms
Either [ OUT 1 ] or [OUT 2 ] in menu level “05” (but not both)
may be configured as an alarm [ ALr ] if your CN8502 controller was ordered with an “R”, “DC” or “T” type of output
module. When one of the two available Outputs is configured
as an alarm, the other Output may be used for control .
When the controller is provided with the Dual Alarm option,
two independent alarms are automatically enabled for both
outputs. DO NOT USE THE [ ALr ] SETTINGS FOR [ OUT 1 ]
OR [ OUT 2 ]. Otherwise, follow the regular instructions for
configuring the Dual Alarms in menu level “05”.
The dual-output CN8502 offers a unique capability that provides for the activation of two software alarms (in addition to
the dual alarms) to monitor a total of four possible alarm conditions. To enable these software alarms, set the [ OUT 1 ] and
[ OUT 2 ] parameter(s) in menu level “05” to on/off mode
[ Ht.O ], [ CL.O ] or [ On.F ]. Set the Setpoint Value to your
first alarm point. Switch to menu level “02” and set Spread
[ C.Spr ] or [ Spr.2 ] to the desired deviation value from the
first alarm point. Set [H.HYS] and [C.HYS] to 1. Then switch
to menu level “03” and set the desired values for the third and
fourth alarm points at [ ALr 1 ] and [ ALr 2 ], respectively.
Press the Mode
key to resume operation.
13
Operation
Available Alarm Types [ A1.P.d. ] [ A2.P.d. ]
Selectable at menu level “05”, as either Process [ Pr ] or
Deviation [ dE ] and either high or low [ A1.HL ] or [ A2.HL ].
Process Alarm: Activates at preset value independent of
setpoint. “High” process alarm activates at and above alarm
setting. “Low” process alarm activates at and below alarm
setting.
Deviation Alarm: Activates at a preset deviation value from
setpoint. “High” or “Low” deviation alarm activates above or
below setpoint according to the preset deviation value.
When a latching alarm
has been activated and
the alarm condition
has been removed, the
Mode
key must be
pressed to unlatch the
alarm.
14
Latching Alarms
The CN8500 Series’s alarms may also be configured as latching alarms by selecting “LAt” in the [ A1.O.P.] or [ A2.O.P.]
parameter selection at menu level “05”.
Figure 10. CN8500 Series Controller Menu Hierarchy
(All access denied)
= temperature
controller only
= process
controller only
= temperature and
process controller
15
Parameter
Descriptions
CN8500 Series Temperature/Process Controller
Note: Menu parameters shown in regular
typeface appear only
for temperature
input types; menu
parameters in boldface are for linear/
process input types.
Menu “05”
Display
SnSr
The Digital Filtering
setting [ FILt ] on the
CN8500 Series
controller allows the
operator to compensate for noise which
may cause the last
digits of the PV display to become unstable. Sampling rate is
not affected. The settings are time constants, in seconds,
with 0.1 equivalent to
“no filtering.”
FILt
OUt1
Digital Filtering
Output 1 action
OUt2
Output 2 action
SN.00
Input Zero Level
Dec.P
FILt
OUt1
Decimal Point
Digital Filtering
Output 1 action
OUt2
Output 2 action
16
Parameter
Sensor type
Selection
Thermocouple:
K
J
N
R
T
S
Platinel II
RTD
RTD (decimal range)
Heat PID
Heat On/Off
Alarm
Cool PID
Cool On/Off
Alarm
(0-20mA)
(4-20mA)
PID
On/Off
Alarm
PID
On/Off
Alarm
Code
c.A
J
n
r
t
S
PLII
P (1 deg. resolution)
d (0.1 deg. resolution)
0.1-10.0
Ht.P
Ht.O
ALr
CL.P
CL.O
ALr
U.Su (Unsuppressed)
Su (Suppressed)
999, 99.9, 9.99
0.1-10.0
Pid
On.F
ALr
Pid
ON.F
ALr
Parameter
Descriptions
CoL.t*
Cooling type
A1.H.L. Alarm 1 select
A1.P.d.
Alarm 1 type
A1.O.P. Alarm 1 output
A2.H.L. Alarm 2 select
A2.P.d.
Alarm 2 type
A2.O.P. Alarm 2 output
Unlt
Measurement units
Water
Normal
Enable
Process/Deviation
Off/Normal/Latching
Enable
Process/Deviation
Off/Normal/Latching
°F or °C
H2o (non-linear output)
nor (linear output)
Lo/HI
Pr/dE
OFF/nor/LAt
Lo/HI
Pr/dE
OFF/nor/LAt
F/C
* For water-cooled extruders, select H2o.
Menu “04”
Display
Id.no
bAUd
CAL.L
CAL.H
Parameter
Device ID number
(remote communications)
Baud, parity and
data bit selection
Calibration low
Calibration high
Allowable Values
00 to 99
See chart below
Preset at factory
Preset at factory
Available Communications Settings
Display
3.o.7
6.o.7
12.o.7
24.o.7
3.n.8
6.n.8
12.n.8
24.n.8
Baud Rate
300
600
1200
2400
300
600
1200
2400
Description
Parity
Data Bits
odd
7
odd
7
odd
7
odd
7
none
8
none
8
none
8
none
8
Stop Bits
2
2
2
2
1
1
1
1
17
Parameter
Descriptions
When changing
thermocouple types,
be sure to check/adjust
upper and lower setpoint limit values.
Note: Menu parameters shown in regular
typeface appear only
for temperature input
types; menu parameters in boldface are for
linear/ process input
types.
Setting output cycle
time to “00” initiates
a 200 ms timebase.
Menu “03”
Display
ALr1
ALr2
CY.t1
CY.t2
SP.tt
L.SP.L
U.SP.L
L.SCL
H.SCL
Parameter
Alarm 1 preset
Alarm 2 preset
(if ordered)
Cycle time output 1
Cycle time output 2
Setpoint target time
(ramp-to-setpoint)
Lower setpoint limit
Upper setpoint limit
Low scale setting
High scale setting
Output Type
Recommended Setting
(seconds)
R (5A/3A)
15 to 120
F (4-20 mA)
MUST be set to 00
DC (pulsed 20 Vdc) 00 to 120
T (S.S. relay)
15 to 120
Menu “02”
Display
Parameter
Gn.o1
Gain Output 1
(PID heat gain)
Allowable Values
Dependent on sensor range
Dependent on sensor range
00 to 120 seconds
00 to 120 seconds
Off/1 to 100 minutes
Dependent on sensor range
Dependent on sensor range
-1999 to 9999
-1999 to 9999
A cycle time setting is required for
smooth proportional action. Too long
a setting will cause proportional ripple;
too short will decrease relay contactor
life. Shorter cycle times may be used
when driving heater loads directly.
Allowable Values
00 to 400
Notes on Setpoint Target Time: The [ SP.tt ] parameter allows the operator to enter a time delay for the
process to reach setpoint temperature (ramp to setpoint), from disabled [ OFF ] or 1 to 100 minutes. When
enabled, the ramp sequence starts on power-up. The ramp-to-setpoint feature will also be initiated whenever
a new setpoint target time is entered AND the Setpoint Value is 5° F or more from the current process temperature. In operation, the controller’s lower window display will flash
or
to indicate that it is
“ramping” up or down to setpoint. The Setpoint Value cannot be changed during this procedure. After it is
finished, the operator can adjust the setpoint temperature to the desired value.
While in ramp startup, the ramp-to-setpoint mode can be aborted and the controller returned to regular
operation by pressing the Parameter/Access
key until parameters are displayed and then pressing the
Mode
key once.
18
Parameter
Descriptions
Gr.o2
Setting Rate
(Derivative) or
Reset (Integral) to
[ 00 ] disables that
aspect of PID control. The ratio for
non-zero settings of
rate-to-reset is limited to a minimum of
1:4, i.e., Reset value
cannot be set any
lower than four
times Rate.
The parameters of
Heat Hysteresis,
Cool Hysteresis and
Cool Spread are
only available when
Output 1 and/or
Output 2 are set to
on/off mode [Ht.O]
or [CL.O]. They
replace Gain Output
1 and
Gain Ratio Output
2, respectively.
H.HYS
C.HYS
HYS1
units
HYS2
SPr.2
C.SPr
rAtE
rSEt
dPnG
Gain Ratio Output 2
(PID cool gain ratio)
Heat Hysteresis
Cool Hysteresis
Output 1 Hysteresis
0.0 to 2.0
Output 2 Hysteresis
Spread Adjustment, Output 2
Cool Spread
PID rate
PID reset
Damping (see notes)
1 to 100 units
0 to 100 units
0 to 100°
00 to 900 seconds
00 to 3600 seconds
Lo, nL, Hi, Off
01 to 100° (This value may
01 to 100° exceed 400 during
autotuning.)
1 to 100
Notes on Damping: The damping parameter is an autotune feature that enables more
precise control of setpoint overshoot during recovery from process upsets in which
thermal or transfer lag is a factor. See Figure 12. Use the correct setting prior to autotuning to compensate for power and load/sensor coupling characteristics.
Lo = Fast recovery with slight overshoot. For single-lag processes.
Ex. Adequate power and excellent load/sensor coupling.
nL = Normal recovery with no overshoot. For two-lag processes.
Ex. Properly sized heaters or components and good load/sensor
coupling.
Hi = Slow recovery with no overshoot. For three-lag processes.
Ex. Overpowered with multiple lags. Poor load/sensor
coupling.
Off = Autotune disabled; manual output control.
Note: Menu parameters
shown in regular typeface appear only for
temperature input
types; menu parameters in boldface are for
linear/ process input
types.
19
Figure 11. Typical Lag Processes
Immersion Heater
Lag
Flow
a. Single Lag
a1. Single Lag with
Dead Time
T/C2
T/C1
Flow
T/C
Tank Wall =
Thermal Resistance
b. Two Lag
Strip Heater
Thermal
Resistance
Flow
c. Three Lag
Tuning
Procedures
For best results in
tuning the temperature
controller, the setpoint
value should be at least
100°F above or below
ambient temperature.
While some processes
other than heat or cool
applications may
respond successfully to
autotuning procedures,
the controller must be
manually tuned for
most non-temperature
processes.
20
Strip Heater
Thermocouple
in Well
Thermal
Capacity
Introduction
The CN8500 Series is an “on demand” autotuning controller
that automatically sets PID parameter values (Proportional
Band, Reset and Rate) before the process reaches setpoint. A
damping setting (menu level “02”) MUST be selected for autotuning to take place The controller may also be tuned manually
(see page 31).
Autotuning the CN8500 Series Temperature
Controller
1) With the power off and the process at ambient, apply
power and immediately put the controller in Standby mode
by holding the
key for four seconds until [ StbY ]
flashes in the lower display window.
2) Enter the desired Setpoint Value using the appropriate
Raise
or Lower
key. [ StbY ] will continue to flash.
3) If controller is in menu level “00” or “01”, hold the
Parameter/ Access
key for 11 seconds until [ Ac.Cd ]
appears. Then change to menu level “05”. Otherwise, press
the
key once and use the
key to select menu level
“05”.
4) Press the Parameter/Access
key twice until [ SnSr ] is
displayed to make sure that the proper sensor has been
selected. Then set the controller’s heating mode or alarm
functions by pressing the Parameter/Access
key again
Tuning
Procedures
until [ OUt1 ] is displayed. (If you scroll past it, just
continue scrolling until the parameter menu repeats.) Using the
appropriate Raise
or Lower
key, select the one of the
following settings according to the requirements of your
process. Note: For autotuning, at least one output MUST be
set to PID mode.
Mode
PID
On/Off
Alarm
Output 1 (Heat) Setting
[ Ht.P ]
[ Ht.O ]
[ ALr ]
Output 2 (Cool) Setting
[ CL.P ]
[ CL.O ]
[ ALr ]
Press the Parameter/Access
key again to step to output 2 [
OUt2 ]. Repeat the selection process for cooling mode or alarm.
(If only one output is PID, set the other output to either On/Off
or Alarm.)
5) Press the Parameter/Access
key again to display the
Cooling Type parameter [ CoL.t ], and select either
Normal/Linear output [ nor ] or Water-Cooled/Non-Linear output
[ H2o ].
6) Exit menu level “05” by pressing the Mode
key once. The
lower window will flash [StbY]. Now press the
Parameter/Access
key once. The lower window will
display [Ac.Cd ] and [ 05 ]. Press the Lower
key twice
to select menu level “03”.
7) Press the Parameter/Access
key and select Cycle Time for
Output 1 [ CY.t1 ] and Cycle Time for Output 2 [ CY.t2 ]. For
Control Output type R or T, enter “15”. For Control Output type F
or DC, enter “00”.
8) Press the Parameter/Access key until Setpoint Target Time
[ SP.tt ] is displayed. Select [ OFF ].
9) Press the Mode
key once. The lower window will again
flash [StbY]. Press the Parameter/Access
key once and the
lower window will display [Ac.Cd ] and [ 03 ]. Press the Lower
key once to select menu level “02”.
10) Press the Parameter/Access
key and scroll through
the displayed parameters. If Gain Ratio [ Gr.o2 ] is displayed,
set it to [ 1.0 ]. Otherwise, continue scrolling until [dPnG ]
appears. Set Damping initially to Normal [ nL ]. (This setting
may have to be changed later. See Notes on Damping, page
26).
21
Tuning Procedures
Before autotuning can
take place, you must
select a damping
setting. If the damping
parameter does not
appear on the menu,
you have not selected a
PID option for outputs
1 or 2. Refer back to
step (4) and select the
proper setting(s).
During autotuning, the
process temperature
will gradually cycle
from ambient to setpoint. When autotuning
is complete, the [ tUnE ]
display will stop flashing and the Gain, Rate
and Reset numbers
"learned" will be kept in
memory for subsequent
startups.
22
11) Press and hold the Mode
key until [ tUnE ] flashes
in the lower display window. The controller is now autotuning. When it stops flashing, the autotuning procedure is
completed and the controller is ready for your process.
As a security measure, you may wish to place the controller
in Key Lock “00” or Limited Access “01” Run mode by
changing menu levels as instructed previously.
Note: Re-tune controller only from ambient temperature.
Autotuning will not function when process is at setpoint.
Figure 12. Typical
“Autotune”
Temperature Profile.
Tuning
Procedures
If overcooling exists on
heat/cool processes
after autotuning,
decrease Gain Ratio
[ Gr.o2 ] in steps of 0.1
until oscillation is
minimal. If cooling is
sluggish, increase the
value in steps of 0.1
until optimum results
are achieved.
Manual Tuning Procedure - Temperature
Controller (Zeigler-Nichols PID Method)
This tuning method may be used if the spread between ambient temperature and process operating temperature is small.
For best results, the use of a recording device is suggested
when tuning with this method.
1) Disable any cooling device used.
2) Apply power and place the controller in Standby by
pressing and holding the Mode
key for four seconds.
3) Using Raise
desired value.
or Lower
key, adjust setpoint to
4) Access menu level “02” following instructions given
previously.
Gain ratio [ Gr.o2 ] is
the cooling gain
expressed as a factor
of the heating gain.
5) Using the Parameter/Access
[ Gn.o1 ]. Select [ 01 ].
key, index to Heat Gain
Ex. [ Gn.01 ] = 100
Cooling Gain = 50
[ Gr.o2 ] = .5
8) Index to Reset [ rSEt ] and select [ 00 ]. Note: In order to
set Reset to [ 00 ] , Rate must first be set to [ 00 ].
6) Index to Gain Ratio [ Gr.o2 ] and select [ 1.0 ].
7) Index to Rate [ rAtE ] and select [ 00 ].
9) Change to menu level “03”.
10) Index to Cycle Time 1 [ CY.t1 ] and select the timebase,
in seconds, appropriate to the device being controlled.
23
Tuning
Procedures
11) Repeat for Cycle Time 2 [ CY.t2 ].
12) Change to menu level “05”.
13) Set Cooling Type [ CoL.t ] to [ nor ].
14) Press the Mode
key once. Setpoint Value will be
displayed. The recording device should now be tracking
process temperature.
15) Double the Gain [ Gn.o1 ] until a small, sustained oscillation is visible on the recording device’s trace.
16) Measure the period of one cycle of oscillation (“T” on the
diagram below).
T
17) Divide the period of oscillation (T) by eight (8). The
resulting number is the correct Rate time [ rAtE ] in seconds. Multiply this number by four. This is the correct
Reset time [ rSEt ] in seconds.
18) Multiply the gain (from step #15) by 0.6 and enter this
number as Gain [ Gn.o1 ].
19) Enable the cooling device. If overcooling exists, decrease
the Gain Ratio [ Gr.o2 ] in steps of 0.1 until temperature
oscillation stops. If cooling is sluggish, increase the Gain
Ratio in steps of 0.1 until optimum results are achieved.
24
Tuning
Procedures
Manual Tuning Procedure - Process Controller
(Zeigler-Nichols PID Method)
A chart recorder to monitor the process variable is required. The
controller must be properly scaled and filtering set as instructed
previously.
1) Apply power and place the controller in Standby by holding
the Mode
key for four seconds.
2) Adjust the setpoint to the desired value.
3) Access menu level “05” and select one output: [ OUt 1 ]
for reverse-acting control or [ OUt 2 ] for direct-acting
control. Set the active output to PID [ Pid ] and the unused
output to Alarm [ ALr ] or On/Off [ On.F ].
Calculate and enter these
numbers:
Rate [ rAtE ] = T/8
Reset [ rSEt ] = T/2
Gain [ Gn.01 ] = Gain from
Step (6)
On noisy processes,
where Rate cannot be
used:
Gain [ Gn.01 ] = from Step
(6) x 0.45
Reset [ rSEt ] = T/1.2
T
4) Access menu level “02” and set [ Gn.01 ] to 1.0; [ Gr.o2 ] to
1.0; and [ rAtE ] and [ rSEt ] to “00”.
5) Press the Mode
key for four seconds until display
flashes [ tUnE ]. Press the Mode key for another four seconds and the process will run in closed loop mode.
6) While monitoring the chart, increase Gain [ Gn.o1 ] by doubling the gain number until the process variable becomes
unstable. Then decrease Gain until the process oscillations
are sustained, neither increasing nor decreasing in amplitude
as a result of momentary setpoint change.
7) Multiply the Gain from Step (6) by 0.6.
8) Measure the period of one complete cycle of oscillation,
“T”, in seconds.
25
Options
In manual control
mode, error conditions
such as A/D errors
and open or reversed
sensors will be
ignored.
Auto/Manual Operation (Standard)
To put the controller in manual mode, set the damping [dPnG]
parameter in menu level “02” to [ OFF ]. Press and hold the
Mode
key for four seconds until the lower display window flashes [ StbY ]. Hold down the Mode key for another
four seconds to initiate manual operation. The lower display
window will flash percentage of output power, from 100 to
-100, alternating with the output controlled (temperature
controllers will flash [ HEAt ] or [ CooL], process controllers
will flash [ OUt1 ] or [OUt2 ].) To take the controller out of
manual mode, press and hold Mode
key to four seconds.
Note: The CN8500 Series controller can be ordered with
only one of the following options installed per instrument.
These options cannot be field-installed.
Remote Setpoint Select
If your CN8500 Series controller was ordered with this option,
you may select either of two setpoints for your process. The
second setpoint can be enabled only by an external switch or
signal, according to your ordering specifications. The "F2"
LED on the front panel will illuminate when a second setpoint
is selected.
26
Options
Option Part #
Description
-RSP1
External switch wired to terminals 6 and 7
Switch Open: Normal operation, first setpoint enabled
Switch Closed: Second setpoint enabled
Setpoint Adjustments: Made from front panel
-RSP2
External switch wired to terminals 6 and 7
Switch Closed: Normal operation, first setpoint enabled
Switch Open: Second setpoint enabled
Setpoint Adjustments: Made from front panel
-RSP3
0-5 Vdc signal at pins 6 and 7
0 Vdc: First setpoint enabled
5 Vdc: Second setpoint enabled
Setpoint Adjustments: Made from front panel
Maximum Input Impedance: 400 ohms @ +5 Vdc , 5 mA
Figure 13. Wiring
Diagram for
Remote Setpoint
Select Option
27
Options
These output values
are linear with and
dependent upon the
sensor being used,
i.e., the lowest value
of the sensor’s output range corresponds to zero or
low for the output
function.
For voltage output, a
jumper must be
installed between
terminals 13 and 14.
Figure 14. Wiring
Diagram for
Process Variable
Retransmission
28
Recorder Output (PV transmission)
If your CN8500 Series controller was ordered with this option,
you may retransmit the signal representing the process variable for analysis or storage to an external device that accepts
analog input, such as a chart recorder, datalogger, or process
control computer. These outputs are:
Suppressed:
1-5 Vdc/4-20 mAdc
Unsuppressed:
0-5 Vdc/0-20 mAdc
Ordering Suffix:
-PV1 = 4 to 20 mA
-PV2 = 0 to 5 Vdc
Iout (current output) = 0-20 mA/4-20 mA
Voltage Headroom = 8 Vdc (standard) ; 18 Vdc (for
multiple recording devices)
Vout (voltage output) = 0-5Vdc/1-5 Vdc
Iout Max
= 20 mA
Options
Transducer Excitation
The transducer excitation voltage option is used to produce
a constant dc voltage of Vdc out to an external device, eliminating the need for an additional external power supply.
Maximum Current: 22 mA
Output Voltage: 15 Vdc
Ambient Temperature: 0 to 55° C (32 to 131° F )
Ordering Suffix: -XP1
Figure 15. Wiring Diagram for Transducer Excitation
29
Digital
Communications
Two communication
options are available
for the CN8500 Series
which allow interfacing
to remote devices utilizing the most common
industry standards,
RS232 and RS485.
WARNING
Signal ground only.
Grounding to frame
may damage the
controller and void
warranty.
30
RS232
This method allows bidirectional data transfer via a threeconductor cable consisting of signal ground, receive input
and transmit output. It is recommended for communication
distances less than fifty feet between the computer terminal
and the instrument. Note: Multiple instruments cannot be
connected to the same port.
The RS232 port is optically isolated to eliminate ground loop
problems. Typically, “Data Out” of the computer/terminal
connects to the “RCV” terminal. “Data In” connects to the
“XMT” terminal. If shielded cable is used, it should be
connected to the frame ground at one end only. Signal
ground is to be connected at appropriate ground terminals.
RS485
The RS485 multipoint capability allows up to 32 controllers to
be connected together in a half-duplex network or up to 100
controllers with an appropriate communications repeater. This
method allows bidirectional data transfer over a shielded
twisted pair cable. The twisted pair cable is a transmission
line; therefore, terminating resistors are required at the most
distant ends of the line to minimize reflections (typically 60
ohms from each line to signal ground). The RS485 circuit is
fully optically isolated, eliminating ground loop problems.
Parallel drops from the transmission lines should be kept as
short as possible; however, the line may be daisy-chained at
Digital
Communications
each controller. The polarity of the line is important and each
device will specify an “A” (+) and “B” (-) connection.
*One PC to
one controller
only
Figure 16. Wiring
diagram for digital
communications.
31
Digital
Communications
Table 1. Communications Parameter List
(Temperature Controller)
Parameter No.
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
Description
Process Value
Setpoint
Access Code
Gain Output 1
Gain Ratio 2
Rate
Reset
Heat Hysteresis
Cool Hysteresis
Cool Spread
Damping
Alarm 1
Alarm 2
Cycle Time 1
Cycle Time 2
Setpoint Target Time
Low Setpoint Limit
High Setpoint Limit
Controller ID
Baud Rate
Display
nnnn
nnnn
Ac.Cd
Gn.o1
Gr.o2
rAtE
rSEt
H.HYS
C.HYS
C.SPr
dPnG
ALr1
ALr2
CY.t1
CY.t2
Sp.tt
L.SP.L
U.SP.L
Id.no
bAUd
Minimum
Maximum
Sensor Dependent
Low Limit
High Limit
00
05
00
400
0.0
2.0
00
900
00
3600
01
100
01
100
00
100
00
Low/Normal/High
Range Dependent
Range Dependent
00
120
00
120
00 (OFF)
100
Sensor Dependent
Sensor Dependent
00
99
300
2400
Table 2. Communications Parameter List
(Process Controller)
Parameter No.
00
01
02
32
Description
Process Value
Setpoint
Access Code
Display
nnnn
nnnn
Ac.Cd
Minimum
Low Scale
Low Scale
00
Maximum
High Scale
High Scale
05
Digital
Communications
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
Gain Output 1
Gain Ratio 2
Rate
Reset
Hysteresis 1
Hysteresis 2
Spread 2
Damping
Alarm 1
Alarm 2
Cycle Time 1
Cycle Time 2
Setpoint Target Time
Low Scale
High Scale
Controller ID
Baud Rate
Gn.o1
Gr.o2
rAtE
rSEt
HYS.1
HYS.2
SPr.2
dPnG
ALr1
ALr2
CY.t1
CY.t2
Sp.tt
L.SCL
H.SCL
Id.no
bAUd
00
0.0
00
00
01
01
00
00
Low Scale
Low Scale
00
00
00 (OFF)
-1999
-1999
00
300
400
2.0
900
3600
100
100
100
Low/Normal/High
High Scale
High Scale
120
120
100
9999
9999
99
2400
Table 3. Serial Communications Data Format
Baud
Code
0
1
2
3
4
5
6
7
Baud
Rate
300
600
1200
2400
300
600
1200
2400
Parity
Odd
Odd
Odd
Odd
None
None
None
None
Data
Bits
7
7
7
7
8
8
8
8
Stop
Bits
2
2
2
2
1
1
1
1
33
Digital
Communications
Interface Examples
This section describes the protocol for communication
between an CN8500 Series controller and either a video display terminal or computer ( referred to below as “the host”).
Message strings may be of two types — commands to controller or responses from controller.
General Comments
One host and multiple controllers may be interconnected on a
single bus. The host may send commands to any controller
and may receive responses from any controller. Each controller on the bus is assigned an identification code between
00 and 99. No two controllers on a given bus may have the
same identification code. Controllers are not capable of communicating with other controllers.
Every valid message begins with a pound-sign (#) character.
Every valid message ends with a carriage-return (<CR>)
character.
A valid message is composed of: Start Message, Controller ID
Code, Command, Parameter and Data.
Every response begins with a line-feed (<LF>) character and
ends with a carriage-return, line-feed pair (<CRLF>).
Figure 17. General Communications Message Format
Caution:
Modifying parameter
#19 (Baud Rate) by
host may cause loss of
data link.
#[controller id] [command] [parameter number]<new value><units> [CR]
OPTIONAL
OPTIONAL
Start of
message
SAMPLE
BASIC Program:
10 OPEN “COM2: 2400, N, 8,
1, CS, DS” AS #1
20 PRINT “WHAT IS
COMMAND”,
30 INPUT A$
40 PRINT #1, A$
50 INPUT #1, B#
60 PRINT “THE RESPONSE
IS: “; B$
70 PRINT
80 GOTO 20
90 CLOSE
ONE
Character
Upper case
or Lower case
R Read
M Modify
E Enter
Up to TWO
Numeric
Characters
00 to 99
Up to TWO
Numeric
Characters
00 to 99
SPECIAL
COMMANDS
N
ON
(Select)
F
OFF
(Deselect)
?
STATUS
0
1
2
3
9
Up to SIX
Characters
ONE Leading
Sign
‘-’,‘+’ or
Space and
FOUR
Numeric
Characters
with decimal
for decimal
parameters
Standby
Autotune
Manual
Ramp
Version
(Status Only)
Example: For Standby “On”, type #01N0[CR].
34
End of
message
ONE
Character
F Deg F
C Deg C
U PROCESS
SENSOR
None for default
Temperature units
or NON-THERMAL
parameters
Digital
Communications
Figure 18. Sample Communications Command
STANDBY ‘ON’ COMMAND TO CONTROLLER
STANDBY RESPONSE FROM CONTROLLER
STANDBY
Controller Id
End of
Message
< >
‘#01N0 CR
< >
< >< >
‘ LF #01N0 CR LF ’
Command
Executed
ON (Select)
Command
Start of Message
STANDBY ‘OFF’ COMMAND TO CONTROLLER
STANDBY RESPONSE FROM CONTROLLER
STANDBY
Controller Id
End of
Message
< >
‘#01F0 CR
< >
< >< >
‘ LF #01F0 CR LF ’
Command
Executed
OFF (Deselect)
Command
Start of Message
STANDBY ‘?’ COMMAND TO CONTROLLER
STANDBY RESPONSE FROM CONTROLLER
STANDBY
Controller Id
< >
End of
Message
‘#01?0 CR
Start of Message
< >
< >< >
‘ LF #01F0 CR LF ’
N
Status REQUEST
Command
Standby STATUS
is ‘off’
Standby STATUS
is ‘on’
Figure 19. Requesting a Parameter from a Controller
SAMPLE: READ, MODIFY, ENTER COMMANDS
READ MESSAGE TO CONTROLLER
Parameter Number
Controller Id
READ RESPONSE FROM CONTROLLER
Units
End of
Message
< >
< >
‘#01R00 CR ’
< >< >
‘ LF #01R00 = 0120F CR LF ’
Value read from
controller
Read
Command
Start of Message
MODIFY COMMAND TO CONTROLLER
Parameter Number
MODIFY RESPONSE FROM CONTROLLER
Controller Id
Units
Units
< >
< >
‘#01M01 0200F CR ’
Start of Message
Modify Command
End of
message
New Value
‘space’ for
Positive
< >< >
‘ LF #01M00 = 0200F CR LF ’
ENTER COMMAND TO CONTROLLER
Parameter Number
Modified Value
ENTER RESPONSE FROM CONTROLLER
Controller Id
Units
Units
< >
‘#01E01 0200F CR ’
Start of Message
Enter Command
New Value
‘space’ for
Positive
< >
< >< >
‘ LF #01E00 = 0200F CR LF ’
End of
message
Entered Value
35
Communications
Notes
Caution:
Wherever possible,
avoid using the
“Enter” command
and use “Modify” or
“Read” instead. The
“Enter” command
makes permanent
changes to the
NOVRAM in the
CN8500 Series’s
microprocessor, and
after accepting a
maximum capacity of
100,000 “Enter” statements, it will have to be
returned to the factory
and replaced.
1. The controller will respond with <LF>ERROR<CR><LF>
for messages containing invalid/incorrect commands,
parameter number or data (with decimal, if needed).
2. Process Value is a read-only parameter; therefore, a modify or enter command for Process Value will result in a
<LF>ERROR<CR><LF> response.
3. For modify or enter command: if the new value is out of
the parameter’s range, the controller will default to the
highest or lowest allowable parameter value.
4. Parameters with decimal data must contain a decimal
character in the data portion of the message.
5. Ramp “on” command (Setpoint Target Time) will not be
executed if ramp time is set to zero or absolute deviation
between Setpoint and Process Value is less than or
greater than 5 temperature or process units.
6. Autotune, manual and ramp commands are mutually
exclusive, i.e., selecting manual while autotune is enabled
will abort the autotune mode.
7. If the controller is in Standby mode, selecting autotune,
manual or ramp will de-select Standby.
8. Setpoint should not be modified while the controller is in
autotune or ramp mode.
9. The Setpoint Value enter command should not be executed while the controller is in manual mode.
36
Recalibration
Only qualified individuals utilizing the
appropriate calibration equipment
should attempt
recalibration of
the controller.
Your CN8500 Series has been calibrated at the factory, and
need not be adjusted during the life of the controller unless
sensor type is changed from thermocouple to RTD, or vice
versa. In the event that recalibration is warranted, follow
these procedures.
1) Access menu level “05” as previously instructed and
select the sensor type.
2) Use a calibrator with a range appropriate for the unit to be
calibrated and set the range, and a low or zero value.
3) Access menu level “04” and then the Parameter/Access
key until [ CAL.L ] is displayed. Then, press the Raise
or Lower
key until the number in the controller’s
upper (PV) display window matches the indicated value of
the calibration instrument.
4) Enter a value on the calibration instrument corresponding
with the high-end value of the sensor range (span).
5) Again, in menu level “04”, press the Parameter/Access
key until [ CAL.H ] is displayed. Then, press the Raise
or Lower
key until the number in the controller’s
upper (PV) display window matches the indicated value of
the calibration instrument.
6) Repeat steps 3 through 5 until all readings agree.
7) Return the controller to regular operation by pressing the
Mode
key.
Error Codes
Display
Problem
Action
[ Err.H ]
Open sensor
Check sensor and wiring
Check type of sensor
Recalibrate
[ Err.L ]
Reversed sensor
Check sensor and wiring
Check type of sensor
Recalibrate
[ Err.O ]
A/D error
Return to factory
[ Err.J ]
A/D error
Return to factory
----
Display out-of-range
Sensor over- or under-range
37
Technical
Specifications
Performance
Accuracy
Setpoint Accuracy
Temperature Stability
TC Cold End Tracking
Noise Rejection
Process Sampling Rate
Input Types
Thermocouple
RTD
DC Voltage
DC Current
±0.2% of full scale, ± one digit
1 °/0.1°
5 µV/°C max; 3 µV/°C typical
0.05° C/°C ambient
Common mode >100 dB
Series Mode >70 dB
10 Hz (100 ms)
6 (K, J, N, R, T, S)
Maximum lead resistance 100 ohms
for rated accuracy
Platinum 2- and 3-wire, 100 ohms at
0° C, DIN curve standard (0.00385)
0-50 mV/10-50 mV, 0-5 V/1-5 V,
0-10V/2-10 V
0-20 mA/4-20 mA
Input Impedances
0-50 mV/10-50 mV: 1 K ohm ± 1%
0-5/1-5 V: 100 K ohms ± 1%
0-20 mA/4-20 mA: 2.5 ohms ± 1%
0-10 V/2-10 V: 200 K ohms
38
Input Ranges and Resolutions
Input
Code
Type
Range
Resolution
J
Iron-Constantan
-18 to 760° C
0 to 1400° F
1° C
1° F
K
CHROMEGA®-ALOMEGA®
-18 to 1349° C
0 to 2460° F
1° C
1° F
T
Copper-Constantan
-129 to 316° C
-200 to 600° F
1° C
1° F
N
OMEGALLOY®
-18 to 1299° C
0 to 2370° F
1° C
1° F
R
Pt/13%Rh-Pt
-18 to 1760° C
0 to 3200° F
1° C
1° F
S
Pt/10%Rh-Pt
-18 to 1760° C
0 to 3200° F
1° C
1° F
RTD
2, 3-wire, 100-ohm Pt
-200 to 850° C
-328 to 1562° F
1° C
1° F
RTD
2, 3-wire, 100-ohm Pt
-128.8 to 232.2° C
-199.0 to 450.0° F
0.1° C
0.1° F
V5
1 to 5 V
0 to 5 V
Scalable (-1999 to +9999)
Scalable (-1999 to +9999)
Selectable
Selectable
V10
2 to 10 V
0 to 10 V
Scalable (-1999 to +9999)
Scalable (-1999 to +9999)
Selectable
Selectable
MV
10 to 50 V
0 to 50 V
Scalable (-1999 to +9999)
Scalable (-1999 to +9999)
Selectable
Selectable
MA
4 to 20 mA
0 to 20 mA
Scalable (-1999 to +9999)
Scalable (-1999 to +9999)
Selectable
Selectable
TC
RTD
39
Technical
Specifications
Outputs
#1
#2 (CN8502 only)
R1, R2
F1, F2
DC1, DC2
T1, T2
Reverse acting (heating) [alarm]
Direct acting (cooling) [alarm]
Relay, 5 A @ 120 Vac resistive
3 A @ 240 Vac
4-20 mAdc, 500 ohms max.
20 Vdc pulsed
Solid-state relay, 120/240 Vac,
zero voltage-switched,
1 A continuous, 10 A surge @ 25° C
Alarms
Electromechanical relay, 5 A @ 120 Vac,
3 A @ 240 Vac (Output 1 OR 2 only)
Dual-Alarm option: Two solid-state
relays, 120/240 Vac, zero voltageswitched, 1 A continuous, 10 A surge
@ 25°C
Control Characteristics
Setpoint Limits
Limited to configured range
Alarms
Adjustable for high/low; selectable
process or deviation
Rate
0 to 900 seconds
Reset
0 to 3600 seconds
Cycle Time
0.2 (zero setting) to 120 seconds
Gain
0 to 400
Gain Ratio
0 to 2.0 (in 0.1 increments)
40
Technical
Specifications
Control Hysteresis
Cool Spread, Output 2
(Temperature Controller)
Spread 2, Output 2
(Process Controller)
Damping
Setpoint Target Time
(Ramp-to-Setpoint)
Autotune
Manual
General
Line Voltage
Display
Power Consumption
Weight
Panel Cutout
Depth Behind Panel
Front Panel Rating
Operating Temperature
Humidity Conditions
Parameter Retention
Connections
Contacts
1 to 100 units (on/off configuration)
0 to 100° F/C (above setpoint)
0 to 100 units (above setpoint)
Selectable (low, normal, high, off)
0 (off) to 100 minutes
Operator-initiated from front panel
Operator-initiated from front panel
115 to 230 V ±10%, 50-60 Hz
115 to 300 Vdc ±10% (Auto-Polarity)
24 Vac/dc (optional)
Dual, 4-digit 0.36" (9.2 mm) LED display
Process Value: Orange
Setpoint Value/Menu: Green
Less than 6 VA (@ 120/240 Vac)
< 8 oz (< 226.8 g)
1.771" x 1.771" (45 mm x 45 mm)
3.937" (100 mm)
NEMA 4X
32 to 131° F (0 to 55° C)
90% R.H. max., non-condensing
Solid-state, non-volatile memory
Input and output via barrier strip
with locking terminals
Twin bifurcated
41
Ordering
Numbers
CN8500 Series
Ordering Number
Description
CN8501
1/16 DIN Single
output controller
1/16 DIN Dual
output controller
CN8502
Output Type - Ordering Suffix
5 A relay
1 A SSR
4-20 mA
20 Vdc pulse
CN8501
CN8502
-R1
-T1
-F1
-DC1
-R2
-T2
-F2
-DC2
Options (cannot be field-installed)
Description
Ordering Suffix
*Not available for voltage or
current input models (input
codes MV, V5, V10, or MA)
42
Dual alarms
RS-232 communications
RS-485 communications
4-20 mA recorder output
0-5 Vdc recorder output
Remote switch closed,
with one alarm
Remote switch open,
with one alarm
0 or 5 Vdc remote setpoint
with 1 alarm
Transducer power supply
-A
-C2
-C4
-PV1*
-PV2*
-RSP1*
-RSP2*
-RSP3*
-XP1*
Ordering
Numbers
CN8500 Series Option Compatibility
When the following features are used together, connections to all but
one must float, i.e., no more than one in each group can be referenced
to any ground.
Group 1
Group 2
Transducer excitation
Any input
F or DC output
Analog setpoint
Communications
Aux. output (P.V. retransmit)
DC alarms (except floating transistor)
Digital input (remote setpoint select)
Aux. output (P.V. retransmit)
Note: Auxiliary output (P.V. retransmit) and transducer
excitation cannot be used together in any configuration.
43
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
for a period of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1)
month grace period to the normal one (1) year product warranty to cover handling and shipping
time. This ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or
replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of
the purchaser, including but not limited to mishandling, improper interfacing, operation outside of
design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit
shows evidence of having been tampered with or shows evidence of having been damaged as a
result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components which
wear are not warranted, including but not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts
manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER
WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED,
EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability
of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which
liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a
“Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or
(2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or
damage whatsoever arising out of the use of the Product(s) in such a manner.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)
NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS).
The assigned AR number should then be marked on the outside of the return package and on any
correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
FOR WARRANTY RETURNS, please have the following information available BEFORE
contacting OMEGA:
1. Purchase Order number under which
the product was PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific
problems relative to the product.
FOR NON-WARRANTY REPAIRS, consult OMEGA for
current repair charges. Have the following information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover the
COST of the repair,
2. Model and serial number of the
product, and
3. Repair instructions and/or specific problems
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2004 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior
written consent of OMEGA ENGINEERING, INC.
44
Repair
Information
RETURN REQUESTS / INQUIRIES
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST
O B TA I N A N A U T H O R I Z E D R E T U R N ( A R ) N U M B E R F R O M O M E G A’ S
CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
DELAYS). The assigned AR number should then be marked on the outside of
the return package and on any correspondence.
OMEGA’s policy is to make running changes, not model changes, whenever
an improvement is possible. This affords our customers the latest in
technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2003 OMEGA ENGINEERING, INC. All rights reserved. This
documentation may not be copied, photocopied, reproduced, translated,
or reduced to any electronic medium or machine-readable form, in whole or
in part, without prior written consent of OMEGA ENGINEERING, INC.
This document is based on information available at the time
of its publication. While efforts have been made to render
accuracy to its content, the information contained herein does
not cover all details or variations in hardware, nor does it
provide for every possible contingency in connection with
installation and maintenance. Features may be described
herein which are not present in all hardware. Controls
assumes no obligation of notice to holders of this document
with respect to changes subsequently made.
Proprietary information of Controls, Inc. is furnished for customer use only. No other use is authorized without the written
permission of Controls, Inc.
45
Notes:
46
Notes:
47
Notes:
48
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
Shop online at www.omega.com
TEMPERATURE
✓ Thermocouple, RTD & Thermistor Probes, Connectors,
Panels & Assemblies
✓ Wire: Thermocouple, RTD & Thermistor
✓ Calibrators & Ice Point References
✓ Recorders, Controllers & Process Monitors
✓ Infrared Pyrometers
PRESSURE, STRAIN AND FORCE
✓
✓
✓
✓
Transducers & Strain Gages
Load Cells & Pressure Gages
Displacement Transducers
Instrumentation & Accessories
FLOW/LEVEL
✓
✓
✓
✓
Rotameters, Gas Mass Flowmeters & Flow Computers
Air Velocity Indicators
Turbine/Paddlewheel Systems
Totalizers & Batch Controllers
pH/CONDUCTIVITY
✓
✓
✓
✓
pH Electrodes, Testers & Accessories
Benchtop/Laboratory Meters
Controllers, Calibrators, Simulators & Pumps
Industrial pH & Conductivity Equipment
DATA ACQUISITION
✓
✓
✓
✓
✓
Data Acquisition & Engineering Software
Communications-Based Acquisition Systems
Plug-in Cards for Apple, IBM & Compatibles
Datalogging Systems
Recorders, Printers & Plotters
HEATERS
✓
✓
✓
✓
✓
Heating Cable
Cartridge & Strip Heaters
Immersion & Band Heaters
Flexible Heaters
Laboratory Heaters
ENVIRONMENTAL
MONITORING AND CONTROL
✓
✓
✓
✓
✓
✓
Metering & Control Instrumentation
Refractometers
Pumps & Tubing
Air, Soil & Water Monitors
Industrial Water & Wastewater Treatment
pH, Conductivity & Dissolved Oxygen Instruments
M1508/0804
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