lt control - DICKEY-john

lt control - DICKEY-john
OPERATOR’S MANUAL
LT CONTROL®
The LT Control in an open loop system, which is easy to install and
compatible with most pulse width modulated valves. The LT Control,
coupled with the SFCC15 cartridge kit, allows utilization of the existing “two
knob manual valves” and provides an economical solution to equip a
vehicle with a ground speed control system.
When interfaced with the speedometer of the truck, the LT Control
synchronizes the ground speed of the truck with the conveyor. This reduces
wasted material at intersections, and provides a more uniform application of
material on the road for safer and consistent driving conditions.
The LT Control will also work without a ground speed input. Simply set the
SPREADER CONTROL SWITCH to manual and rotate the CONVEYOR
dial to a higher setting to apply more material. When you are ready to stop
spreading, set the spreader control to OFF or rotate the conveyor dial to
ZERO.
The LT Control provides the following features:
– Variable conveyor control that is related to ground speed
– 20 position rotary dials, one for conveyor control and one for
spinner adjustment
– Momentary blast switch for spot spreading
– SPREADER CONTROL SWITCH for OFF, AUTO, and MANUAL
operation
– 2 digit LED display to assist with setup
The LT Control® is programmed at the factory with default values to operate
the SFCC15 cartridges. The Blast timer has been preset at 5 seconds. The
default values may need to be fine tuned to improve performance of the
control with SFCC15 valves or likely will need to be modified for other
values. Likewise, the Blast timer can be adjusted for optimum turn-off delay.
The Ground Speed Set Point is the only constant that does not have a
default value and must be set by the operator due to the variations found in
ground speed sensors.
LT Control
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LT CONTROL® 1
OPERATOR’S MANUAL
Figure 1
LT Control
2 LT CONTROL®
LT Control
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OPERATOR’S MANUAL
SYSTEM OVERVIEW
The LT Control system has been designed to increase the efficiency of the
material spreading operation and allow the hydraulic spreader control valve
to be installed outside of the cab. When in the AUTOmatic mode, the LT
Control varies the speed of the conveyor in proportion to ground speed to
maintain a uniform application of material on the road. Spreading
automatically starts when the vehicle begins to move and automatically
stops when the vehicle stops. When in the MANUAL mode, the conveyor
and spinner are active when the truck is moving or stationary. The control
system will not vary the speed of the conveyor in proportion with the ground
speed of the vehicle
The LT Control system consists of a control console, a ground speed
sensor, and two valves. There are two types of ground speed sensors
available for use with this system. One installs in line with the mechanical
speedometer cable and the other interfaces with the electronic speed
signal.
OPERATOR CONTROLS
SPREADER CONTROL SWITCH
The SPREADER CONTROL SWITCH is a three position switch.
– OFF position turns the spreader and spinner off.
– AUTO position provides automatic spreading control based on
vehicle ground speed.
– MANUAL position provides for spreading of material without vehicle
ground speed.
CONVEYOR DIAL
The conveyor dial is a twenty position detented switch used to adjust the
output of granular material application. Rotate the conveyor dial to a higher
setting to increase the material output or a lower setting to decrease the
material output.
SPINNER DIAL
The spinner dial is a twenty position detented switch used to adjust the
spread width or spinner speed. Rotate the spinner dial to a higher setting to
increase the spread width or a lower setting to decrease the spread width of
material. In the AUTO mode, the spinner will automatically stop when the
vehicle stops. In the MANUAL mode, the spinner runs continuously.
BLAST SWITCH
The blast switch is a momentary switch that will run the conveyor at its
maximum speed to apply a maximum output of material at intersections or
bridges. Blast is active when the vehicle is stationary or moving.
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SYSTEM OVERVIEW 3
OPERATOR’S MANUAL
4 SYSTEM OVERVIEW
LT Control
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LT Control
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Display
Blast switch
Spreader
control
switch
BLK
GRN
RED
WHT
RED
12V
BLACK
12V Power
Gnd
Gnd
RED
PWM
WHITE
Gnd
BLACK
GRAY
PWM
PIN B
PIN A
PIN B
PIN A
Spinner
46627-0250
Conveyor
Ignition Key Switch
RED
Gnd
Ground Speed
1
2 Sensor Connector
+12V 3
4
Gnd
+
–
Battery
SFCC15(ValveCartridge)
SFCC15(ValveCartridge)
GroundSpeedAdapter Cable
OPERATOR’S MANUAL
INSTALLATION
Figure 2
System Diagram
INSTALLATION 5
OPERATOR’S MANUAL
Use the mounting bracket provided to mount the console in the cab of the
truck in a location easily accessible by the driver. Connections are as
follows:
HARNESSES
– The red, fused lead hooks directly to the truck battery (the red
connects to the positive battery terminal).
– The black lead hooks to the battery’s ground (black or negative
terminal).
RED WIRE
– There is a separate red wire that connects to the truck’s ignition
(12Vdc when the key is in the ON position).
2-PIN CONNECTORS
There are two 2-pin female connectors. They attach to the Pulse Width
Modulator (PWM) valve.
– Red/black lead connects to the conveyor side of the PWM.
– Gray/white lead connects to the spinner of the PWM.
4-PIN CPC
– The 4-pin CPC attaches to the Ground Speed input.
6 INSTALLATION
LT Control
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OPERATOR’S MANUAL
PROGRAMMING/CALIBRATION MODE
For further explanation of the calibration parameters being entered, refer to
CALIBRATION DEFINITIONS.
Start the vehicle. This will ensure that calibrations will be stored properly
during the initial setup of the system. Upon initial startup, one red decimal
point should be lit in the display.
To enter the calibration mode, set the SPREADER CONTROL SWITCH to
OFF and depress and hold the BLAST SWITCH. Two decimal points on the
LED display, along with the code “C1” will flash to confirm entrance you are
in calibration mode.
Once the console is in calibrate mode, set the PWM Valve frequency.
SETTING THE PWM VALVE FREQUENCY
NOTE: To save the settings, it is
imperative to only cycle the
SPREADER CONTROL
SWITCH from OFF to AUTO to
OFF again. Do not cycle the
switch to the MANUAL position,
as this will erase the settings
you have selected, and the
process must be restarted.
SLOWLY rotate both the CONVEYOR and SPINNER dials simultaneously.
The direction or magnitude is irrelevant. The LED display will show decimal
points flashing alternately to verify the PWM frequency is being set. The
PWM frequency default is 250 Hz. The display only allows for two
characters at a time. Thus, if setting the PWM frequency for 250 Hz, only
the numbers “25” will be displayed. Pressing the BLAST SWITCH will
increase the PWM frequency in increments of 10, up to a maximum of 250
Hz (displayed as 25). The next press of the BLAST SWITCH will cycle the
PWM frequency to 50Hz (displayed as 5), the minimum on which the
system can run. Once the desired PWM frequency is displayed, store this
value by cycling the SPREADER CONTROL SWITCH from OFF to AUTO
to OFF. The status in the LED display will show “C1” and both red decimal
points will be flashing simultaneously. If a change to the PWM valve
frequency is not required, cycle the SPREADER CONTROL SWITCH from
OFF to AUTO to OFF to advance to setting the blast timer.
SETTING THE BLAST TIMER
Press and release the BLAST SWITCH. The blast time will be displayed on
the LED display and both red decimal points will light up to verify the blast
timer is being set. The blast timer can be set from 0 – 9 seconds. Increase
the number of seconds displayed by pressing the BLAST SWITCH. Once
the desired blast time is displayed, store this value by cycling the
SPREADER CONTROL SWITCH from OFF to AUTO to OFF. The LED
display will show “C1” and both red decimal points will be flashing
simultaneously.
SETTING THE PWM OFFSET AND SATURATION VALUES.
In order to achieve maximum performance of the conveyor and spinner, the
PWM offset and saturation values may be adjusted to control the range of
PWM duty cycle for each of these channels.
LT Control
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PROGRAMMING/CALIBRATION MODE 7
OPERATOR’S MANUAL
Once the hydraulics are engaged, the conveyor and spinner
become operational. Please take proper precautions to avoid
personal injury.
It is important to note that the conveyor and spinner are active during the
setting of the PWM offset and saturation values to allow the spinner and
conveyor speeds to be observed. This makes it easier to determine the
proper PWM offset and saturation values to enter for each of these
parameters. If the PWM offset and saturation values are already known,
they can be entered without activating the hydraulics of the truck.
To prepare for the calibration, SLOWLY turn the CONVEYOR and
SPINNER rotary dials to “0”. If the knobs are turned too quickly, too many
volts may be present and valve settings may be incorrect. Engage the
hydraulics.
NOTE: Starting the vehicle at this point
in the calibration process may
interrupt the 12Vdc power
supplied to the LT Control. You
may be required to re-enter the
calibrate mode. To eliminate
this potential problem, leave the
vehicle on during the entire
calibration process.
Set the SPREADER CONTROL SWITCH from OFF to MANUAL. The LED
display window will show “C2” and one red decimal point will be flashing.
CONVEYOR DIAL CALIBRATION
The CONVEYOR dial should be in the “0” position. Rotate the CONVEYOR
dial SLOWLY clockwise until the conveyor chain starts to creep. Turn the
CONVEYOR dial counter-clockwise one click. The LED display will show a
number, and the left decimal point will be lit (not blinking). This indicates the
current PWM offset value that will be stored in memory for the conveyor.
Cycle the SPREADER CONTROL SWITCH from MANUAL to AUTO to
MANUAL to store the conveyor PWM offset value in the memory of the LT
Control. The LED display will show “C2” and one red decimal point will be
flashing.
SLOWLY rotate the CONVEYOR dial completely clockwise. The conveyor
chain will be turning at its maximum RPM. The right decimal point on the
LED display will be lit (not blinking) to indicate that the PWM saturation
value is being set. A number will be displayed which represents the PWM
saturation value currently stored in memory. SLOWLY turn the CONVEYOR
dial counter-clockwise. The number on the LED display (PWM saturation
value) will change. Continue to rotate the CONVEYOR dial
counter-clockwise until the conveyor starts to slow down. The maximum
PWM saturation value has been reached. Cycle the SPREADER
CONTROL SWITCH from MANUAL to AUTO to MANUAL to store the
conveyor PWM saturation value in the memory of the LT Control.
8 PROGRAMMING/CALIBRATION MODE
LT Control
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OPERATOR’S MANUAL
SPINNER DIAL CALIBRATION
The SPINNER dial should be in the “0” position. Rotate the SPINNER dial
SLOWLY clockwise until the spinner starts to turn slowly or at the desired
speed. To prevent the spinner from creeping when turned to 0, turn the
SPINNER dial counter-clockwise one click. The left decimal point on the
LED display will be lit (not blinking) and a number will be displayed which
indicates the current PWM offset value that will be stored in memory for the
spinner. Cycle the SPREADER CONTROL SWITCH from MANUAL to
AUTO to MANUAL to store the spinner PWM offset value in the memory of
the LT Control.
Rotate the SPINNER dial completely clockwise. The spinner will be turning
at its maximum RPM. The right decimal point on the LED display will be lit
(not blinking) to indicate the PWM saturation value is being set. A number
will be displayed which represents the PWM saturation value currently
stored in memory. SLOWLY turn the SPINNER dial counter-clockwise. The
number on the LED display (PWM saturation value) will change and the
spinner RPM will decrease. Continue to rotate the SPINNER dial
counter-clockwise until the spinner is turning at a speed corresponding to
the desired maximum spread width or the desired PWM saturation value
has been reached. Cycle the SPREADER CONTROL SWITCH from
MANUAL to AUTO to MANUAL to store the spinner PWM saturation value
in the memory of the LT Control.
After the LT Control has been in operation for a period of time, it may be
desirable to modify the PWM offset or saturation values for the spinner or
conveyor. This is accomplished by entering the PWM OFFSET AND
SATURATION CALIBRATION MODE and rotating the dial associated with
the PWM value to change. Rotating the dial completely counter-clockwise
(the left decimal point is lit, not blinking) allows the PWM offset value to be
changed. Rotating the dial completely clockwise (the right decimal point is
lit, not blinking) allows the PWM saturation value to be changed. Cycling the
SPREADER CONTROL SWITCH from MANUAL to AUTO to MANUAL
stores the new PWM value.
Once again (the second time), cycle the SPREADER CONTROL SWITCH
from MANUAL to AUTO to MANUAL. This stores the desired values and
prepare the LT Control for the next step. The LED display shows “C2” and
there is one red decimal displayed (not blinking).
SETTING THE GROUND SPEED SET POINT
If the LT Control is connected to a ground speed sensor, the vehicle will
have to be driven with the conveyor turning in order to set a relationship
between ground speed and conveyor dial position. This relationship
determines how fast the conveyor will turn (amount of material spread) at
each conveyor dial setting for truck speeds between 1 to 60 m.p.h.
Establishing the ground speed set point is accomplished in the CALIBRATE
MODE with the SPREADER CONTROL SWITCH in the MANUAL position.
The desired conveyor PWM offset and saturation values must be entered in
the LT Control’s memory before setting the ground speed set point.
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PROGRAMMING/CALIBRATION MODE 9
OPERATOR’S MANUAL
Position the CONVEYOR dial to the mid-scale point. Drive the vehicle at a
speed that results in an average or typical density of material being applied.
Once the desired density of material has been reached, cycle the
SPREADER CONTROL SWITCH from MANUAL to AUTO to store the
ground speed set point in the memory of the LT Control. The LED display
shows “C3” and there is one red decimal displayed (not blinking).
The conveyor dial is now calibrated with the ground speed of the vehicle.
The unit may be operated in the AUTO mode for spreading material. This
provides a range of material density that can be applied on the road
associated with increasing and decreasing the conveyor dial setting. In
addition, as the vehicle speeds up and slows down, the LT Control will
automatically speed up and slow down the conveyor to maintain a
consistent density of material application.
NOTE: After the ground speed set
point is stored, it is advised that
the ignition key be turned off to
prevent any accidental changes
to the conveyor or PWM offset
or saturation parameters. If the
PWM offset or saturation
values associated with the
conveyor are altered after
performing the ground speed
set point calibration, the stored
ground speed set point is
cleared, requiring the ground
speed set point calibration to be
performed again. Error code
“E0” will be displayed.
The calibration of the LT Control is now complete. All of the calibration
values and settings that have been entered are stored in nonvolatile
memory. These values will not be lost or cleared if the LT Control is
disconnected from the vehicle battery.
To exit the calibration mode, power down the LT Control by turning the
ignition key off.
10 PROGRAMMING/CALIBRATION
LT Control
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OPERATOR’S MANUAL
OPERATION
AUTO MODE
In the AUTO mode, the control system will vary the speed of the conveyor
automatically in proportion with ground speed to maintain a uniform output
of material. The output of material being spread is changed by rotating the
conveyor dial to a higher or lower setting. The conveyor and spinner will
automatically stop when the vehicle stops.
MANUAL MODE
In the MANUAL mode, the conveyor and spinner are active whether the
truck is moving or stationary. The control system will not vary the speed of
the conveyor in proportion with the ground speed of the vehicle. The output
of material being spread is changed by rotating the conveyor dial to a higher
or lower setting. Spreading is stopped by setting the SPREADER
CONTROL SWITCH to OFF or rotating the conveyor dial to “0”.
BLAST MODE
The blast is active in the OFF, AUTO or MANUAL mode. If the BLAST
switch has been programmed for time, pressing and releasing the BLAST
switch will force the spreader to run at its maximum speed for the
programmed blast time and shut down. The blast timer can be interrupted at
any time by pressing the BLAST switch again. Blast is always active
regardless of whether the vehicle is moving or stopped.
UNLOADING THE SPREADER
The MANUAL mode of operation is used to unload the spreader.
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OPERATION 11
OPERATOR’S MANUAL
12 OPERATION
LT Control
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OPERATOR’S MANUAL
CALIBRATION
Calibration procedure flow chart
1
PWM
Frequency
2
Blast Timer
Rotate the
conveyor or
spinner knob
Decimal points
flash
alternately
Press the Blast Switch to
change frequency value by
increments of 10
Push the
Blast
Switch
Both
Decimal
points
displayed
Press the Blast Switch to
increase the timer until the
desired blast time is
displayed
To save entry,
cycle the
spreader
switch
from off
to auto
The calibration
mode is entered
by turning on the
key switch with
the Blast switch
depressed and
the spreader
switch in the
OFF position. The
software version
number will be
displayed prior to
entering the
1
Conveyor
Offset
2
Conveyor
Saturation
3
Spinner
Offset
4
Spinner
Saturation
Set spreader
switch to manual
(C2)**. Prior to
setting the
spreader switch
to manual, both
the conveyor and
spreader knobs
should be turned
to 0.
Slowly rotate the
conveyor knob CW
until the conveyor just
starts to run then turn
CCW one click
1
Conveyor
Offset
(0-85%)
Rotate the conveyor
knob completely CCWonly the left decimal
point will be lit
2
Conveyor
Saturation
(15-99%)
Rotate the conveyor
knob completely CWonly the right decimal
point will be lit
Rotate the conveyor
knob CCW until the
conveyor begins to
slow down
3
Spinner Offset
(0-85%)
Rotate the spinner
knob completely CCWonly the left decimal
point will be lit
Slowly rotate the
spinner knob CW
until the spinner just
starts to turn, then
turn CW one click
4
Spinner
Saturation
(15-99%)
Rotate the spinner knob
completely CW- only the
left decimal point will
be lit
Rotate the spinner knob
CCW until the spinner
turns at desired
maximum speed
To save entry,
cycle the
spreader
switch
from manual
to auto
To exit
calibration
mode, turn
ignition key
off
calibration mode
(C1).
Ground
Speed
Set
Point
Set the
spreader
switch to
manual
Rotate the
conveyor knob
to the
50 setting
Drive the truck at a
speed that provides
the desired material
application rate (C3)
To save entry, cycle the speader
switch from manual to auto and
then turn ignition key off.
Note:
Be sure to power off console
after completing the ground speed
calibration.
Accidental movement of either the
conveyor or spinner knobs before
power down will cause a need for
the ground speed set point to be
recalibrated.
Note:
*Conveyor or Spinner offset and saturation values can be modified with or without engaging the hydraulics.The PWM value can be seen
on the display.
**Any change to the conveyor PWM offset or saturation requires the ground speed set point to be recalibrated. An EO error will be
displayed in the operate mode until the ground speed set point is calibrated.
LT Control
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CALIBRATION 13
OPERATOR’S MANUAL
14 CALIBRATION
LT Control
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OPERATOR’S MANUAL
CALIBRATION DEFINITIONS
Following are definitions of the calibration settings discussed throughout
this manual.
Pulse Width Modulation (PWM) Valve Frequency is the valve
manufacturers suggested PWM operating frequency of the electric coil
used on the hydraulic valve. This value can be found in the particular valve
manufacturers specifications. The suggested PWM frequency for a Vickers
Valve is 100 Hz, while 250 Hz is suggested for the SFCC15 valve. The
range that can be entered into the LT Control is 50Hz to 250 Hz and is
preset at the factory at 250Hz.
Blast Timer is the time in seconds that the LT Control will operate in blast
when the BLAST switch is pressed and released. The range that can be
entered into the LT Control is 0 – 9 seconds and is preset at the factory at 5
seconds.
PWM Offset and Saturation is the minimum and maximum PWM signal
required to open a hydraulic valve to a desired position. The minimum PWM
signal positions the valve to allow the minimum hydraulic oil flow required to
start turning a hydraulic motor. The maximum PWM signal positions the
valve to allow a hydraulic oil flow to a hydraulic motor to obtain a desired
maximum motor RPM. The PWM range that can be entered into the LT
Control for the spinner and conveyor is 0% - 85% for the offset and 15% 99% for the saturation. The factory preset for the conveyor PWM min is
26% and max 80%, spinner PWM min is 26% and max 50%.
Ground Speed Set Point is a reference ground speed constant that is used
with the actual ground speed signal input from the trucks ground speed
speedometer sensor and the CONVEYOR dial position to obtain a desired
conveyor speed by controlling the conveyor PWM signal. In the AUTO
mode, the LT Control compares the ground speed input with the
CONVEYOR dial setting to determine the appropriate PWM signal to send
to the hydraulic valve based on the speed input during the calibration
procedure. As the vehicle speeds up and slows down, the LT Control will
automatically speed up and slow down the conveyor to maintain a
consistent conveyor speed and material discharge.
LT Control
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CALIBRATION DEFINITIONS 15
OPERATOR’S MANUAL
16 CALIBRATION DEFINITIONS
LT Control
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OPERATOR’S MANUAL
ERROR CODES
E0 - AUTO MODE GROUND SPEED CONSTANT NOT SET
There is no output in auto mode. Follow procedures for SETTING THE
GROUND SPEED SET POINT.
E1 - POWER UP NOT IN OFF
THe LT Control will not power up until the SPREADER CONTROL SWITCH
is set to the OFF position.
LT Control
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ERROR CODES 17
OPERATOR’S MANUAL
18 ERROR CODES
LT Control
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