Components, Electrical – Wesley SCT-7750-8AC User Manual
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Owner’s Manual and Service Guide – SC & SCT Series
COMPONENTS
-
ELECTRICAL
Your Pack Mule vehicle should be equipped with one of the
following Curtis motor controller models:
24 Volt DC:
Curtis Model 1243
36 Volt DC:
Curtis Model 1243 or 1268
48 Volt DC:
Curtis Model 1268
36 Volt AC:
Curtis Model 1234
48 Volt AC:
Curtis Model 1234
If your vehicle is equipped with an older Sevcon motor
controller, please contact Wesley International for a copy of
the Sevcon controller manual, or download a copy from
Upgrade kits are available from
Wesley for those who wish to upgrade an older vehicle
equipped with a Sevcon controller to a Curtis controller
platform.
Contact Wesley’s parts department for more
information.
Programmable Parameters: All Pack Mule vehicles leave
the factory with standard default parameters programmed in
the controller, unless specific parameter settings are
requested at the time of order. These parameters can be
reprogrammed in the field using a Curtis handheld
programmer, available from Wesley. Generally, there are
five parameters which owners may want to modify to suit
their specific safety or user preferences as follows:
a) Acceleration Rate
b) Braking Rate
c) Deceleration Rate
d) Maximum Forward Speed
e) Maximum Reverse Speed
Acceleration Rate: The acceleration rate defines the time it
takes the controller to accelerate from 0% drive output to
100% drive output. A larger value represents a longer
acceleration time and a gentler start. Fast starts can be
achieved by reducing the acceleration time, i.e., by adjusting
the accel rate to a smaller value. The acceleration rate is
adjustable from 0.1 to 3.0 seconds. The default setting for
this is 1.6.
Braking Rate: The braking rate defines the time it takes the
controller to increase from 0% braking output to 100%
braking output (as defined by the corresponding mode-
specific brake current limit) when a new direction is selected.
A larger value represents a longer time and consequently
gentler braking. Faster braking is achieved by adjusting the
braking rate to a smaller value. The braking rate is
adjustable from 0.1 second to 3.0 seconds. The default
setting for this is 0.1
Deceleration Rate: The deceleration rate defines the time it
takes the controller to reduce its output to the new throttle
request when the throttle is reduced or released. A lower
value represents a faster deceleration and thus a shorter
stopping distance. The decel rate defines the vehicle’s
Braking characteristic for any reduction in throttle, including
to neutral, that does not include a request for the opposite
direction. The decel rate is adjustable from 0.1 to 10.0
seconds. The default setting for this is 2.5.
Maximum Forward Speed: The maximum forward speed
parameter defines the maximum controller voltage output at
full throttle, in the forward direction. The maximum forward
speed parameter is adjustable from the programmed creep
speed up to 100%. The default setting for this is 70, which
equates to about 7 mph (12.9 kph).
Maximum Reverse Speed: The maximum reverse speed
parameter defines the maximum controller voltage output at
full throttle, in the reverse direction. The maximum reverse
speed parameter is adjustable from 0% to 100%. The default
setting for this is 35 or about 1/2 the forward speed.
Controller Maintenance: There are no user serviceable
parts in the Curtis controller. No attempt should be made to
open, repair, or otherwise modify the controller. Doing so
may damage the controller and will void the warranty. It is
recommended that the controller be kept clean and dry and
that its fault history file be checked and cleared periodically.
Periodically cleaning the controller exterior will help protect it
against corrosion and possible electrical control problems
created by dirt, grime, and chemicals that are part of the
operating environment and that normally exist in battery
powered systems.
Use
the
following
cleaning
procedure
for
routine
maintenance:
1) Remove power by disconnecting the battery.
2) Discharge the capacitors in the controller by
connecting a load (such as a contactor coil or a horn)
across the controller’s B+ and B-terminals.
3) Remove any dirt or corrosion from the connector
areas. The controller should be wiped clean with a
moist rag. Dry it before reconnecting the battery. The
controller should not be subjected to pressured water
flow from either a standard hose or a power washer.
4) Make sure the connections are tight, but do not over-
tighten them.