PS
S5.0
5000
001
OE35
Version noT-code
F-code
Section
C-code
Electrical System with TX and TT Card
142
Service Manual
1997-10-23
4.15. Thermal Protector - (TP)
This temperature sensitive device is mounted on the 1REC
heat sink. If the 1REC temperature begins to exceed the
design limits, the thermal protector will lower the maximum
current limit and not allow 1REC to exceed its temperature
limits. Even at a reduced current limit, the vehicle will
normally be able to reach sufficient speed for full 1A
operation, thereby allowing the panel to cool. As the panel
cools, the thermal protector will automatically return the
control to full power.
4.16. Low Voltage
Batteries under load, particularly if undersized or more than
80 percent discharged, will produce low voltages at the SCR
control terminals. The EV-100 control is designed for use
down to 50 percent of a nominal battery volts of 36-84 V, and
75 percent of a nominal battery volts of 24 V. Lower battery
volts may cause the control to not operate correctly; however,
the PMT should open the forward or rearward contactor in the
event of a commutation failure.
4.17. Top Speed (Motor volts) Limit
This feature provides a means to limit motor volts to three
adjustable limits by limit switch opening between input points
on the control card and negative. The lower motor volt limit
always takes priority when more than one switch input is
closed. This motor volt limit effects top speed of the SCR, but
actual truck speed will vary at any set point depending on the
loading of the vehicle. Each speed limit is adjustable by the
handset, function 11, 12, and 13, for speed limits 1, 2, and 3.
4.18. Steer Pump Contactor Time Delay
This function provides a 0.5 to 63 second time delayed drop
out of the power steering contactor when the foot pedal
switch is opened.
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