Big Joe PDBB-20-T12, Operation, Maintenance, Repair Parts List

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901357 10-3
10-2.EMERGENCY POWER DISCONNECT
The emergency power disconnect is located in front of
the steering arm as shown in
Figure 10-1 or Figure 10-
2 . Refer to Figure 10-3 for disassembly of the com-
plete emergency power disconnect. Refer to Figure
10-4 for disassembly of the contactor.
10-3.ELECTRICAL CONTROL PANEL
10-3.1.Maintenance
There are no user-serviceable parts inside the control-
lers. No attempt should be made to open the control-
ler. Opening the controller may damage it and will void
the warranty.
The transistor controller is programmed at the factory
specifically for the truck model on which it is equipped.
It is important to replace the controller with the correct
preprogrammed unit to asure proper performance set-
tings intended for that particular truck. See
Figure 11-
21 for the preprogrammed controller number.
It is recommended that the controller exterior be
cleaned periodically, and if a handheld programmer is
available, this periodic cleaning provides a good
opportunity to check the controller's diagnostic history
file. It is also recommended that the controller's fault
detection circuitry be checked whenever the vehicle is
serviced.
10-3.2.Cleaning
1. Remove power by disconnecting the battery.
2. Discharge the capacitors in the controller by con-
necting 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 bus bar
area. The controller should be wiped clean with a
moist rag. Allow it to dry before reconnecting the
battery.
4. Make sure the connections to the bus bars are
tight. Use two well insulated wrenches for this
task in order to avoid stressing the bus bars.
10-3.3.Diagnostic History
The handheld programmer can be used to access the
controller's diagnostic history file. When the program-
mer is connected to the unit, the error log file is auto-
matically uploaded into the handheld programmer.
To see the present status of the unit, use the Menu
Navigation Key to select:
Faults->System Faults.
To access this log, use the Menu Navigation Key to
select:
Faults->Fault History.
The faults are shown as a code and descriptive text. If
there are multiple faults, you have to scroll through the
list using the Up and Down Buttons on the Menu Navi-
gation Key.
The faults may be intermittent faults, faults caused by
loose wires, or faults caused by operator errors. Faults
such as contactor faults may be the result of loose
wires; contactor wiring should be carefully checked
out. Faults such as HPD or overtemperature may be
caused by operator habits or by overloading.
After a problem has been diagnosed and corrected,
clearing the diagnostic history file is advisable. This
allows the controller to accumulate a new file of faults.
By checking the new diagnostic history file at a later
date, you can readily determine whether the problem
was indeed completely fixed.
To clear the diagnostic history file, select:
Faults->Clear Fault History.
You will be asked to confirm your actions. Use the
increment arrow (+) for yes and decrement arrow (-) to
cancel and not clear the Fault History.