Chapter 3 — Troubleshooting
28 PB50 and PW50 Forklift Power Supply Installation Guide
Identifying and Correcting Problems
Three basic procedures within this chapter identify and correct
most power supply problems you may encounter during
installation. Connector pin-out information is also furnished for
your convenience.
Recommended diagnostic procedures are listed below and in
general, should be followed in the order given. The
troubleshooting charts instruct you when to use a particular
method.
Troubleshooting the Power Supply
Here are the basic diagnostic procedures to follow when
troubleshooting the forklift power supply installation:
1 Inspect the hardware.
2 Check the electrical measurements.
3 Substitute components.
Inspecting the Hardware
Always check the hardware first. You should check the power
supply, the cables and connections, and the fuse.
Inspecting the Power Supply
The power supply has one or two green light-emitting diode
(LED) indicators near the output connector. The main output
LED is lit when 12 Vx is present at the output connector. If you
suspect a power failure, check for the following:
• If the LED is lit, and you suspect a power failure, check the
output cable and its connections.
• If the LED is not lit, the power supply is not producing
12 Vx output power. In this case, a fault can exist anywhere
in the system. Use the tables starting on page page 30 to
isolate, identify, and correct the fault.
• If the LED is flickering, the power supply has detected a fault
condition related to temperature, voltage, or current. The
LED will flicker until the problem is resolved. In some cases,
you may have to remove power to reset the power supply.
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