Chapter 3 — Troubleshooting
32 PB50 and PW50 Forklift Power Supply Installation Guide
Troubleshooting Power Failures From Other Sources
LED/Voltage Meaning Test or Possible Solution
LED not lit No output from
the power supply.
Tes t f o r in put voltag e .
No output
voltage, input
normal
Power supply not
working.
Replace power supply.
Voltage not
present
No input power
to the power
supply.
Try the possible solutions in this
order:
• Replace inline fuse if voltage
is not present at connector.
• Replace input power cable if
input voltage is still not
present at connector.
The fuse is
blowing, but no
LED is lit
Power system is
drawing too
much current.
Have the forklift vendor
recommend an inline filter and
alternate connection point.
Check cables for nicks, shorts,
and so on.
Power Supply Pinouts
Connector Negative Positive Case
Input power connector Pin 1
Pin2
Pin 3
Pin 4
NC
Secondary output power
connector (heater)
Pin 1 Pin 2
Main output power connector Pin 3 Pin 2 Pin 1
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