Troubleshooting
Step 2
If the Output LED is not lit, verify that the power switch on the power supply unit is turned to ON. If not, turn it to ON
and verify that the Output LED turns on.
Step 3
If the required Input LEDs are not lit, test the power connections as follows:
a) Turn the power switch on the power supply unit to standby (STBY or 0).
b) Turn off the DC circuit by manually shutting it down at the circuit breaker.
Danger
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
c) Verify that the power cord is securely connected to the DC source or the DC power interface unit (PIU).
Hazardous voltage or energy may be present on DC power terminals. Always replace cover when terminals
Danger
are not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1075
d) Verify that the power cord is securely connected to the power supply unit. Verify that the cable retention device on
the power supply unit is securely holding the power cord.
e) Turn on the power at the circuit breaker.
f) Turn the power switch on the power supply unit to ON (or 1).
g) Check the Input LEDs to see if they are on yet.
Step 4
If the required Input LEDs are still not lit, test the power source as follows:
a) Turn the power switch on the power supply unit to standby (STBY or 0).
b) Turn off the DC circuit by manually shutting it down at the circuit breaker.
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Danger
Statement 1003
c) Disconnect the power cord from the DC source, and reconnect with another powered down DC source.
Hazardous voltage or energy may be present on DC power terminals. Always replace cover when terminals
Danger
are not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1075
d) Turn on the newly connected DC power source at the circuit breaker.
e) Turn the power switch on the power supply unit to ON (or 1).
f) Check the Input LEDs to see if they are on yet.
g) If the Input LEDs are not on, call TAC.
Step 5
If the Output LED is not lit, verify that the power switch on the power supply unit is turned to ON (or 1). If not, turn it
to ON (or 1) and see if the LED turns on.
Step 6
If the Output LED is not lit, verify that the power supply unit is properly seated in the power supply bay by performing
the following steps:
a) Turn the power switch on the power supply unit to standby (STBY or 0).
b) Turn off the DC circuit by manually shutting it down at the circuit breaker.
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Danger
Statement 1003
c) Pull the power supply unit part way out of the chassis and then push it back into the power supply bay. To remove a
6-kW power supply, you must first fully loosen its four captive screws. To remove a 3-kW, you must press and hold
its release latch to the left. When you reinstall a 6-kW power supply, tighten its four captive screws to 8 in-lb (0.90
N·m).
d) Turn on the DC power source at the circuit breaker.
Troubleshooting a DC Power Supply Unit
Troubleshooting
5
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