Cisco Nexus 7000 Hardware Installation And Reference Manual page 254

Troubleshooting a DC Power Supply Unit
For a listing of the power supply unit LEDs and the conditions that they indicate, see
page D-6.
To troubleshoot a power supply problem, follow these steps:
Determine which power supply unit has a problem. Check to see which power supply unit does not have
Step 1
its Input and Output LEDs lit.
Note
If the Output LED is not lit, verify that the power switch on the power supply unit is turned to ON. If
Step 2
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:
Turn the power switch on the power supply unit to standby (STBY or 0).
a.
Turn off the DC circuit by manually shutting it down at the circuit breaker.
b.
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Warning
Statement 1003
Verify that the power cord is securely connected to the DC source or the DC power interface unit
c.
(PIU).
Hazardous voltage or energy may be present on DC power terminals. Always replace cover when
Warning
terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in
place. Statement 1075
Verify that the power cord is securely connected to the power supply unit. Verify that the cable
d.
retention device on the power supply unit is securely holding the power cord.
Turn on the power 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 required Input LEDs are still not lit, test the power source as follows:
Step 4
Turn the power switch on the power supply unit to standby (STBY or 0).
a.
Turn off the DC circuit by manually shutting it down at the circuit breaker.
b.
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
c. Disconnect the power cord from the DC source, and reconnect with another powered down DC
source.
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
9-4
If a power supply unit has only one power cord attached to a DC source, only the Input LEDs
(Input 1 and Input 2 or Input 3 and Input 4) for the connected half of the power supply unit
should be lit.
Chapter 9 Troubleshooting
Table D-6 on
OL-23069-07