Filter
Top Products
2. Troubleshooting System Failures
17
2.2.2 Isolating Failures on External Power Unit
If the external power unit fails, follow the steps below to isolate the failure.
Table 2-5: Isolating Failures on External Power Unit
Table 2-6: Isolating Failures on External Power Unit (Main Body)
Table 2-7: Isolating Failures on Power Module
No. Failure Action
1 POWER LED on the external power unit is lit in
green
Check LED on the power module mounted on the external power unit
and identify the power module that is not normally running. If the power
module is normally running, the states below are provided.
• EPU-A:
DC-OK: Lit in green, DC-ALM: OFF
• EPU-B:
DC-OK: Lit in green, DC-FAIL: OFF, AC-OK: Lit in green
For the power module that is not normally running, implement "Table
2-7: Isolating Failures on Power Module."
2 POWER LED on the external power unit is OFF Follow the steps in "Table 2-6: Isolating Failures on External Power
Unit (Main Body)."
No. Failure Action
1 Power switch on the external power unit is OFF Turn on the power switch.
2 Power cable of the external power unit is not
correctly connected to the system
1. Turn off the power switch.
2. Connect the power cable correctly.
3. Turn on the power switch.
3 Input power to the external power unit is out of the
range below
(AC power supply: 90 to 132V)
Ask the system administrator to take the action because of the failure on
the power supply facility (i.e. not the failure on this system).
4 Other than 1 to 3 above Replace the external power unit.
No. Failure Action
1 Power switch on the power module is OFF Turn on the power switch on the power module.
2 Power cable of the power module is not correctly
connected to the system
1. Turn off the power switch on the power module.
2. Connect the power cable correctly.
3. Turn on the power switch on the power module.
3 Power module is not correctly mounted on the
external power unit
1. Turn off the power switch.
2. Mount the power module correctly.
3. Turn on the power switch.
4 Other than 1 to 3 above Replace the power module.