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Chapter 9: Troubleshooting
198
AT-SBxPWRSYS1 and AT-SBxPWRPOE1 AC Power Supplies
A power supply is operating normally when its AC and DC LEDs are solid
green and the Fault LED is off. Possible fault conditions and their solutions
are described here:
Fault Condition 1: If the AC LED is off, the power supply is not receiving
power, has overheated and been disabled, or has failed and needs to be
replaced. Try the following:
Verify that there is a power cord connected to the power supply’s
connector on the back panel of the chassis. For example, if a
power supply in slot C does not have power, check for a power
cord on connector C on the back panel.
Verify that the power cord is securely connected to the chassis and
the AC power source.
Verify that the AC power has power by connecting another device
to it.
Verify that the power from the AC power source is within the
required levels for your region.
If the chassis is still operating, use the SHOW PSU or SHOW PSU
ALL command from a local or remote management session to
determine if the power supply has overheated and shutdown.
Fault Condition 2: If the AC LED is solid green and the DC LED is off, the
power unit is generating insufficient DC power. Replace the power supply.
Fault Condition 3: If the Fault LED is solid amber, try the solutions in Fault
Condition 1. If they do not resolve the problem, replace the power supply.
Note
The power supplies are hot swappable in a redundant configuration.
This allows the AT-SBx3112 Chassis to continue operating while
you exchange power supplies.
Fault Condition 4: If the LEDs on the power supply indicate normal
operations but the PSU LED on the active master control card is showing
a fault condition, the problem may be with one of the two power supply
interfaces (opto-couplers) on the rear panel of the chassis. For
troubleshooting suggestions, refer to “Power Supply Interfaces (Opto-
couplers)” on page 212.
Caution
The power supply interfaces are not hot swappable and should only
be serviced by an authorized service technician.