Rockwell Automation 57C332 AutoMax Power Supply Module and Racks - Manual (Page 26)

4Ć2
4.2 The FAULT LED is On
Problem: the FAULT LED on the Power Supply module is ON. This
LED should always be off when input power is on, the Power Supply
output voltage is within proper limits, and the watchdog alarm
coming from the backplane is not active. The rack must also contain
at least one AutoMax Processor module (or, for a remote rack, a
Remote I/O module). Note that the FAULT LED will be ON if there is
no Processor (or Remote I/O module) in the rack.
Use the following procedure to determine whether the problem is
caused by a malfunctioning Power Supply or by a watchdog alarm.
Step 1.
Verify that the Power Supply is securely seated in the rack.
The FAULT LED will come ON if there is not a good
connection to the rack backplane.
Step 2. If you have more than one Processor in the rack, a
watchdog timeout will not be indicated by the Power
Supply FAULT LED. If the Power Supply FAULT LED is ON,
the Power Supply must be replaced.
If the rack contains a single AutoMax Processor or is a
remote rack, check the OK LED on the Processor module
or Remote I/O module. If the OK LED is OFF, it may
indicate a watchdog timeout.
Step 3. Turn off power to the rack. Replace the Processor or
Remote I/O module. Turn on power to the rack.
Step 4. If the Power Supply FAULT LED turns ON, the Power
Supply is malfunctioning. Replace the Power Supply.