Rockwell Automation 57C332 AutoMax Power Supply Module and Racks - Manual (Page 25)

4Ć1
4.0 DIAGNOSTICS AND
TROUBLESHOOTING
This section explains how to troubleshoot the Power Supply module
and Rack. Any problems with either the Power Supply module or the
Rack can usually be isolated by observing the condition of the LEDs
on the Power Supply module faceplate. Problems with the Rack
backplane (bus) will result in error codes on the LEDs of Processor
modules in the Rack. See JĆ3650 for more information on
troubleshooting the AutoMax Processor module.
DANGER
THE POWER SUPPLYMODULE OPERATES USING AC INPUT VOLTAGE
CAPABLE OF PRODUCING SEVERE SHOCK. MAKE CERTAIN THAT THE
EXTERNAL AC SUPPLYCIRCUIT IS TURNED OFF BEFORE INSERTING OR
REMOVING THE MODULE OR ANYCONNECTING WIRES. FAILURE TO
OBSERVE THIS PRECAUTION COULD RESULT IN SEVERE BODILYINJURYOR
LOSS OF LIFE.
If the problem cannot be determined using the troubleshooting
instructions below, the hardware is not userĆserviceable.
DANGER
SOME OF THESE STEPS ARE MADE WITH POWER ON. EXERCISE EXTREME
CARE BECAUSE HAZARDOUS VOLTAGE EXISTS. FAILURE TO OBSERVE THIS
PRECAUTION COULD RESULT IN SEVERE BODILYINJURYOR LOSS OF LIFE.
4.1 The POWER LED Is Off
Problem: the POWER LED on the Power Supply module is off. This
LED should always be on when input power is on and the input fuse
is in place and functioning correctly. If the LED is off, the module is
not receiving 120 VAC power. Use the following procedure to isolate
the problem.
Step 1.
Using a voltmeter, verify that the Rack is receiving 120 VAC
power.
Step 2. Turn off power to the Rack. Wait until all of the LEDs on the
faceplate of the Power Supply module have gone out.
Verify that the connections at the Rack and the L1 and L2
connections at the Power Supply module are tight.
Step 3. Remove the fuse cap and fuse and, using an Ohm meter,
verify that the fuse is not blown. If the fuse is good,
reĆinsert it and continue with step 4.
If the fuse is blown, verify that, for M/N 57C493, it is a 15A
MDA time delay type fuse. M/N 57C494 should contain a
5A MDA time delay type fuse. A blown fuse indicates that
the Power Supply should be replaced.
Step 4. Turn on power to the Rack. If the problem is not corrected,
replace the Power Supply.