Rockwell Automation 57C435 Processor Module, AutoMax - Manual (Page 27)

5Ć1
5.0 DIAGNOSTICS AND
TROUBLESHOOTING
This section explains how to troubleshoot the Processor module and
field connections. If the problem cannot be corrected by following the
instructions below, the module is not userĆserviceable.
WARNING
WHEN WRITING TO OUTPUTS, BE CAREFUL TO INSURE THAT NO UNEXPECTED
MACHINE MOTION WILL RESULT. FAILURE TO OBSERVE THIS PRECAUTION
COULD RESULT IN BODILY INJURY OR DAMAGE TO EQUIPMENT.
5.1 The OK" LED Is Off
Problem: TheOK" LED on theProcessor modulefaceplateis off.
Thepossiblecauses of this problem arethefollowing: theProcessor
has failed its powerup diagnostics, the watchdog timer has been
allowed to expire, or the power supply is malfunctioning. If the power
supply is functioning correctly, i.e., providing sufficient power to the
rack, theProcessor modulemust bereplaced. Usethefollowing
procedureto isolatea problem with thepower supply:
DANGER
THE CONNECTOR ON THE FACEPLATE OF THE POWER SUPPLY IS AT LINE
VOLTAGE WHEN AC POWER IS APPLIED. DISCONNECT ALL POWER FROM
THE POWER SUPPLY BEFORE HANDLING THE WIRING. FAILURE TO OBSERVE
THIS PRECAUTION COULD RESULT IN SEVERE BODILY INJURY OR LOSS OF
LIFE.
Step 1. Verify that the power supply is receiving 115V AC power.
If thepower is on, thePOWER ON" LED on thepower
supply faceplateshould belit, indicating thepresenceof
115V AC power. If the LED is not lit, check the wiring to the
faceplate terminals marked 120VAC L1" and L2".
Step 2. Verify that there has been no short circuit.
A. If you areusing Power Supply M/N 57C491:
If thepower is on, theP/S READY" LED on thepower
supply faceplateshould beon. If theLED is off, usethe
following procedureto isolatetheproblem.
a) Turn off power to the Rack and all connections.
Wait until theLEDs on thefaceplateof thePower
Supply havegoneout. Usea screwdriver to loosen
the screws holding the Power Supply module in the
Rack. Slidethemoduleout about oneinch to
ensurethat thebackplaneconnections havebeen
broken. Do not takethemoduleout of theRack.