Rockwell-automation 57C435 Processor Module, AutoMax Bedienungsanleitung PDF herunterladen (Seite 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: The OK" LED on the Processor module faceplate is off.

The possible causes of this problem are the following: the Processor

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, the Processor module must be replaced. Use the following

procedure to isolate a problem with the power 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 the power is on, the POWER ON" LED on the power

supply faceplate should be lit, indicating the presence of

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 are using Power Supply M/N 57C491:

If the power is on, the P/S READY" LED on the power

supply faceplate should be on. If the LED is off, use the

following procedure to isolate the problem.

a) Turn off power to the Rack and all connections.

Wait until the LEDs on the faceplate of the Power

Supply have gone out. Use a screwdriver to loosen

the screws holding the Power Supply module in the

Rack. Slide the module out about one inch to

ensure that the backplane connections have been

broken. Do not take the module out of the Rack.

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Rockwell-automation 57C435 Processor Module, AutoMax Bedienungsanleitung Seite 27