Rockwell Automation 61C345 4 Input 4-20mA Analog Rail Module - Manual (Page 33)

5Ć1
5.0 DIAGNOSTICS AND
TROUBLESHOOTING
DANGER
THE REMAINING STEPS ARE MADE WITH POWER ON. EXERCISE EXTREME
CAUTION BECAUSE HAZARDOUS VOLTAGE EXISTS. FAILURE TO OBSERVE
THIS PRECAUTION COULD RESULT IN SEVERE BODILY INJURY OR LOSS OF
LIFE.
WARNING
ONLY QUALIFIED ELECTRICAL PERSONNEL FAMILIAR WITH THE
CONSTRUCTION AND OPERATION OF THIS EQUIPMENT AND THE HAZARDS
INVOLVED SHOULD INSTALL, ADJUST, OPERATE, AND/OR SERVICE THIS
EQUIPMENT. READ AND UNDERSTAND THIS MANUAL IN ITS ENTIRETY
BEFORE PROCEEDING. FAILURE TO OBSERVE THIS PRECAUTION COULD
RESULT IN BODILY INJURY.
WARNING
INSERTING OR REMOVING THIS PRODUCT OR ITS CONNECTING CABLES MAY
RESULT IN UNEXPECTED MACHINE MOTION. POWER TO THE MACHINE
SHOULD BE TURNED OFF BEFORE INSERTING OR REMOVING THE PRODUCT
OR ITS CONNECTING CABLES. FAILURE TO OBSERVE THIS PRECAUTION
COULD RESULT IN BODILY INJURY.
This section explains how to troubleshoot the Analog Rail module. If
you cannot correct the problem using the instructions below, the
unit is not userĆserviceable.
5.1 Both LEDs on the Faceplate are Off
Problem: The PWR OK" and COM OK" LEDs on the faceplate are
off. This problem can indicate that the unit is not receiving the +5V
from the processor or Local or Remote Head, the 120 VAC or
24 VDC from the external power supply, or both within the specified
ranges. This problem can also indicate that the external power
supply fuse (.75A or .25A) has blown or that the module is
malfunctioning.
Step 1.
Stop any application programs or tasks that are running.
Use avoltmeter to measure the input power (120 VAC or
24 VDC) to the module. Verify that the power source is
providing 120 VAC or 24 VDC, whichever is appropriate.