Rockwell Automation 61C23 AutoMate Local I/O Head - Manual (Page 17)

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.
This section explains how to troubleshoot the Local I/O Head. Use
the LEDs on the faceplate to determine the state of the Local I/O
Head. If you cannot determine the problem from the instructions
below as a guide, the unit is not userĆserviceable.
5.1 All LEDs on the Faceplate Are Off
Problem: All LEDs on the faceplate are off. This problem indicates
that the Head is not receiving 120VAC power within the specified
ranges, the fuse has blown, or that the Head is malfunctioning.
Step 1.
Using avoltmeter, verify that the power source is 120VAC
(for M/N 61C22) or 24/48 VDC (for M/N 61C23) and that it
is functioning correctly.
Step 2. Stop any application programs that are running and turn
off power to the Local I/O Head.
Step 3. Inspect the fuse. If the fuse has blown, replace it following
the directions below. Otherwise, go on to step 4.
CAUTION
THE FUSE MUST BE REPLACED ONLY BY ANOTHER FUSE OF THE EXACT SAME
TYPE, AN AGC 4AMP FUSE. FAILURE TO OBSERVE THIS PRECAUTION COULD
RESULT IN DAMAGE TO OR DESTRUCTION OF THE EQUIPMENT.
a) Use a screwdriver to release the fuse holder located on
the faceplate. Pull the fuse holder out of the Local I/O
Head.
b) Take the old fuse out of the fuse holder and replace
with the new fuse.
c) ReĆinsert the fuse holder into the Local I/O Head. Turn
the screwdriver clockwise and press down on the fuse
holder at the same time. The fuse holder must be flush
against the faceplate.
Step 4. Disconnect the Rail cables from the Head and turn on the
power to the Head. If the LEDs are lit, there is a power
supply short in one of the Rails or Rail cables. Replace
one item (Rail or Rail cable) at a time until the problem
reĆappears.