Unrequested Stop - Mitsubishi MELSEC-A A1SD71-S2 User Manual

8. TROUBLESHOOTING
MELSEC-A
8.2.6 Unrequested
stop
Check for a stop command from
the sequence program.
Stop command given? YES
,
Check the operation by skipping the stop com-
mand. Correct the sequence program if there are
problems.
NO
c
Disconnect stop signal cable.
NO
Stop signal circuit fault.
1
Check for sources of noise
(welder, power supply, etc).
Potential noise
NO
interference?
A1 SD71 or motor drive unit failure.
--f
Replace the unit.
AlSD71 error.
--f
Contact Mitsubishi representative.
Eliminate source of noise or
screen A1 SD71 cables etc.
I
c
Positioning stops?
Take appropriate measures to pre
vent noise interference.
Run signal cables away from
power cables.
Use shielded twisted-pair cable
for the signal cable.
Ground the module correctly.
Install the module away from
noise sources.
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