Mitsubishi Electric NZ2GN2S1-16D - Page 208

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11 TROUBLESHOOTING
11.5 Examples of Troubles with the I/O Module
A load momentarily turns on from off when the system is powered off
■Cause
When an inductive load is connected, [2] Load may turn on from off due to a diversion of back electromotive force at [1]
Shutoff.
ON
OFF
ON
OFF
[2]
[2]
Y0
Y1
COM+
CTL-
Y0
Y1
COM-
CTL+
[3]
[3]
[1]
[1]
Load
Load
Load
Load
Output module
Back electromotive
force
Back electromotive
force
Output module
Sink output
Shut off
Shut off
Source output
+
-
+-