Troubleshooting For Output Circuit - Mitsubishi Electric MELSEC iQ-R Series User Manual

Troubleshooting for output circuit

This section describes the troubleshooting for output circuit.
A load momentarily turns on when the load power supply is powered on
■Cause
When an inductive load is connected, the load [2] in the off state may turn on due to a sneak current from the back EMF at the
shutoff [1].
Safety remote I/O module
Source + Source output
Y0
ON
24G (L PW)
Y1
OFF
24G (L PW)
+24V (L PW)
24G (L PW)
Safety remote I/O module
Sink + Source output
Y0+
ON
Y0-
ON
Y1+
OFF
Y1-
OFF
+24V (L PW)
24G (L PW)
■Action
Take the action 1 or action 2 shown below.
1.
To suppress the back EMF, connect a diode parallel to the load where the back EMF has been generated.
- Back EMF +
Load
- Back EMF+ [3]
Load
[2]
Load
[1]
Shut off
[3]
- Back EMF+
Load
[2]
Load
[1] Shut off
10 TROUBLESHOOTING
10.6 Fault Examples with the Safety Remote I/O Module
10
93