10 TROUBLESHOOTING
10.5 Fault Examples with the Safety Remote I/O Module
115
10
Troubleshooting for output circuit
This section describes the troubleshooting for output circuit.
A load momentarily turns on from off when the system is powered off
■
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].
■
Action
Take one of the two actions shown below.
• To suppress the back EMF, connect a diode in parallel with the load under the back EMF influence [3].
• Configure another current path by connecting a diode across positive and negative of the external power supply.
D1 indicates the following.
Reverse voltage VR (VRM)
*1
Forward current IF (IFM)
*2
*1 Approximately 10 times the rated load voltage in the specifications
Example: 24VDC
Approx. 200VDC
*2 Twice the maximum load current (common) in the performance specifications or more
Example: 4A/1 common
8A or more
Y0
Y1
IO24V
ON
OFF
COM-
IO24G
[2]
[3]
Load
Load
Back electromotive
force
[1] Shut off
Source output
Load
Back electromotive
force
+
-
ON
OFF
Y0
Y1
COM-
IO24V
IO24G
[2]
[3]
D1
Load
Load
Source output
Back electromotive
force
[1] Shut off
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