IMO Precision Controls K7 Series User Manual page 219

Chapter 11. Troubleshooting
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Are the indicator LED of the
switch 1 and 2 on?
Yes
Check the status of the switch
1and 2
Is input wiring correct?
No
Yes
Separate the external wiring witch then
check the status by forced input
Correct the wiring
No
Unit replacement is
needed
No
Check the status of the switch
1and 2
.
Is input wiring correct?
No
Yes
Is input wiring correct?
Correct wiring
Yes
Check the status of the switch
1and 2
Yes
No
Retighten the terminal
screw
Check from the beginning
11-６
Is the
terminal screw tighten
securely?
NO
Yes
Is the condition
of the terminal board connector
appropriate?
No
Replace the terminal
board connector
Unit replacement is
needed