Q Series Safety Relay Module; Error Check Method With Led - Mitsubishi Electric MELSEC Q Series User Manual

6
TROUBLESHOOTING
(3) Narrowing down the trouble cause
Guess the failure location to any of the following by checking (1) and (2) above.
6.1

Q Series Safety Relay Module

6.1.1

Error check method with LED

Table 6.1 shows description, cause investigation, and corrective action of errors
depending on LED display on the module.
LED signal
PW S PW ERR. Z
* * *
*
* * *
1) Safety relay module or external device?
2) Main module, extension module or another module?
3) Programmable controller?
4) Sequence program?
Table 6.1 Error handling of safety part with LED
K1 K0 X1 X0
Main module
Main module
The safety part power supply is not
* * * *
normally supplied.
The module power supply is not
* *
normally supplied.
Contact welding of K0 and K1 relays
K0 and K1 relays do not turn ON.
* *
Safety system 1 does not turn ON.
* *
Safety system 2 does not turn ON.
Safety system 1 does not turn
OFF.
Safety system 2 does not turn
OFF.
•System error occurred.
•No power supply on safety side
* * * * •Extension module communication
has not established.
•Extension module is disconnected.
* 1: The status that start-up processing has been performed to the module
Cause
Normal
Normal
*1
*1
*1
*1
*1
6.1 Q Series Safety Relay Module
6.1.1 Error check method with LED
Corrective action
A display when the module does not
start
A display when the module starts
•Check if the power supply is
normally supplied.
•Check between the power supplies
for short.
•In case of input N type, check
between the dual inputs for short.
•Check if the power supply is
normally supplied.
•Check between the power supplies
for short.
•Replace the module.
•Check if the power supply is
normally supplied.
•Check between the power supplies
for short.
•Check if the extension module is
normally connected.
: ON, : OFF, *: ON or OFF
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