Checking The Leds - Mitsubishi Electric NZ2GFSS2 32D S1 User Manual

10.2

Checking the LEDs

This section describes how to troubleshoot the system by the LEDs.
Depending on an LED status of the RUN LED, ERR. LED, or SAFETY LED, the error status can be judged as follows.
RUN LED ERR. LED
*2
Off On
On On
On Flashing
*1 When multiple errors have occurred, the error statuses are displayed in the order of error severity (Major error > Moderate error > Minor
error).
*2 When the module fails, the LED may not turn on.
*3 Either of Flashing or Off.
*4 Any of On, Flashing, or Off.
When the PW LED does not turn on
Check item
Is any LED other than the PW LED on?
Is the module power supply (24VDC) wired?
Is the module power supply (24VDC) turned on?
Is the voltage of the module power supply
(24VDC) within the specified range?
When the RUN LED does not turn on
Check item
Has the voltage of the module power supplied
externally reached the voltage of the
specifications?
Has a momentary power failure exceeding the
specifications occurred in the externally supplied
module power supply?
(Only for the NZ2GFSS2-32D-S1)
Has any hardware failure occurred?
When the MODE LED flashes
Check item
Is the safety remote I/O module in execution of the
unit test?
When the MODE LED turns off
Check item
Has any hardware failure occurred?
SAFETY LED Error status
*3
Major error
*3
Moderate error
*4
Minor error
Action
When any LED other than the PW LED is on, the possible cause is a hardware failure. Please consult
your local Mitsubishi representative.
Wire the module power supply (24VDC).
Turn on the module power supply (24VDC).
• Set the module power supply voltage within the range of performance specifications. ( Page 20
Performance Specifications)
• After performing the above action, power off and on the module power supply. If the PW LED does not
turn on even after the module power supply is powered off and on, the possible cause is a module
failure or the activation of the overvoltage protection function. Please consult your local Mitsubishi
representative.
Action
• Check that module power supply voltage is within the range of performance specifications. ( Page
20 Performance Specifications)
• After the check, power off and on the module power supply. If the RUN LED does not turn on even after
the module power supply is powered off and on, the possible cause is a module failure. Please consult
your local Mitsubishi representative.
• Check that a momentary power failure exceeding the specifications has not occurred in the module
power supply. ( Page 20 Performance Specifications)
• After the check, power off and on the module power supply. If the RUN LED does not turn on even after
the module power supply is powered off and on, the possible cause is a module failure. Please consult
your local Mitsubishi representative.
Power off and on the module power supply. If the RUN LED does not turn on even after the module power
supply is powered off and on, the possible cause is a module failure. Please consult your local Mitsubishi
representative.
Action
When the safety remote I/O module is in execution of the unit test, the D LINK LED turns on after the unit
test is completed. Take corrective action according to the result of the unit test.
Action
Power off and on the module power supply. If the MODE LED does not turn on even after the module
power supply is powered off and on, the possible cause is a module failure. Please consult your local
Mitsubishi representative.
*1
Reference on errors
Page 138 Error codes related to the safety remote I/O module
10 TROUBLESHOOTING
123
10.2 Checking the LEDs
10