Checking The Leds - Mitsubishi Electric NZ2GF2B1-16D User Manual

12.3

Checking the LEDs

This section describes how to troubleshoot the system by the LEDs.
(1) When the PW LED does not turn on
Check item
Is any LED other than the PW LED turned 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?
(2) When the I/O PW LED does not turn on
Check item
Is the external power supply (24VDC) wired?
Is the external power supply (24VDC) turned on?
Is the voltage of the external power supply (24VDC) within the
specified range?
(3) When the RUN LED does not turn on
Check item
Does the voltage of the module power supplied externally reach to the
voltage of the specifications?
Does any hardware error occur?
(4) When the MODE LED flashes
Check item
Is the I/O module in execution of the unit test?
When any LED other than the PW LED turns 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 voltage value within the range of performance specifications.
Wire the external power supply (24VDC).
Turn on the external power supply (24VDC).
Set the voltage value within the range of performance specifications.
Check that module power supply voltage is within the range of performance
specifications.
( Page 35, Section 4.2)
After the check, power off and on the module.
If the RUN LED does not turn on even after the module power supply is turned off and
on, the possible cause is a module failure. Please consult your local Mitsubishi
representative.
When the 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.
( Page 246, Section 12.4)
CHAPTER 12 TROUBLESHOOTING
Action
Action
Action
Action
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