Troubleshooting; When The Run Led Flashes Or Turns Off; When The Err. Led Turns On Or Flashes - Mitsubishi Electric MELSEC-Q series User Manual

11.3

Troubleshooting

11.3.1

When the RUN LED flashes or turns off

(1) When flashing
Check item
Is the operation in the offset/gain setting mode?
(2) When off
Check item
Is the power supplied?
Is the capacity of the power supply module sufficient?
Is there any watchdog timer error?
Is the module mounted on the base unit properly?
Is a module change enabled during an online module change?
11.3.2

When the ERR. LED turns on or flashes

(1) When on
Check item
Is there any error?
(2) When flashing
Check item
Is a value other than 0 set to Switch 5 of the intelligent function
module switch setting?
Action
• Set the operation mode in the intelligent function module switch
setting to the normal mode. Or reset the switch 4 in the intelligent
function module switch setting to the normal mode.
• Set the operation mode to the normal mode by setting Mode
switching setting (Un\G158, Un\G159); set Un\G158 to 0964
and Un\G159 to 4144 .
H
Action
Check that the supply voltage of the power supply module is within
the rated range.
Calculate the current consumption of the modules mounted on the
base unit, such as the CPU module, I/O module, and intelligent
function module, and check that the power supply capacity is
sufficient.
Reset the CPU module, and check if the RUN LED turns on.
If the RUN LED remains off, the CT input module might fail. Please
consult a local Mitsubishi representative.
Check the mounting condition of the module.
Refer to the following and take the corrective action.
• ONLINE MODULE CHANGE (
Action
Check the error code, and take the action described in the error
code list.
• Error code list ( Page 224, Section 11.1 (2))
Action
Set 0 to Switch 5 of the intelligent function module switch setting.
CHAPTER 11 TROUBLESHOOTING
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Page 180, CHAPTER 10)
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