Справочник Пользователя для Mitsubishi Electronics Q25HCPU

 

 

 

11 - 5                                                                                                                                                       11 - 5 

MELSEC-Q

 

11   TROUBLESHOOTING 

 

11.2.4 Flowchart for when the "POWER" LED is turned off 

The following shows the flowchart to be followed when the "POWER" LED of the 

power supply module turns off at PLC power-on or during operation. 

 

"POWER" LED is turned off.

Please consult your local Mitsubishi 
service center or representative, 
explaining a detailed description 
of the problem.

Is there a power supply?

Supply power.

Can "POWER" LED

be turned on?

The supply voltage should be within
the rated range.

Can "POWER" LED

be turned on?

Properly fix the power supply module.

Is the power supply

module fixed?

1) Check the electric-current capacity
    and reduce the amount of overcurrent.
2) Turn OFF the input power and wait 
    several minutes before turning it ON 
    again.

Is overcurrent

protection and overvoltage

protection working?

Completion

NO

YES

NO

YES

YES

NO

YES

NO

YES

NO

YES

NO

NO

NO

YES

YES

Can "POWER" LED

be turned on?

Can "POWER" LED

be turned on?

Is the power 

supply voltage within the

voltage range given in the

specifications?