Mitsubishi Electric RD77MS2 User Manual page 577

RD77MS status LED display
Online module RUN ●
ERR 
change
RUN 
ERR 
*1 When all axes are stopped or on standby, the AX LED turns OFF.
*2 When any of the axes is in operation, the AX LED turns ON.
*3 When an error occurs in any of the axes, the AX LED is flashing.
When the RUN LED turns off
Check item
Is the power supplied for the power supply module?
Is the LED of the power supply module turned on?
Is the power supply capacity sufficient?
Is the module connected with the base unit correctly?
If there is no problem on the above check items, a hardware failure may have occurred. Reset the CPU module and check
that the RUN LED turns on.
If not, the possible cause is a hardware failure. Please consult your local Mitsubishi representative, explaining a detailed
description of the problem.
When the ERR LED flashes
Check item
Is there a moderate error?
When the ERR LED turns on and AX LED flashes
Check item
Is there a minor error?
When the ERR LED turns on
Check item
Is there a synchronous encoder axis error?
Other than those above
Reset the CPU module and check that the module is in the normal status.
If the status is not changed, the possible cause is a hardware failure. Please consult your local Mitsubishi representative,
explaining a detailed description of the problem.
Description
AX1 
Module remove selection in
AX2 
operation
AX3 
AX4 
AX1-8 
AX1-16 
AX1 
Module change in
AX2 
operation
AX3 
AX4 
AX1-8 
AX1-16 
Action
Check that the voltage supplied to the power supply module is within the rated range.
If the LED is not turned on, refer to the following.
MELSEC iQ-R CPU Module User's Manual (Application)
Calculate the total current consumption of the modules connected with the base unit (CPU
module, I/O modules, and intelligent function modules) and check that the power supply
capacity is not insufficient.
Check the state of connection with the module.
Action
• An error may have occurred in the CPU module. Check the error occurred in the CPU
module and take a corrective action.
• A hardware failure may have occurred. Reset the CPU module and check that the RUN LED
turns on. If not, the possible cause is a hardware failure. Please consult your local Mitsubishi
representative, explaining a detailed description of the problem.
Action
Check the error code and take a corrective action.
Action
Check the error code and take a corrective action.
Remedy

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14.1 Troubleshooting Procedure
14 TROUBLESHOOTING
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