Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-R Series User Manual

3.3

Troubleshooting by Symptom

When 'Module READY flag' (X0) does not turn ON
When 'Module READY flag' (X0) does not turn ON, check the following items:
Check item
Has a watchdog timer error occurred?
Has an error occurred in the CPU module?
When 'Error flag' (X2) is ON
When 'Error flag' (X2) is ON, check the following items:
Check item
Has an error occurred?
When 'Hardware error flag' (X3) is ON
When 'Hardware error flag' (X3) is ON, check the following items:
Check item
Is the cold junction temperature compensation
resistor disconnected or loose? (for the
R60TCTRT2TT2 and the R60TCTRT2TT2BW only)
Other than above
When the auto tuning does not start
When the auto tuning does not start (CH Auto tuning status (X4 to X7) does not turn ON), check the following items:
Check item
Have the auto tuning start conditions been met?
Has the auto tuning ended abnormally?
When the auto tuning is not completed
When the auto tuning is not completed (CH Auto tuning status (X4 to X7) remains ON and does not turn OFF), check the
following items:
Check item
Is Memory's PID constants write completion flag ON?
Has CH Memory's PID constants read command been set to Requested
(1)?
Has a correct set value (SV) been set? (Is the manipulated value (MV) still 0%
because the set value (SV) is small?)
3 TROUBLESHOOTING
144
3.3 Troubleshooting by Symptom
Corrective action
• Reset the CPU module or turn ON the power supply again.
• Replace the temperature control module.
Refer to the MELSEC iQ-R CPU Module User's Manual (Application).
Corrective action
Check Latest error code, and take a corrective action described in List of Error Codes. ( Page 146
List of Error Codes)
Corrective action
Properly connect the cold junction temperature compensation resistor.
A hardware failure has occurred in the temperature control module.
Please contact your local Mitsubishi Electric sales office or representative.
Corrective action
Refer to Auto Tuning Function and check whether all the conditions have been met. ( Page 38 Auto
Tuning Function)
Refer to Conditions where auto tuning ends abnormally and check whether the auto tuning has ended
abnormally. If it has ended abnormally, remove the cause. Then execute auto tuning again. ( Page
38 Auto Tuning Function)
Corrective action
Set CH Automatic backup setting after auto tuning of PID constants to
Disable (0) and turn OFF Memory's PID constants write completion flag.
Set CH Memory's PID constants read command to Not requested (0).
Set the set value (SV) to the desired value.