When Module Ready Flag (Xn3) Does Not Turn On; When Feram Write Failure Flag (Xna) Is On; When Auto Tuning Does Not Start (When Auto Tuning Status Flag (Xn4, Xn5) Does Not Turn On); When Auto Tuning Does Not Complete (When Auto Tuning Status Flag (Xn4, Xn5) Remains To Be On And Does Not Turn Off) - Mitsubishi Electric MELSEC-Q Series User Manual

8 TROUBLESHOOTING

8.8 When Module Ready Flag (Xn3) Does Not Turn On

8.9 When FeRAM Write Failure Flag (XnA) Is On

8.10 When Auto Tuning Does Not Start (When Auto Tuning Status Flag (Xn4, Xn5) Does
Not Turn On)
8.11 When Auto Tuning Does Not Complete (When Auto Tuning Status Flag (Xn4, Xn5)
Remains to Be On and Does Not Turn Off)
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Check item
Has an error occurred on the programmable
controller?
Check item
Check item
Are start conditions for auto tuning met?
Has auto tuning been completed abnormally?
Check item
Is PID constant read/write completion flag
from FeRAM (buffer memory address: 31) set
to 1 (ON)?
Is PID constant read command from FeRAM
(buffer memory address: 62, 94) set to 1 (With
command)?
Is the set value (SV) set correctly? (Does the
manipulated value (MV) remain 0% since the
set value (SV) is small?)
Action
Refer to the user's manual for the
programmable controller CPU module used
and handle it.
Action
Execute writing into FeRAM again.
If FeRAM write failure flag (XnA) does not turn
off, it represents the Q62HLC hardware
failure.
Please consult your local Mitsubishi
representative.
Action
Check whether all the conditions are met with
referring to Section 3.2.1 (2) (a).
Check whether the auto tuning has completed
abnormally with referring to Section 3.2.1 (2)
(d).
Action
Set 0 (OFF) to Automatic backup setting after
auto tuning of PID constants (buffer memory
address: 63, 95), and turn off PID constant
read/write completion flag from FeRAM (buffer
memory address: 31).
Set PID constant read command from FeRAM
(buffer memory address: 62, 94) to 0 (Without
command).
Set arbitrary control value to the set value
(SV).
MELSEC-Q
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