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8.4.5 When the auto tuning does not complete (CH Auto tuning
status (Xn4 to Xn7) stays on and does not turn off)
8.4.6 When the self-tuning does not start (CH Auto tuning status
(Xn4 to Xn7) does not turn on)
8.4.7 When E
2
PROM write failure flag (XnA) is on
Check Item Action
Are b4 to b7 of the E
2
PROM's PID constants read/write
completion flag (Un\G31) set to 1 (ON)?
Set CH Automatic backup setting after auto tuning of PID constants
(Un\G63, Un\G95, Un\G127, Un\G159) to Disable (0). ( Page 128,
Section 3.4.2 (37))
To back up the setting, turn off and on E
2
PROM backup instruction (Yn8).
Is CH E
2
PROM's PID constants read instruction (Un\G62,
Un\G94, Un\G126, Un\G158) set to Requested (1)?
Set CH E
2
PROM's PID constants read instruction (Un\G62, Un\G94,
Un\G126, Un\G158) to Not requested (0). ( Page 127, Section 3.4.2
(36))
Has the set value (SV) been set correctly? (Is the
manipulated value (MV) still 0% because the set value (SV)
is small?)
Set the set value (SV) to the desired value.
Check Item Action
Have the self-tuning start conditions been met?
Refer to the "Self-tuning function" section ( Page 223, Section 4.18)
and confirm that all conditions have been met.
Has self-tuning ended abnormally?
Check the conditions that signify an abnormal end for self-tuning
( Page 231, Section 4.18 (8)) to see whether it has ended abnormally.
If it has ended abnormally, remove the cause. If the buffer memory setting
was changed during self-tuning, restore the value to the one prior to
change.
Check Item Action
Has a backup to E
2
PROM failed? Turn off and on E
2
PROM backup instruction (Yn8) and write the setting to
the E
2
PROM.
If writing fails again, a hardware is in failure. Please consult your local
Mitsubishi representative.
Has the reading of data from E
2
PROM failed?