Mitsubishi Electronics Q64TCTTN ユーザーズマニュアル

364

When the auto tuning does not complete (CH Auto tuning 
status (Xn4 to Xn7) stays on and does not turn off)

When the self-tuning does not start (CH Auto tuning status 
(Xn4 to Xn7) does not turn on)

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). (

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). (

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.

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.

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?