Filter
Top Products
184
(6) Conditions where auto tuning cannot be executed
If one of the following conditions applies, auto tuning cannot be executed.
(a) When one of the conditions 1 to 5 applies
Auto tuning starts when the condition no longer applies.
(b) When the condition 7 applies
Even though the temperature process value (PV) goes back within the temperature measurement range, auto
tuning does not start until CH Auto tuning instruction (Yn4 to Yn7) is turned on from off once again.
(c) When the condition 8 or 9 applies
Even though the internal processing of auto tuning is completed and PID constants are stored, CH Auto
tuning status (Xn4 to Xn7) does not turn off, therefore the auto tuning is not completed.
Conditions to start auto tuning Reference
1 The module is in the setting mode (Setting/operation mode status (Xn1): OFF). Page 50, Section 3.3.2 (2)
2
In standard control, CH Proportional band (P) setting (Un\G35, Un\G67, Un\G99, Un\G131) is set
to 0. (operating in two-position control)
Page 105, Section 3.4.2 (15)
In heating-cooling control, CH Heating proportional band (Ph) setting (Un\G35, Un\G67, Un\G99,
Un\G131) is set to 0. (operating in two-position control)
3CH AUTO/MAN mode shift (Un\G50, Un\G82, Un\G114, Un\G146) is set to MAN (1). Page 117, Section 3.4.2 (26)
4
Toward the corresponding channel, CH Unused channel setting (Un\G61, Un\G93, Un\G125,
Un\G157) is set to Unused (1).
Page 126, Section 3.4.2 (35)
5CH PID control forced stop instruction (YnC to YnF) is turned on. Page 58, Section 3.3.3 (7)
6 Hardware failure has occurred. (The ERR. LED is on.) Page 361, Section 8.3.2
7
CH Temperature process value (PV) (Un\G9 to Un\G12) has exceeded the temperature
measurement range (CH Input range upper limit (b0 of Un\G5 to Un\G8) or CH Input range
lower limit (b1 of Un\G5 to Un\G8) is 1 (ON)).
Page 87, Section 3.4.2 (3)
8
CH E
2
PROM's PID constants read instruction (Un\G62, Un\G94, Un\G126, Un\G158) is set to
Requested (1).
Page 127, Section 3.4.2 (36)
9CH Write completion flag (b4 to b7 of Un\G31) is on. Page 94, Section 3.4.2 (11)