219
PID Setting Level Section 5-6
If the heating and cooling characteristics of the control object are very differ-
ent and good control characteristics cannot be achieved with the same PID
constants, the cooling coefficient can be used to adjust the proportional band
(P) for the control output assigned to the cooling side. One parameter is set
for each PID set.
• In heating/cooling control, the proportional band P for the cooling control
output is calculated using the following formula to set the cooling coeffi-
cient:
Cooling control output side P = Cooling coefficient × P (proportional band)
• The cooling coefficient will be set automatically if autotuning is executed
when the Automatic Cooling Coefficient Adjustment parameter is set to
ON. The execution results will be saved in the PID set where autotuning
was started. If non-linearity is strong in the cooling characteristics, how-
ever, this function may not find the optimum cooling coefficient.
â– Related Parameters
PID (*) proportional band (PID setting level): Page 217
These parameters set whether the LBA function is to be enabled or disabled
and sets the time interval for detection, for each PID set.
• These parameters set the time interval for detecting the LBA.
• Setting 0 disables the LBA function.
• For ON/OFF control, make the setting in the LBA Detection Time parame-
ter in the advanced function setting level.
â– Related Parameters
Alarm 1 type (initial setting level): Page 231
LBA level (advanced function setting level): Page 259
LBA band (advanced function setting level): Page 260
*.csc
PID * Cooling Coefficient
(*: 1 to 8)
Heating and cooling control and 2-
PID control must be used.
Setting range Unit Default
0.01 to 99.99 None 1.00
Function
Settin
See
See
*.lba
PID * LBA Detection Time
(*: 1 to 8)
2-PID control must be used.
Alarm 1 must be assigned.
The alarm 1 type must be 12 (LBA).
Setting range Unit Default
0 to 9999 s 0
Function
Settin
See
See
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