271
Advanced Function Setting Level Section 5-10
• The change width can be found for PV input values in any set period. Dif-
ferences with previous values in each set period are calculated, and an
alarm is output if the results exceed the alarm value.
• The PV rate of change calculation period can be set in units of 60 ms
(sampling period).
â– Related Parameters
Process value, Process value/set point (operation level): Page 177
Alarm 1 to 3 type, (Initial setting level): Pages 231, 233, 234.
• By setting the Automatic Cooling Coefficient Adjustment parameter to
ON, autotuning can be executed during heating/cooling control to auto-
matically calculate the cooling coefficient at the same time as the PID
parameters. If there is strong non-linear gain for the cooling characteris-
tics, such as when cooling water boils for cooling control, it may not be
possible to obtain the optimum cooling coefficient with this function, and
control may take the form of oscillating waves. If that occurs, increase the
proportional band or the cooling coefficient to improve control.
â– Related Parameters
PID * cooling coefficient (PID setting level): Page 219
pvrp PV Rate of Change Calculation Period
Alarms 1, 2, and 3 must be assigned.
The alarm type must be set to 13.
Setting range Unit Default
1 to 999 Sampling period 17 (= 17 × 60 ms = 1020 ms)
Function
Setting
See
See
csca
Automatic Cooling Coefficient Adjust-
ment
The control must be set to heating/
cooling control and 2-PID control.
Setting range Default
on: Enabled, off: Disabled OFF
Function
Setting
See
See
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