Omron E5CN User Manual page 251

Advanced Function Setting Level
pvrp
PV Rate of Change Calculation Period
Function
Setting
See
See
Automatic Cooling Coefficient Adjust-
csca
ment
Function
Setting
See
See
226
• 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 250 ms
(sampling period).
Setting range
1 to 999
■ Related Parameters
Present value, Process value/set point (operation level): Page 149
Alarm 1 to 3 type, (Initial setting level): Pages 191 to 193
• 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 at the Controller, and
control may take the form of oscillating waves. If that occurs, increase the
proportional band or the cooling coefficient to improve control.
Setting range
on: Enabled, off: Disabled
■ Related Parameters
Cooling coefficient (adjustment level): Page 173
Alarms 1, 2, and 3 must be assigned.
The alarm type must be set to 13.
Unit
Sampling period
The control must be set to heating/
cooling control and 2-PID control.
Default
OFF
Section 5-8
Default
4 (1 s)