schererent
Member
I have been fighting with the tuning of this PID loop for a week. Never had this much trouble before, but I am not a PID wiz, so anyones suggestions will be appreciated. PLC is a GE Fanuc Versamax Micro, programmed with Versapro. Application is control of irrigation system pressure via a submersible pump in a tank and a vfd controlled by the analog output of the plc. I am faulting on low pressure (drive not ramping up to meet demand), but I am having trouble finding a happy place where it doesn't just run away and overshoot.
Tuning Parameters block set up as follows:
P-3.50
D-0
I-0
sample period-0
bias-0
Db upper and lower-0
Up clamp-32000
Low Clamp-16000
Error term-SP-PV
Min slew-0
Deriv. action-Error
Output action-Positive
Help!
Scott
Tuning Parameters block set up as follows:
P-3.50
D-0
I-0
sample period-0
bias-0
Db upper and lower-0
Up clamp-32000
Low Clamp-16000
Error term-SP-PV
Min slew-0
Deriv. action-Error
Output action-Positive
Help!
Scott