There is a chilled water cooling loop in our process cooling a roller.
It has been about impossible to tune. this is in a tertiary loop. From the time valve opening it takes about 4 minutes for the slug of cold water to hit the transmitter. Transmitter is at the roll. Valve is about 200 feet away. From the start of a cycle is about 14
minutes from upset to the next upset. Best I can achieve is a 12 Deg. F.
swing in temp. I have tried a very good tuning software
but the settings it provided were so low it over temped the loop.
This is in a ControlLogix using a PIDE block. Flow rate is about 50 gpm
in a 2 inch line. Any ideas??
It has been about impossible to tune. this is in a tertiary loop. From the time valve opening it takes about 4 minutes for the slug of cold water to hit the transmitter. Transmitter is at the roll. Valve is about 200 feet away. From the start of a cycle is about 14
minutes from upset to the next upset. Best I can achieve is a 12 Deg. F.
swing in temp. I have tried a very good tuning software
but the settings it provided were so low it over temped the loop.
This is in a ControlLogix using a PIDE block. Flow rate is about 50 gpm
in a 2 inch line. Any ideas??