I am trying to control the pressure in an enclosed spraybooth cabin using VSD's. The system uses Benshaw's variable speed drives and are controlling a 15Hp intake AC motor and a 15HP exhaust AC motor.
The pressure is being monitored using a Setra pressure transmitter
http://www.setra.com/tra/pro/p_hv_265.htm
which provides a 4-20mA signal which is then fed back to an analog card (FP0-A21) on a NAIS FP Sigma PLC. The output of the analog card is then fed into the analog input of the Exhaust VSD which will control the speed of the exhaust motor. The Intake drive will be running at a constant speed, and only the exhaust drive speed will vary according to the speed of the intake drive and filter clogging.
At all times, the cabin pressure is to be balanced (no positive and no negative pressure).
Any thoughts or ideas will be extremely helpful.
TamHo
The pressure is being monitored using a Setra pressure transmitter
http://www.setra.com/tra/pro/p_hv_265.htm
which provides a 4-20mA signal which is then fed back to an analog card (FP0-A21) on a NAIS FP Sigma PLC. The output of the analog card is then fed into the analog input of the Exhaust VSD which will control the speed of the exhaust motor. The Intake drive will be running at a constant speed, and only the exhaust drive speed will vary according to the speed of the intake drive and filter clogging.
At all times, the cabin pressure is to be balanced (no positive and no negative pressure).
Any thoughts or ideas will be extremely helpful.
TamHo