1) Systems where the integrated PI controller is used for controlling pressure or temperature e.g. boost systems with a pressure feed back signal applied

to the frequency converter from a pressure transducer. Par. 1-00,

desired reference and feed back signals.

Example: Boost system.

If no flow is detected, the frequency converter will increase the set point for pressure to ensure a slight over pressure in the system (boost to be set in

par. 22-45,

Setpoint Boost

The feedback from the pressure transducer is monitored and when this pressure has dropped with a set percentage below the normal set point for

pressure (Pset), the motor will ramp up again and pressure will be controlled for reaching the set value (Pset).

Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com

http://www.remotesiteproducts.com/p-20772-Danfoss-131X8135-VLT-Automation-VT-Drive-VFD-FC322-230V-5-HP.aspx

=frequency out; P

MG.20.W1.22 - VLT is a registered Danfoss trademark

=P system; P

=P setpoint

Configuration Mode

, must be set for Closed Loop and the PI Controller configured for