If no flow is detected, the adjustable frequency drive will increase the setpoint for pressure to ensure a slight
overpressure 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 per-
centage below the normal setpoint for pressure (Pset), the motor will ramp up again and pressure will be
controlled for reaching the set value (Pset).
2) In systems where the pressure or temperature is controlled by an external PI controller, the wake-up condi-
tions cannot be based on feedback from the pressure/temperature transducer as the setpoint is not known. In
the example with a boost system, desired pressure Pset is not known. par.1-00
Configuration Mode must be set
for Open-loop.
Example: Boost system.
4-188 TR200 Programming Guide
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