Trane TR200 Series Programming Manual page 218

Parameter Description
2) In systems where the pressure or temperature is controlled by an external PI controller, the wake up conditions
can not 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.
When low power or low speed is detected the motor is stopped, but the reference signal (f ref ) from the external
controller is still monitored and because of the low pressure created, the controller will increase the reference
signal to gain pressure. When the reference signal has reached a set value f wake the motor restarts.
TR200 Programming Guide 217