MICROMASTER 4, SINAMICS G120:取反PID实际值

For some applications, for example a cooling fan or discharge pump, it is necessary to invert the actual value of the technology controller (PID controller) so that the drive increases the output speed when the PID actual value increases.

How can the control sense of the PID controller be inverted for MICROMASTER 4 / SINAMICS G120 inverters?

Parametrization for MICROMASTER 4 and SINAMICS G120 (independent of the firmware) as follows:

1. Is applicable for SINAMICS G120/G120C/G120D/G120P inverters with Control Units with with a “-2” in the product name:
   For SINAMICS G120 inverters, the control sense is inverted by reversing the sign of the control difference in parameter p2306 "Technology controller fault signal inversion ". As a result of the conversion, the setpoint is subtracted from the actual value.
2. Valid for SINAMICS G120/G120D inverters with Control Units without a “-2” in their product name, and for MICROMASTER 4 inverters:
   As parameter p2306 for SINAMICS G120/G120D inverters with Control Units CU240S/D and MICROMASTER 4 does not exist, for these inverters, the control sense is inverted by interchanging the setpoint and actual value (p2253 = actual value, p2264 = setpoint). The setpoint is subtracted from the actual value as a result of this interchange.
   

Note
For details on this topic, see the application example „SINAMICS G120/G120P: Process controls with the technology controller" in Chapter 3, Section 3.1.4 „Technology controller“ entry ID: 92556266

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