Siemens SINAMICS G120P, Operating Instructions Manual

Page: 405 / 496

Functions
7.7 Application-specific functions
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
405
● Two setpoint / actual value pairs as maximum value control (cooling)
The maximum value control compares two setpoint / actual value pairs and controls the
actual value which has the largest deviation upwards from its associated setpoint. No
control takes place if both actual values lie below their setpoints.
In order to avoid frequent switchover, the inverter only switches over if the deviation of
the controlled setpoint / actual value pair is more than two percent lower than the
deviation of the uncontrolled value pair.
● Two setpoint / actual value pairs as minimum value control (heating)
The maximum value control compares two setpoint / actual value pairs and controls the
actual value which has the largest deviation upwards from its associated setpoint. No
control takes place if both actual values lie above their setpoints.
In order to avoid frequent switchover, the inverter only switches over if the deviation of
the controlled setpoint / actual value pair is more than two percent lower than the
deviation of the uncontrolled value pair.
Switching from day to night mode
You can modify the setpoints for day and night mode individually. You have the following
opportunities to switch from day to night mode:
● Signal via a digital input, e.g. DI 4
● via p31025 with the aid of free components and the real-time clock
Note
If you activate the multi-zone control, the inverter switches its analog inputs as sources for
the setpoint and current value of the technology controller (refer to table).