Multi-Zone Control - Siemens SINAMICS G120 Original Instructions Manual

Setting functions
8.7 Application-specific functions
8.7.13

Multi-zone control

Multi-zone control is used to control quantities such as pressure or temperature via the
technology setpoint deviation. The setpoints and actual values are fed in via the analog
inputs as current (0 ... 20 mA) or voltage (0 ... 10 V) or as a percentage via temperature-
dependent resistances (LG-Ni1000 / Pt1000, 0 °C = 0%; 100 °C= 100%).
Control variants for multi-zone control
There are three control variants for multi-zone control, which are selected via p31021:
● One setpoint and one, two or three actual values
The actual value for the control can be calculated as mean value, maximum value or
minimum value by the inverter. You can find all of the setting options in the parameter list
in parameter p31022.
– Average value: The deviation from the setpoint of the average value of two or three
– Minimum value: The deviation from the setpoint of the smallest actual value is
● 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 changeover, 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. The
control pauses if both actual values lie above their setpoints.
The control 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 the digital input 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).
302
actual values is controlled.
controlled.
– Maximum value: The deviation from the setpoint of the highest actual value is
controlled.
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG