Siemens SINAMICS G120 Operating Instructions Manual page 192

Advanced commissioning
6.1 Overview of the inverter functions
You can select in which physical units the inverter represents its associated values.
In an emergency, the inverter deactivates its protection functions in order to maintain drive
operation as long as possible.
Setpoints and setpoint conditioning
The setpoint generally determines the motor speed.
The setpoint processing uses a ramp-function generator to prevent speed steps occurring and
to limit the speed to a permissible maximum value.
Technology controller
The technology controller controls process variables, e.g. pressure, temperature, level or flow.
The motor closed-loop control either receives its setpoint from the higher-level control - or from
the technology controller.
The inverter has three additional technology controllers that operate independently of each
other.
The multi-zone control offers various procedures to process multiple setpoints or actual values
with only one technology controller.
The cascade control is ideal for applications in which, for example, significantly fluctuating
pressures or flow rates are equalized.
The "time switch", together with the real-time clock, offers the option of controlling when signals
are switched on and off.
Motor control
The motor closed-loop control ensures that the motor follows the speed setpoint. You can
choose between various control modes.
The inverter has various methods to electrically brake the motor. When electrically braking,
the motor develops a torque, which reduces the speed down to standstill.
192
Selecting physical units (Page 253)
Essential service mode (Page 245)
Setpoints (Page 258)
Setpoint calculation (Page 266)
PID technology controller (Page 274)
Free technology controllers (Page 282)
Multi-zone control (Page 284)
Cascade control (Page 288)
Real time clock (RTC) (Page 293)
Time switch (DTC) (Page 295)
Motor control (Page 296)
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE