Siemens Sinamics G120 CU240E Operating Instructions Manual page 82

Functions
5.1 Overview of inverter functions
Functions relevant to all applications
①
②
③
④
⑤
Functions required in special applications only
⑥
⑦
⑧
⑨
⑩
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Inverter control is responsible for all of the other frequency inverter functions. Among
other things, it defines how the inverter responds to external control signals.
The command source defines whether the motor is powered-up and powered-down
via terminals (digital inputs) or a fieldbus.
The setpoint source defines how the speed setpoint is entered, e.g. via terminals
(analog input) or via a fieldbus.
The setpoint calculationuses a ramp-function generator to prevent speed steps
occuring and to limit the speed to a permissible maximum value.
The closed-loop control ensures that the motor follows the speed setpoint. It offers
both V/f control, which is easy to configure, and vector control, which is more
complex.
The motor and frequency inverter protection avoids overloads and operating states
that could cause damage to the motor and frequency inverter. The motor temperature
monitoring is, e.g. set here.
The technological functions allow you to activate a motor holding brake or implement
a higher-level pressure or temperature control using the technology controller, for
example.
The status messages provide binary and analog signals at the terminals or via the
fieldbus. Examples include the current speed of the motor or fault messages issued
by the inverter.
A connection to a fieldbus can be established via software tools in the control
systems. How this is carried out with a SIMATIC controller is described in a separate
section.
The safety functions are only available for fail-safe frequency inverters.
Frequency inverter
Operating Instructions, 08.10. 2008, t.b.d.