Automatic Switch-On - Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual

7.9.2.2

Automatic switch-on

The automatic restart includes two different functions:
1. The inverter automatically acknowledges faults.
2. After a fault occurs or after a power failure, the inverter automatically switches-on the
This automatic restart function is primarily used in applications where the motor is controlled
locally via the inverter's inputs. In applications with a connection to a fieldbus, the central
control should evaluate the feedback signals of the drives, specifically acknowledge faults or
switch-on the motor.
A power failure is defined by one of the two following events:
● The power supply of the Power Module has failed (fault F30003, undervoltage in the DC
● The 24 V power supply of the CU has failed.
Commissioning the automatic restart
● If it is possible that the motor is still rotating for a longer period of time after a power
● Using p1210, select the automatic restart mode that best suits your application.
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
motor again.
link).
WARNING
When the "automatic restart" function is active (p1210 > 1), the motor automatically
starts after a power failure. This is especially critical after longer power failures.
Reduce the risk of accidents in your machine or system to an acceptable level by
applying suitable measures, e.g. protective doors or covers.
failure or after a fault, then in addition, you must activate the "flying restart" function, see
Flying restart – switching on while the motor is running (Page 203).
Figure 7-16 Selecting the automatic restart mode
Functions
7.9 Technological functions
205