Automatic Switch-On - Siemens SINAMICS G120 CU230P-2 HVAC Operating Instructions Manual

7.9.3.2

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.
The inverter interprets the following events as power failure:
● The inverter signals fault F30003 (DC link undervoltage), as the line supply voltage of the
● The inverter power supply has failed for a long enough time so that the inverter has been
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.
Figure 7-16 Selecting the automatic restart mode
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
motor again.
inverter has briefly failed.
switched-off.
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 237).
7.9 Application-specific functions
Functions
239