Siemens SINAMICS G120C DP User Manual

8.28 Flying restart – switching on while the motor is running
Overview
If you switch on the motor while it is still rotating, without the "Flying restart" function,
there is a high probability that a fault will occur as a result of overcurrent (F30001 or
F07801). Examples of applications involving an unintentionally rotating motor directly before
switching on:
• The motor rotates after a brief line interruption.
• A 󹪞ow of air turns the fan impeller.
• A load with a high moment of inertia drives the motor.
Function description
The "Flying restart" function comprises the following steps:
1. After the on command, the converter impresses the search current in the motor and
increases the output frequency.
2. When the output frequency reaches the actual motor speed, the converter waits for the
motor excitation build up time.
3. The converter accelerates the motor to the actual speed setpoint.
212))
6SHHG
&RQYHUWHURXWSXW
IUHTXHQF\
7KHFRQYHUWHUPDJQHWL]HVWKH
PRWRU
W
W
Figure8-71 Principle of operation of the "󹪞ying restart" function
Parameter
Setting "󹪞ying restart" function
Parameter Description Factory setting
p1200[D] Flying restart operating mode 0
0 = 󹪞ying restart is inhibited
1 = Flying restart is enabled, search for the motor in both
directions, start in the direction of the setpoint
4 = Flying restart is enabled, search for the motor only in the
direction of the setpoint
Advanced commissioning
8.28Flying restart – switching on while the motor is running
SINAMICS G120C Converters
346 Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK

Siemens SINAMICS G120C DP Specifications

General

Brand	Siemens
Model	SINAMICS G120C DP
Category	Inverter
Language	English