Automatic Restart And Flying Restart; Flying Restart - Switching On While The Motor Is Running - Siemens SINAMICS G120 Original Instructions Manual

Setting functions
8.7 Application-specific functions
8.7.4

Automatic restart and flying restart

8.7.4.1 Flying restart – switching on while the motor is running
If you switch on the motor while it is still running, then with a high degree of probability, a
fault will occur due to 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 flow of air turns the fan impeller.
● A load with a high moment of inertia drives the motor.
After the ON command, the "flying restart" function initially synchronizes the inverter output
frequency to the motor speed and then accelerates the motor up to the setpoint.
Figure 8-24
Setting "flying restart" function
If the inverter simultaneously drives several motors, then you must only use the "flying
restart" function if the speed of all of the motors is always the same (group drive with a
mechanical coupling).
Table 8- 28
Parameter Description
p1200
284
Principle of operation of the "flying restart" function
Basic setting
Flying restart operating mode (factory setting: 0)
0 Flying restart is locked
1 Flying restart is enabled, search for the motor in both directions, start in direction of
setpoint
4 Flying restart is enabled, only search in direction of setpoint
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG