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

8.9.3

Automatic restart and flying restart

8.9.3.1 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 (overcurrent fault 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.
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- 35
Parameter Description
P1200
SINAMICS G120C Inverter
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
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, look for the motor in both directions, start in direction of
setpoint
4 Flying restart is enabled, only search in direction of setpoint
8.9 Application-specific functions
Functions
221