Flying Restart - Siemens Sinamics G120P Operating Instructions Manual

7.7.4

Flying restart

If you switch the motor on 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 a
motor already rotating 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 determines the actual motor speed and
accelerates the motor up to the setpoint.
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 7- 29
Parameter Description
p1200
p1201
r1204
r1205
p0247
p1780
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
Parameter
Flying restart operating mode (factory setting: 0)
0: Flying restart is inactive
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
Flying restart enable signal source (factory setting: 1)
Defines a control command, e.g. a digital input, through which the flying restart function
is enabled.
Flying restart V/f control status
Monitoring parameters for the flying restart in the V/f control mode
Flying restart vector control status
Monitoring parameters for flying restart in the vector control mode
Voltage measurement configuration
5: Utilize the voltage measured values for flying restart (factory setting: 1)
Motor model adaptation configuration
11: Fast flying restart with the voltage model for induction motors (factory setting: 1)
7.7 Application-specific functions
Functions
385