Siemens SINAMICS G120 Operations Instructions download pdf (Page 206)

Functions

7.9 Application-specific functions

Inverter with CU240B-2 and CU240E-2 Control Units

204 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

7.9.3 Automatic restart and flying restart

7.9.3.1 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.

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Principle of operation of the "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- 42 Basic setting

Parameter Description

Flying restart operating mode (factory setting: 0) P1200

Flying restart is locked

Flying restart is enabled, look for the motor in both directions, start in direction of

setpoint

Flying restart is enabled, only search in direction of setpoint

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Siemens SINAMICS G120 Operations Instructions Page 206