Functions
7.9 Technological functions
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
203
7.9.2 Automatic restart and flying restart
7.9.2.1 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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Figure 7-15 Principle of operation of the "flying restart" function
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- 33 Basic setting
Parameter Description
Flying restart operating mode (factory setting: 0) P1200
0
1
4
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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