Flying Restart - Switching On While Motor Is Running - Siemens SINAMICS G220 Operating Instructions Manual

Functions
14.11 Drive functions
p1212
p1213[0...1]
14.11.13

Flying restart - switching on while motor is running

Overview
If you switch on the motor while it is still rotating, a fault due to overcurrent (F30001 or F07801)
is highly likely unless the "Flying restart" function is used.
Examples of applications involving an unintentionally rotating motor directly before
switching on:
• The motor is rotating after a brief power interruption.
• A flow of air is turning a fan impeller.
• A load with a high moment of inertia is driving the motor.
Requirement
Permissible drives:
• Single drive
• Mechanically coupled group drive
Group drive without mechanical coupling is not permissible.
Description of function
The converter determines the motor speed continuously during the "Flying restart" function.
Following the ON command, the converter synchronizes its output frequency with the
motor speed and magnetizes the motor. The converter sets its output frequency to 0 Hz
for magnetization at motor speeds < 10% of the rated speed. If it is not possible to start in
this range, p1270.2 activates a supportive search technique.
Figure 14-197
Parameters
The following list contains the parameters of the "Flying restart" function.
612
Automatic restart wait time, acknowledgment and start
attempt
Automatic restart monitoring time
Principle of operation of the "Flying restart" function
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
[s]
[s]
SINAMICS G220 converter