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

Secure loads held by the brake!
Since this procedure cancels the "Brake active" signal which, in turn, causes the brake to
be forced open, the user must ensure that, even when the motor has been powered-down,
all loads held by the brake are secured before the signal is canceled.
Table 5- 56
Parameter
P0003 = 3
P1218 = 1
5.10.2

Automatic restart and flying restart

5.10.2.1

Flying restart: switching on the converter when the motor is running

Description
The "flying restart" function, which is activated by P1200, allows the inverter to be switched
to a rotating motor. The function must be used whenever a motor may still be running. This
could be:
● After a brief line interruption
● When an inverter is shut down but air currents cause a fan impeller to rotate (either CW
● If the motor is driven by a load
This function is useful, therefore, with motors whose load exhibits a high moment of inertia
since it can help prevent sudden loads in the mechanical components.
If this function is not used in such cases, this could cause the motor to shut down due to
overcurrent (overcurrent fault F0001).
The "flying restart" function can be used to synchronize the inverter and motor frequency.
Drive starts automatically
When this function is enabled (P1200 > 0), all those working with the system must be
informed of the following:
• The drive starts automatically.
• Although the drive is at a standstill, it can be started by the search current.
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA
WARNING
Parameter to force open a motor holding brake
Description
Enable expert access to parameters
Forcibly open the motor holding brake
or CCW)
WARNING
Functions
5.10 Technological functions
139