Automatic Restart And Flying Restart; Flying Restart: Switching On The Converter When The Motor Is Running - Siemens Sinamics G120 CU240E Operating Instructions Manual

Functions
5.10 Technological functions
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 converter 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 a converter 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 converter 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.
Input values
Table 5- 40
Parameter Description
P1200 =
...
138
or CCW)
WARNING
Main function parameters
Flying restart
0: Inactive (factory setting),
1 - 6 Active
Frequency inverter
Operating Instructions, 08.10. 2008, t.b.d.