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Functions, monitoring and protective functions
9.3 Drive functions
Fast flying restart (only for induction motors)
The "Fast flying restart" function can be activated during operation without encoder (vector
control, V/f control linear and parabolic). For a fast flying restart, the initial frequency is set to
zero.
In this procedure, the flying restart function is performed successfully within a period of
approximately 200 ms.
The fast flying restart function works only under the following conditions:
● With a current regulator cycle time of 250 μs or 400 μs (without motor-side filter and
without long cables)
● Up to 4x rated speed for vector control
● Up to the rated speed for V/f control
Note
The "Fast flying restart" function is only possible with induction motors.
The settings for fast flying restart are configured in the expert list.
1. The "Fast flying restart" procedure is selected by setting p1780.11 = 1.
For operation with encoder, the settings of this bit are ignored, because no fast flying
restart is possible here.
2. Fast flying restart is activated using the p1200 parameter, as with the normal flying
restart.
3. For the determination of the line resistance, a motor data identification must be carried
out at standstill (p1900 = 2).
The critical parameters are the motor stator resistance (p0350) and the motor stator
leakage inductance (p0356).
The fast flying restart condition codes are the following:
● For V/f control: r1204.14 (fast flying start activated).
● For vector control: r1205.16 (fast flying restart activated) or r1205.17 (fast flying restart
finished).
Note
Search current must not be too small
If you have any problems with the fast flying restart it can be useful to set the search current
(p1202) to values > 30%. Problems can occur if the drive is operated far into the field
weakening, or if it is operated with motor-side filters or long lines.
530
Operating Instructions, 12/2018, A5E36652151A
Enclosed Drives
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