Siemens SINAMICS G150 Operating Instructions Manual page 498

Functions, monitoring, and protective functions
9.2 Drive functions
Flying restart without encoder for long cables
In the case of long motor cables, the procedure described above can lead to problems
during a flying restart. In such cases, the following settings can improve the flying restart
function:
● Enter the cable resistance in parameter p0352 before motor data identification.
● Set parameter p1203 to at least 300%.
With this setting, flying restart takes longer than for values below 300%.
Note
Optimize the flying restart function
To optimize the flying restart, a trace recording should check the function. If necessary, you
can improve the result by making settings for parameters p1202 and p1203.
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 fast flying restart the starting frequency is set to
zero.
In this procedure, the flying restart function is performed successfully for 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).
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Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A