Fast Flying Restart - Siemens SINAMICS S120 Function Manual

Flying restart in encoderless operation for long cables
As a rule, it is important to consider the cable resistance. The cable resistance is required for
calculation of the thermal motor model.
1. Enter the cable resistance in parameter p0352 before you perform motor data
2. Set parameter p1203[0...n] to at least 300%.
Note
Use a trace recording to check and optimize the flying restart function. If necessary, optimize
the settings of parameters p1202 and p1203.
5.17.1

Fast flying restart

For encoderless operation (vector, V/f linear and parabolic), there is a "fast flying restart".
The "fast flying restart" function is only possible for induction motors.
Fast flying restart without voltage measurement
For fast flying restart without voltage measurement, the starting frequency is set to zero. The
model settles within approximately 200 ms on its own when the parameterization is correct.
This fast flying restart works only under the following conditions:
● At a current controller cycle time of 250 μs or 400 μs (without filter and long cables)
● Up to 4x the rated speed for vector control
● Up to the rated speed for V/f control
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
identification.
This operation can take a little longer than for the factory setting (100%).
Vector control
5.17 Flying restart
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