Siemens SINAMICS G120 List Manual page 213

Dependency: A differentiation is made between flying restart for U/f control and for vector control (p1300).
Flying restart, U/f control: p1202, p1203, r1204
Flying restart, vector control: p1202, p1203, r1205
For synchronous motors, flying restart cannot be activated.
Refer to: p1201
Refer to: F07330, F07331
Notice: The "flying restart" function must be used in cases where the motor may still be running (e.g. after a brief line supply
interruption) or is being driven by the load. The system might otherwise shut down as a result of overcurrent.
Note: For p1200 = 1, 4, the following applies:
Flying restart is active after faults, OFF1, OFF2, OFF3.
For p1200 = 1, the following applies:
The search is made in both directions.
For p1200 = 4, the following applies:
The search is only made in the setpoint direction.
For U/f control (p1300 < 20), the following applies:
The speed can only be sensed for values above approx. 5 % of the rated motor speed. For lower speeds, it is
assumed that the motor is at a standstill.
If p1200 is changed during commissioning (p0010 > 0), then it is possible that the old value will no longer be able to
be set. The reason for this is that the dynamic limits of p1200 have been changed by a parameter that was set when
the drive was commissioned (e.g. p0300).
p1201[0...n] BI: Flying restart enable signal source / Fly_res enab S_src
Access level: 3
Can be changed: T
Unit group: -
Min
-
Description: Sets the signal source to enable the "flying restart" function.
Dependency: Refer to: p1200
Note: Withdrawing the enable signal has the same effect as setting p1200 = 0.
p1202[0...n] Flying restart search current / FlyRest I_srch
Access level: 3
Can be changed: U, T
Unit group: -
Min
10 [%]
Description: Sets the search current for the "flying restart" function.
The value is referred to the motor magnetizing current.
Dependency: Refer to: r0331
Caution: An unfavorable parameter value can result in the motor behaving in an uncontrollable fashion.
Notice: The following applies for a synchronous reluctance motor:
The minimum search current is limited (p1202 >= 50 %).
Note: In U/f control mode, the parameter serves as a threshold value for establishing the current at the beginning of the
flying restart function. When the threshold value is reached, the actual search current is set as a function of the
frequency based on the voltage setpoints.
Reducing the search current can also improve flying restart performance (if the system moment of inertia is not very
high, for example).
The following applies for a synchronous reluctance motor:
Adjusting the search current only has an effect if a motor data identification run is then performed (see p1909 bit 22).
It is possible that a value exceeding 100% cannot be reached if the motor rated power is significantly less than that of
the power unit.
If the motor rated power is significantly higher than that of the power unit, then the search current should be
increased for the higher speed range.
SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890
Calculated: -
Scaling: -
Unit selection: -
Max
-
Calculated: -
Scaling: -
Unit selection: -
Max
400 [%]
2 Parameters
2.2 List of parameters
Data type: U32 / Binary
Dyn. index: CDS, p0170
Func. diagram: -
Factory setting
1
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: -
Factory setting
100 [%]
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