Siemens SINAMICS G120XA, Operating Instructions Manual, Page: 492 / 918

Description: Sets the signal source to enable the "flying restart" function.
Dependency: See also: 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 Calculated: - Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: -
Min:
10 [%] Max:
400 [%] Factory setting:
100 [%]
Description: Sets the search current for the "flying restart" function.
The value is referred to the motor magnetizing current.
Dependency: See also: 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.
p1203[0...n] Flying restart search rate factor / FlyRst v_Srch Fact
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: -
Min:
10 [%] Max:
4000 [%] Factory setting:
100 [%]
Description: Sets the factor for the search speed for flying restart.
The value influences the rate at which the output frequency is changed during a flying restart . A higher value results
in a longer search time.
Recommendation: For sensorless vector control and motor cables longer than 200 m, set the factor p1203 >= 300 %.
CAUTION
An unfavorable parameter value can result in the motor behaving in an uncontrollable fashion.
For vector control, a value that is too low or too high can cause flying restart to become unstable.
Parameters
7.3 Parameters
SINAMICS G120XA converter
490
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB