Siemens SINAMICS G120 List Manual page 248

2 Parameters
2.2 List of parameters
Dependency: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Refer to: p1749, p1756
Notice: The changeover speed represents the steady-state minimum speed up to which the motor model can be used in
sensorless steady-state operation.
If the stability is not adequate close to the changeover speed, it may make sense to increase the parameter value.
On the other hand, very low changeover speeds can negatively impact the stability.
Note: The changeover speed applies for the changeover between open-loop and closed-loop control mode.
p1756 Motor model changeover speed hysteresis encoderless operation /
MotMod n_chgov hys
Access level: 3
Can be changed: U, T
Unit group: -
Min
0.0 [%]
Description: Sets the hysteresis for the changeover speed of the motor model for encoderless operation.
Dependency: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Refer to: p1755
Note: The parameter value refers to p1755.
Extremely small hystereses can have a negative impact on the stability in the changeover speed range, and very
high hystereses in the standstill range.
p1758[0...n] Motor model changeover delay time closed/open-loop control / MotMod t cl_op
Access level: 3
Can be changed: U, T
Unit group: -
Min
100 [ms]
Description: Sets the minimum time for falling below the changeover speed when changing from closed-loop controlled operation
to open-loop controlled operation.
Dependency: The wait time has no significance if the setpoint speed before the ramp-function generator lies in the open-loop
speed controlled operating range. In this case, the change is made without any delay.
Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Refer to: p1755, p1756
Note: If p1758 is changed, commissioning must be selected in order to validate the value for the blocking monitoring.
p1759[0...n] Motor model changeover delay time open/closed-loop control / MotMod t op_cl
Access level: 3
Can be changed: U, T
Unit group: -
Min
0 [ms]
Description: Sets the minimum time for a transition from open-loop controlled to closed-loop controlled operation after the lower
changeover speed p1755 * (1 - p1756 / 100 %) has been exceeded.
Dependency: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Refer to: p1755, p1756
Note: With p1759 = 2000 ms, the delay time becomes ineffective and the model changeover is determined by the output
frequency only (changeover for p1755).
248
Calculated: p0340 = 1,3
Scaling: -
Unit selection: -
Max
95.0 [%]
Calculated: -
Scaling: -
Unit selection: -
Max
10000 [ms]
Calculated: p0340 = 1,3,5
Scaling: -
Unit selection: -
Max
2000 [ms]
SINAMICS G120 Control Units CU240B-2/CU240E-2
Data type: FloatingPoint32
Dyn. index: -
Func. diagram: 6730, 6731
Factory setting
50.0 [%]
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: -
Factory setting
500 [ms]
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: -
Factory setting
0 [ms]
List Manual (LH11), 01/2016, A5E33839529