Siemens SINAMICS G120 List Manual page 220

2 Parameters
2.2 List of parameters
Recommendation: This time should be set longer than the actual closing time of the brake. This ensures that the pulses are only
suppressed after the brake has closed.
Dependency: Refer to: p1215, p1216
Notice: If the selected closing time is too short with respect to the actual closing time of the brake, then the load can sag.
If the closing time is selected to be too long with respect to the actual closing time of the brake, the control works
against the brake and therefore reduces its lifetime.
Note: For a motor with DRIVE-CLiQ and integrated brake, for p0300 = 10000, this time is pre-assigned the value saved in
the motor.
p1226[0...n] Threshold for zero speed detection / n_standst n_thresh
Access level: 2
Can be changed: U, T
Unit group: 3_1
Min
0.00 [rpm]
Description: Sets the speed threshold for the standstill identification.
Acts on the actual value and setpoint monitoring.
When braking with OFF1 or OFF3, when the threshold is undershot, standstill is identified.
Dependency: Refer to: p1227
Caution: For closed-loop speed and torque control without encoder, the following applies:
If p1226 is set to values under approx. 1 % of the rated motor speed, then the model switchover limits of the vector
control must be increased in order to guarantee reliable shutdown (see p1755, p1750.7).
Note: Standstill is identified in the following cases:
- the speed actual value falls below the speed threshold in p1226 and the time started after this in p1228 has expired.
- the speed setpoint falls below the speed threshold in p1226 and the time started after this in p1227 has expired.
The actual value sensing is subject to measuring noise. For this reason, standstill cannot be detected if the speed
threshold is too low.
p1227 Zero speed detection monitoring time / n_standst t_monit
Access level: 3
Can be changed: U, T
Unit group: -
Min
0.000 [s]
Description: Sets the monitoring time for the standstill identification.
When braking with OFF1 or OFF3, standstill is identified after this time has expired, after the setpoint speed has
fallen below p1226 (also refer to p1145).
Dependency: The parameter is pre-assigned depending on the size of the power unit.
Refer to: p1226
Notice: For p1145 > 0.0 (RFG tracking) the setpoint is not equal to zero dependent on the selected value. This can therefore
cause the monitoring time in p1227 to be exceeded. In this case, for a driven motor, the pulses are not suppressed.
Note: Standstill is identified in the following cases:
- the speed actual value falls below the speed threshold in p1226 and the time started after this in p1228 has expired.
- the speed setpoint falls below the speed threshold in p1226 and the time started after this in p1227 has expired.
For p1227 = 300.000 s the following applies:
Monitoring is deactivated.
For p1227 = 0.000 s, the following applies:
With OFF1 or OFF3 and a ramp-down time = 0, the pulses are immediately suppressed and the motor "coasts" down.
Once the Control Unit has been booted up for the first time or if the factory settings have been defined accordingly,
the parameter is defined in accordance with the power unit.
220
Calculated: -
Scaling: -
Unit selection: p0505
Max
210000.00 [rpm]
Calculated: -
Scaling: -
Unit selection: -
Max
300.000 [s]
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: 2701, 8022
Factory setting
20.00 [rpm]
Data type: FloatingPoint32
Dyn. index: -
Func. diagram: 2701
Factory setting
300.000 [s]
SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890