Siemens SINAMICS G120D CU240D-2 DP Manual page 191

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 de-activated.
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.
p1228 Pulse suppression delay time / Pulse suppr t_del
Access level: 3
Can be changed: U, T
Unit group: -
Min
0.000 [s]
Description: Sets the delay time for pulse suppression.
After OFF1 or OFF3, the pulses are canceled, if at least one of the following conditions is fulfilled:
- the speed actual value falls below the threshold in p1226 and the time started after this in p1228 has expired.
- the speed setpoint falls below the threshold in p1226 and the time started after this in p1227 has expired.
Dependency: Refer to: p1226, p1227
SINAMICS G120D
List Manual (LH14), 01/2016, A5E33842313
Calculated: -
Scaling: -
Unit selection: p0505
Max
210000.00 [rpm]
Calculated: -
Scaling: -
Unit selection: -
Max
300.000 [s]
Calculated: -
Scaling: -
Unit selection: -
Max
299.000 [s]
2 Parameters
2.2 List of parameters
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]
Data type: FloatingPoint32
Dyn. index: -
Func. diagram: 2701, 8022
Factory setting
0.010 [s]
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