User Manual

2 Parameters
2.2 List of parameters
SINAMICS G120 CU230P-2 Control Units
318 List Manual (LH9), 04/2014, A5E33838102B AA
Dependency: The modulator mode p1802 must enable operation in the overmodulation range. In addition, the overmodulation limit
p1803 must be greater than 103 %.
Set the modulator mode p1802 = 10, if the DC quantity control is deactivated and overmodulation is to be prevented.
Notice: Motor identification must be carried out before activating the DC quantity control in the overmodulation range.
Description: Compound braking current is used to define the amount of DC current that is produced on stopping the motor during
U/f operation to further increase the DC brake function.
Compound braking is a superimposition of the DC brake function with regenerative braking (net braking along the
ramp) after OFF1 or OFF3. This permits braking with controlled motor frequency and minimum power input into the
motor.
Effective braking without using additional hardware components is obtained by optimizing the ramp down time and
compound braking.
Dependency: The compound braking current is only activated if the DC link voltage exceeds the threshold value in r1282.
Compound braking does not operate in the following cases:
- DC braking activated (p1230, r1239).
- motor is still not magnetized (e.g. for flying restart).
- vector control parameterized (p1300 >= 20).
- synchronous motor used (p0300 = 2xx).
Notice: Generally, increasing the braking current improves the braking effect when stopping the motor. However, if the value
is set too high, then the drive can be tripped (shut down) as a result of overcurrent or ground fault.
Recommendation: p3856 < 100 % x (r0209 - r0331) / p0305 / 2
Compound braking generates a current in the motor with a ripple manifesting the rotational frequency. The higher the
braking current is set, the higher the resulting ripple, especially when the Vdc_max control is simultaneously active
(refer to p1280).
Note: The parameter value is entered relative to the rated motor current (p0305).
Compound braking is deactivated with p3856 = 0%.
Description: Sets the proportional gain of the DC quantity controller for the overmodulation range.
Description: Sets the integral time for the DC quantity controller.
p3856[0...n] Compound braking current / Compound I_brake
PM240 Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: U, T Scaling: PERCENT Dyn. index: DDS, p0180
Units group: - Unit selection: - Func. diagram: -
Min Max Factory setting
0.00 [%] 250.00 [%] 0.00 [%]
p3857[0...n] DC quantity controller P gain / DC_ctrl Kp
PM230
PM240
Access level: 3 Calculated: p0340 = 1,3,4 Data type: FloatingPoint32
Can be changed: U, T Scaling: - Dyn. index: DDS, p0180
Units group: - Unit selection: - Func. diagram: 6797
Min Max Factory setting
0.000 100000.000 0.000
p3858[0...n] DC quantity controller integral time / DC_ctrl Tn
PM230
PM240
Access level: 3 Calculated: p0340 = 1,3,4 Data type: FloatingPoint32
Can be changed: U, T Scaling: - Dyn. index: DDS, p0180
Units group: - Unit selection: - Func. diagram: 6797
Min Max Factory setting
0.00 [ms] 1000.00 [ms] 2.00 [ms]