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2 Parameters
2.2 List of parameters
SINAMICS G120C
234 List Manual (LH13), 04/2014, A5E33840768B AA
Value: 0: No wire control
1: Two wire control clockwise/counterclockwise 1
2: Two wire control clockwise/counterclockwise 2
3: Three wire control enable clockwise/counterclockwise
4: Three wire control enable ON/reversing
Dependency: Refer to: p0015, p3330, p3331, p3332, r3333
Note: This value depends on the wire control set in p0015.
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: Display and connector output for the status word of the compound braking and DC quantity control.
Dependency: Refer to: p3856
Description: Exits quick commissioning (p0010 = 1) with automatic calculation of all parameters of all existing drive data sets that
depend on the entries made during quick commissioning.
p3856[0...n] Compound braking current / Compound I_brake
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 [%]
r3859.0 CO/BO: Compound braking/DC quantity control status word / Comp-br/DC_ctr ZSW
Access level: 3 Calculated: - Data type: Unsigned32
Can be changed: - Scaling: - Dyn. index: -
Units group: - Unit selection: - Func. diagram: 6797
Min Max Factory setting
- - -
Bit field: Bit Signal name 1 signal 0 signal FP
00 Compound braking active Yes No -
p3900 Completion of quick commissioning / Compl quick_comm
Access level: 1 Calculated: - Data type: Integer16
Can be changed: C(1) Scaling: - Dyn. index: -
Units group: - Unit selection: - Func. diagram: -
Min Max Factory setting
0 3 0
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