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Parameters
7.2 Parameter list
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 braking function.
Compound braking is a superimposition of the DC braking 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%.
p3857[0...n]
DC quantity controller P gain / DC_ctrl Kp
Access level: 3
Can be changed: T, U
Unit group: -
Min:
0.000
Description:
Sets the proportional gain of the DC quantity controller for the overmodulation range.
p3858[0...n]
DC quantity controller integral time / DC_ctrl Tn
Access level: 3
Can be changed: T, U
Unit group: -
Min:
0.00 [ms]
Description:
Sets the integral time for the DC quantity controller.
r3859.0...1
CO/BO: Compound braking/DC quantity control status word / Comp-br/DC_ctr ZSW
Access level: 3
Can be changed: -
Unit group: -
Min:
-
Description:
Display and connector output for the status word of the compound braking and DC quantity control.
Bit field:
Bit
00
01
842
Signal name
Compound braking active
DC quantity control active in the overmodulation range
Calculated: CALC_MOD_CON Data type: FloatingPoint32
Scaling: -
Unit selection: -
Max:
100000.000
Calculated: CALC_MOD_CON Data type: FloatingPoint32
Scaling: -
Unit selection: -
Max:
1000.00 [ms]
Calculated: -
Scaling: -
Unit selection: -
Max:
-
1 signal
Yes
Yes
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
Dynamic index: DDS, p0180
Function diagram: 6797
Factory setting:
0.000
Dynamic index: DDS, p0180
Function diagram: 6797
Factory setting:
2.00 [ms]
Data type: Unsigned32
Dynamic index: -
Function diagram: 6797
Factory setting:
-
0 signal
FP
No
-
No
-
SINAMICS G120X converter
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