Siemens SINAMICS G120D CU240D-2 DP Manual page 193

p1232[0...n] DC braking braking current / DCBRK I_brake
Access level: 2
Can be changed: U, T
Unit group: -
Min
0.00 [Arms]
Description: Sets the braking current for DC braking.
Dependency: Refer to: p1230, p1231, p1233, p1234, r1239, p1345, p1346
Note: A change to the braking current becomes effective the next time that DC braking is switched on.
The value for p1232 is specified as an rms value in the 3-phase system. The magnitude of the braking current is the
same as that of an identical output current at frequency zero (see r0067, r0068, p0640). The braking current is
internally limited to r0067.
For the current controller, the settings of parameters p1345 and p1346 (I_max limiting controller) are used.
p1233[0...n] DC braking time / DCBRK time
Access level: 2
Can be changed: U, T
Unit group: -
Min
0.0 [s]
Description: Sets the DC braking time (as fault response).
Dependency: Refer to: p1230, p1231, p1232, p1234, r1239
Note: If a speed encoder is being used, DC braking is ended as soon as the drive falls below the standstill threshold
(p1226).
p1234[0...n] Speed at the start of DC braking / DCBRK n_start
Access level: 1
Can be changed: U, T
Unit group: -
Min
0.00 [rpm]
Description: Sets the starting speed for DC braking.
If the actual speed falls below this threshold, then DC braking is activated.
Dependency: Refer to: p1230, p1231, p1232, p1233, r1239
Notice: If an encoder fault occurs during closed-loop operation with an encoder, controlled deceleration of the drive down to
the start speed p1234 is no longer possible. In this case, DC braking is activated immediately and injects the braking
current p1232 for the braking time p1233 after de-magnetizing. The braking current and braking duration must,
therefore, be dimensioned accordingly for this situation so that the drive can be decelerated to standstill.
In the case of operation with an encoder, this speed may not be set too low so as ensure that the oscillation
movement induced by the residual flux/remanence of the motor does not cause DC braking to be de-activated again.
Note: Function p1231 = 14 is activated at 15 1/min higher than the value set in p1234. This hysteresis is required to prevent
DC braking from being de-activated for speed encoder signals with ripple.
r1239.8...13 CO/BO: DC braking status word / DCBRK ZSW
Access level: 2
Can be changed: -
Unit group: -
Min
-
Description: Status word of the DC braking.
Bit field: Bit
08
10
11
SINAMICS G120D
List Manual (LH14), 01/2016, A5E33842313
Signal name
DC braking active
DC braking ready
DC braking selected
Calculated: p0340 = 1
Scaling: -
Unit selection: -
Max
10000.00 [Arms]
Calculated: -
Scaling: -
Unit selection: -
Max
3600.0 [s]
Calculated: -
Scaling: -
Unit selection: -
Max
210000.00 [rpm]
Calculated: -
Scaling: -
Unit selection: -
Max
-
1 signal
Yes
Yes
Yes
2 Parameters
2.2 List of parameters
Data type: FloatingPoint32
Dyn. index: MDS, p0130
Func. diagram: 7017
Factory setting
0.00 [Arms]
Data type: FloatingPoint32
Dyn. index: MDS, p0130
Func. diagram: 7017
Factory setting
1.0 [s]
Data type: FloatingPoint32
Dyn. index: MDS
Func. diagram: 7017
Factory setting
210000.00 [rpm]
Data type: Unsigned32
Dyn. index: -
Func. diagram: -
Factory setting
-
0 signal
No
No
No
FP
7017
7017
-
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