Siemens SINAMICS G120XA, Operating Instructions Manual, Page: 498 / 918

Description: Setting to activate DC braking.
Value: 0: No function
4: DC braking
5: DC braking for OFF1/OFF3
14: DC braking below starting speed
Dependency: See also: p0300, p1232, p1233, p1234, r1239
Note
DCBRK: DC Braking
For p1231 = 4:
The function is activated as soon as the activation criterion is fulfilled.
- the function can be superseded by an OFF2 response.
Activation criterion (one of the following criteria is fulfilled):
- binector input p1230 = 1 signal (DC braking activation, depending on the operating mode).
- the drive is not in the state "S4: Operation" or in "S5x".
- the internal pulse enable is missing (r0046.19 = 0).
DC braking can only be withdrawn (p1231 = 0) if it is not being used as a fault response in p2101.
In order that DC braking is active as fault response, the corresponding fault number must be entered in p2100 and fault
response p2101 set = 6.
For p1231 = 5:
DC braking is activated if the OFF1 or OFF3 command is present. Binector input p1230 is ineffective. If the drive speed
still lies above the speed threshold p1234, then initially, the drive is ramped-down to this threshold, demagnetized (see
p0347) and is then switched into DC braking for the time set in p1233. After this, the drive is switched-off. If, at OFF1,
the drive speed is below p1234, then it is immediately demagnetized and switched into DC braking. The system
switches back to normal operation if the OFF1 command is withdrawn prematurely (the system waits for
demagnetization). Flying restart must be activated if the motor is still rotating.
DC braking by means of fault response continues to be possible.
For p1231 = 14:
In addition to the function for p1231 = 5, binector input p1230 is evaluated.
DC braking is only automatically activated when the speed threshold p1234 is fallen below if binector input p1230 = 1
signal. This is also the case, if no OFF command is present.
After demagnetization and after the time in p1233 has expired, the drive changes back into normal operation or is
switched-off (for OFF1/OFF3).
If a 0 signal is applied to binector input p1230, for OFF1 and OFF3 no DC braking is executed.
p1232[0...n] DC braking braking current / DCBRK I_brake
CUG120XA_USS (DC
braking)
Access level: 2 Calculated: CALC_MOD_ALL Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: MDS, p0130
Unit group: - Unit selection: - Function diagram: 7017
Min:
0.00 [Arms] Max:
10000.00 [Arms] Factory setting:
0.00 [Arms]
Description: Sets the braking current for DC braking.
Dependency: See also: 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.
Parameters
7.3 Parameters
SINAMICS G120XA converter
496
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB