Siemens SINAMICS G120 List Manual page 222

2 Parameters
2.2 List of parameters
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. A change is made into normal operation if the OFF1 command is withdrawn prematurely (the system waits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.
Note:
DCBRK: DC Braking
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: 2
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
222
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]
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, p0130
Func. diagram: 7017
Factory setting
210000.00 [rpm]
SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890