Siemens SINAMICS G120 Manual page 165

p1231[0...n] DC braking configuration / DCBRK config
Access level: 2
Can be changed: U, T
Units group: -
Min
0
Description: Setting to activate DC braking.
Value: 0:
4:
5:
14:
Dependency: Refer to: p0300, p1232, p1233, p1234, r1239
Note: The function is activated as soon as the activation criterion is fulfilled.
- the function can be initiated by an OFF2 response.
Activation criterion (one of the following criteria is fulfilled):
- binector input p1230 = 1 signal (DC braking activation).
- the drive is not in the state "S4: Operation" or in "S5x" (refer to function chart 2610).
- the internal pulse enable is missing (r0046.19 = 0).
The function can only be used for induction motors (p0300 = 1).
DC braking can only be withdrawn (p1231 = 0) if it is not being used as a fault response in p2101.
Re p1231 = 5:
DC braking can only be set for induction motors.
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, demag-
netized (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A change is made into normal operation if the OFF1 command is withdrawn prematurely. Flying restart must be
activated if the motor is still rotating.
DC braking by means of fault response continues to be possible.
Re 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.
Notice:
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
© Siemens AG 2011 All Rights Reserved
SINAMICS G120 Control Units CU230P-2 Parameter Manual (LH9), 01/2011
No function
DC braking
DC braking for OFF1/OFF3
DC braking below starting speed
Calculated: -
Scaling: -
Unit selection: -
Max
14
Parameters
List of Parameters
Data type: Integer16
Data set: MDS
Factory setting
0
1-165