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SINAMICS G120C
List Manual (LH13), 04/2014, A5E33840768B AA
135
2 Parameters
2.2 List of parameters
5: DC braking for OFF1/OFF3
14: DC braking below starting speed
Dependency: Refer to: p0300, p1232, p1233, p1234, r1239
Note: The function can only be used for induction motors (p0300 = 1).
Re 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- the function can be superseded by an OFF2 response.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DC braking can only be withdrawn (p1231 = 0) if it is not being used as a fault response in p2101.
Re 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 A change is made into normal operation if the OFF1 command is withdrawn prematurely. 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. 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
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.
Description: Sets the DC braking time (as fault response).
Dependency: Refer to: p1230, p1231, p1232, p1234, r1239
p1232[0...n] DC braking braking current / DCBRK I_brake
Access level: 2 Calculated: p0340 = 1 Data type: FloatingPoint32
Can be changed: U, T Scaling: - Dyn. index: MDS, p0130
Units group: - Unit selection: - Func. diagram: 7017
Min Max Factory setting
0.00 [Arms] 10000.00 [Arms] 0.00 [Arms]
p1233[0...n] DC braking time / DCBRK time
Access level: 2 Calculated: - Data type: FloatingPoint32
Can be changed: U, T Scaling: - Dyn. index: MDS, p0130
Units group: - Unit selection: - Func. diagram: 7017
Min Max Factory setting
0.0 [s] 3600.0 [s] 1.0 [s]
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