Siemens SINAMICS G120 Operations Instructions Page 194

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Functions
7.9 Application-specific functions
Inverter with CU240B-2 and CU240E-2 Control Units
192 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
DC braking parameters
Table 7- 34 Parameters for configuring DC braking
Parameter Description
p1230 Activate DC braking (BICO parameter)
The value for this parameter (0 or 1) can be either entered directly or specified by
means of an interconnection with a control command.
p1231 Configure DC braking
p1231 = 0, no DC braking
p1231 = 4, general enabling of DC braking
p1231 = 5, DC braking for OFF1/3, independent of p1230
P1231 = 14, enables DC braking for the case that the motor speed falls below the
start speed for DC braking.
Table 7- 35 Parameters for configuring DC braking in the event of faults
Parameter Description
p2100 Set fault number for fault reaction (factory setting: 0)
Enter the fault number for which DC braking should be activated, e.g.: p2100[3] = 7860
(external fault 1).
p2101 = 6 Fault reaction setting (factory setting: 0)
Assigning the fault response: p2101[3] = 6.
The fault is assigned an index of p2100. The associated fault response must be assigned the same
index in p2101.
In the List Manual of the inverter - in the "Faults and alarms" list - possible fault responses are listed
for every fault. The entry "DCBRAKE" means that for this particular fault, DC braking can be set as
fault response.
Table 7- 36 Additional parameters for setting DC braking
Parameter Description
p1232 DC braking braking current (factory setting: 0 A)
Setting the braking current for the DC braking.
p1233 DC braking duration (factory setting: 1 s)
p1234 DC braking start speed (factory setting: 210000 rpm)
DC braking starts – assuming that it has been correspondingly parameterized
(p1230/p1231) – as soon as the actual speed falls below this threshold.
p0347 Motor de-excitation
The parameter is calculated via p0340 = 1, 3.
The inverter can trip due to an overcurrent during DC braking if the de-excitation time is
too short.
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