Commissioning via the built-in BOP
5.6 Function commissioning
SINAMICS V20 Converter
96 Operating Instructions, 10/2019, A5E34559884-012
Setting parameters
P1230[0...2] BI: Enable DC braking This parameter enables DC braking via a signal applied from an external
source. The function remains active while external input signal is active.
P1232[0...2] DC braking current [%] This parameter defines level of DC current relative to rated motor current
(P0305).
Range: 0 to 250 (factory default: 100)
P1233[0...2] Duration of DC braking [s] This parameter defines duration for which DC braking is active following
an OFF1 or OFF3 command.
Range: 0.00 to 250.00 (factory default: 0.00)
P1234[0...2] DC braking start frequency [Hz] This parameter sets the start frequency for DC braking.
Range: 0.00 to 550.00 (factory default: 550.00)
P0347[0...2] Demagnetization time [s] This parameter changes time allowed after OFF2/fault condition, before
pulses can be re-enabled.
Range: 0.000 to 20.000 (factory default: 1.000)
For DC current braking, the motor kinetic energy is converted into thermal energy in the
motor. If braking lasts too long, then the motor can overheat.
Note
The "DC braking" function is only practical for induction motors.
DC braking is not suitable to hol
d suspended loads.
While DC braking, there is no other way of influencing the converter speed using an external
control. When parameterizing and setting
the converter, it should be tested using real loads
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