Siemens SINAMICS V20 Series - Page 71

Commissioning
5.6 Function commissioning
SINAMICS V20 Inverter
Operating Instructions, 07/2012, A5E03728167
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Setting parameters
Parameter Function Setting
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.
Factory default: 0
P1232[0...2] DC braking current [%] This parameter defines level of DC current relative to rated
motor current (P0305).
Range: 0 ... 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 ... 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 ... 599.00 (factory default: 599.00)
P0347[0...2] Demagnetization time [s] This parameter changes time allowed after OFF2 / fault
condition, before pulses can be re-enabled.
Range: 0.000 ... 20.000 (factory default: 1.000)
NOTICE
The "DC braking" function is only practical for induction motors.
DC braking is not suitable to hold suspended loads.
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.
While DC braking, there is no other way of influencing the inverter speed using an external
control. When parameterizing and setting the inverter system, then as far as possible, it
should be tested using real loads.