Commissioning via the built-in BOP
5.6 Function commissioning
SINAMICS V20 Converter
Operating Instructions, 10/2019, A5E34559884-012
97
Compound braking
For compound braking (enabled using P1236), DC braking is superimposed with
regenerative braking (where the converter regenerates into the DC-link supply as it brakes
along a ramp). Effective braking is obtained without having to use additional components by
optimizing the ramp-down time (P1121 for OFF1 or when braking from f1 to f2, P1135 for
OFF3) and using compound braking P1236.
Setting parameters
P1236[0...2]
Compound
braking current
[%]
This parameter defines DC level superimposed on AC waveform after exceeding DC-link
voltage threshold of compound braking. The value is entered in [%] relative to rated motor
current (P0305).
Range: 0 to 250 (factory default: 0)
P1254 Auto detect Vdc
switch-on levels
This parameter enables/disables auto-detection of switch-on levels for Vdc_max controller.
= 0: Disabled
= 1: Enabled (factory default)
It is recommended to set P1254 = 1 (auto detection of Vdc switch-on levels enabled). Note
that auto detection only works when the converter has been in standby for over 20s.
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