Dc Braking - Siemens SINAMICS G130 Operating Instructions Manual

Functions, monitoring, and protective functions
9.2 Drive functions
Parameters
• p0300:
• p1230
• p1231
• r1239
9.2.9.4

DC braking

Description
DC braking is only available for induction motors. It is used preferably when braking in a
hazardous situation, if controlled braking via the drive is no longer possible (for example, in
the event of a power failure, an EMERGENCY OFF, etc.) or if no regenerative infeed is
used.
DC braking is activated via p1231 = 4 or via p1231 = 14. It can be initiated via an input signal
p1230 (signal = 1) or a fault response.
Activation of DC braking via input signal
p1231 = 4 (internal armature short-circuit/DC braking)
If DC braking is activated by the digital input signal, the first step is that the pulses are
blocked for the duration of the demagnetization time (p0347) of the motor in order to
demagnetize the motor - the parameter p1234 (speed at the start of DC braking) is ignored.
Then the braking current (p1232) is applied as long as the input is initiated in order to brake
the motor or hold it at standstill.
p1231 = 14 (DC braking below the starting speed)
DC braking is initiated, if during operation a 1-signal is pending at the binector input p1230
and the actual speed is below the starting speed (p1234).
After the preceding demagnetization (p0347) of the motor for the period set in p1233, the
braking current p1232 is applied and subsequently switched off automatically.
408
Mot type selection
BI: Armature short-circuit/DC braking activation
Armature short-circuit/DC braking configuration
• 4: Internal armature short-circuit/DC braking
CO/BO: Armature short-circuit/DC braking status word
Inverter chassis units
Operating Instructions, 07/2016, A5E00331449A