Siemens SINAMICS S120 Function Manual page 196

Basic functions
6.8 Armature short-circuit brake, internal voltage protection, DC brake
● In V/f mode:
DC braking as fault response
If the DC brake is activated as a fault response, the motor is initially braked in field-oriented
mode along the braking ramp up to the threshold set in p1234. The slope of the ramp is
identical with that of the OFF1 ramp (parameterized using p1082, p1121). Subsequently, the
pulses are disabled for the motor demagnetizing time p0347 in order to demagnetize the
motor. The DC braking will start for the duration set in p1233.
If an encoder is used, braking will continue until the speed falls below the standstill threshold
p1226.
If no encoder is used, only the period in p1233 will be applied.
0... 3
p1231[M] (0)
p1230[C]
4
(0)
0
<2>
0...20 [s]
p0347[M] (0)
Figure 6-5 DC brake
196
the drive then returns to controlled mode. If the "flying restart" function is not active, the
drive can only be restarted from standstill without overcurrent fault.
With the "flying restart" function activated, the converter frequency is synchronized with
the motor frequency, and the drive will then return to V/f mode. If
the "flying restart" function is not available, the drive can only be restarted from standstill
without overcurrent fault.
<1>
0...10000 [A] 0...3600 [s] 20...210000 [1/min]
p1232[M] (0) p1233[M] (0)
p0347
p1232
p1234
p0347
<3>
p1232
p1233
p1234[M] (0)
[5730]
[6714]
t
r1239.10
[8014]
t
<4>
t r1239.8
t
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
r0068[0]
0.000...100000.000 0.000...50.000 [s]
p1345[D] (0.000) p1346D] (0.030)
<6> <6>
Kp Tn
–
0.000...100000.000 [V/A] 0.00...1000.00 [ms]
p1715[D] (0.000) p1717[D] (2.00)
<5> <5>
p0115
r0072
[5730][6730]
[6300]
Drive Functions