Compound Braking - Siemens MICROMASTER 440 Operating Instructions Manual

Issue 10/03
3.14.2

Compound braking

Parameter range:
Warnings
Faults
Function chart number:
For compound braking (this is enabled using P1236) DC braking is superimposed
with regenerative braking (where the drive regenerates into the line supply as it
brakes along a ramp). If the DC link voltage exceeds the compound switch-in
threshold V
of P1236. In this case, braking is possible with a controlled (closed-loop) motor
frequency and minimum regenerative feedback. Effective braking is obtained
without having to use additional components by optimizing the ramp-down time
(P1121 for OFF1 or when braking from f
compound braking P1236.
f
Fig. 3-54
The compound braking switch-in threshold V
parameter P1254 (Auto detect V
supply voltage P0210 or indirectly using the DC link voltage and r1242 (refer to the
formula in Fig. 3-54).
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
P1236
-
-
-
(refer to Fig. 3-54), then a DC current is impressed as a function
DC-Comp
P1236 = 0
Without Compound braking
f_set
f_act
i
u
DC-link
Compound braking
to f , P1135 for OFF3) and using
1 2
With Compound braking
f
f_set
t
i
t
u
DC-link
U
DC-Comp
t
P1254 = : 0 U
DC - Comp
≠
P1254 : 0 U
DC - Comp
is calculated as a function of
DC-Comp
switch-on levels) either directly using the line
DC
3 Functions
P1236 >0
f_act
t
t
t
= ⋅ ⋅
. 1 13 2 P0210
= ⋅
0.98 r 1242
139