Siemens SINAMICS DCM Manual página 826

Field rev sig s
p50580[C]
(0)
Field rev br sig s
p50581[C]
(0)
Control logic
for
field reversal
If < If_min
[8025.6] r53026.0
If_act < If_set x
p50092[0] (3.0 s): Wait time for field decrease before opening the current field contactor
[8025.6] r53026.1
p50092[1] (0.2 s): Wait time before activation of new field contactor
p50092[2] (0.1 s): Wait time before enabling of field firing pulses
p50092[3] (3.0 s): Wait time after field rebuilding before enabling of armature firing pulses
FldRev n_act sig s
p50583[C]
[6810.5] (r52167)
1 2
DO: DC_CTRL
Field circuit control - Field reversal
1 = Switch on field contactor 1
(positive field direction)
CUD DO 0 sig s
Field dir pos
p50771
r53195.0
1 = Switch on field contactor 2
(negative field direction)
CUD DO 1 sig s
Field dir neg
p50772
r53195.1
n_act invert
r53195.2 [6810.1]
Field rev t_wait
0.0...10.0 [s]
p50092[0...3]
<1>
a) with protective resistor:
Rs
3 4
CUD DO 0 t_del CUD DO Inv CUD
0...10000 [ms] 0...1
X177
p50775 (0) p50770[0] (0)
Forward
19
direction
Digital output 0
(0)
[2055]
CUD DO 1 t_del CUD DO Inv
0...10000 [ms] 0...1
p50776 (0) p50770[1] (0)
Backward
20
direction
Digital output 1
(0)
[2055]
23
M
Suppressor circuit
b) with varistor
1000 V
Rs V1
Rs =
I-field-rated
5
fp_6920_13_eng.vsd
01.10.18 V01.05.00
k21 1C1 1D1 3C
K20
k20
M
K20
K21
Rs V1
A suppressor circuit with varistor can be used, if
the following applies:
(I-field-rated)² · L
< 400 Ws
2
Rs ” 1.5 kŸ
V1 = B32k420 (SIOV, block varistor)
6 7
Function diagram
SINAMICS DCM
8000 μs
3D
K21
<1>
8
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