Siemens MICROMASTER 440 - Manual (Page 59)

Issue 10/06 6 Commissioning
MICROMASTER 440
Operating Instructions (Compact)
59
t
P1234
OFF1/OFF3
ON
t
t
⏐f⏐
OFF ramp
P1233
2
t
OFF2
tt
P0347
OFF2
OFF2
DC braking
0
1
DC braking active
r0053
Bit00
P1234 =... DC braking start frequency (entered in Hz)
Sets the start frequency for the DC brake.
6.4.18.5 Compound braking
P1236 =... Compound braking current (entered in %)
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).
(see also 6.4.12").
Compound braking switch-on level P0210 2 13 . 1 V 2 1.13 U mains
DC_Comp
⋅ ⋅ = ⋅ ⋅ =
If P1254 = 0 :
1242 r 0.98 U
DC_Comp
⋅ = Compound braking switch-on level
otherwise :
⏐f⏐
i
t
t
f_act
f_set
P1236 = 0
Without Compound braking
u
t
⏐f⏐
i
t
t
f_act
f_set
P1236 > 0
With Compound braking
t
DC-link
u
DC-link
U
DC_Comp
650 Hz
0 %