Issue 10/06

6 Commissioning

P1234 =...

2

 

ON

 

 

 

OFF1/OFF3

 

 

t

 

 

 

P0347

 

OFF2

 

 

 

 

 

 

 

t

 

f

 

 

 

P1234

OFF ramp

OFF2

 

 

 

 

DC braking

 

 

 

 

 

 

 

 

OFF2

 

DC braking active

 

 

t

 

 

 

r0053

1

 

 

 

Bit00

0

 

P1233

t

 

 

 

 

DC braking start frequency (entered in Hz)

650 Hz

Sets the start frequency for the DC brake.

 

6.4.18.5Compound braking

P1236 =...

Compound braking current (entered in %)

0 %

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").

If P1254 = 0 :

 

Compound braking switch-on level

UDC_Comp = 1.13 2 Vmains = 1.13 2 P0210

otherwise :

 

Compound braking switch-on level

UDC_Comp = 0.98 r1242

 

P1236 = 0

 

P1236 > 0

 

Without Compound braking

 

With Compound braking

f

f_set

f

f_set

 

 

 

f_act

 

f_act

 

t

 

t

i

 

i

 

 

t

 

t

uDC-link

uDC-link

 

UDC_Comp

t

t

MICROMASTER 440

59

Operating Instructions (Compact)

Page 59
Image 59
Siemens 440 operating instructions DC braking start frequency entered in Hz, Compound braking current entered in %