s
n
o
it
c
e
n
n
o
C
s
n
i
a
M
s
r
e
ll
o
r
t
n
o
C
e
v
i
r
D
3
0
E
V
I
R
D
O
C
E
11-7
11.5 Mains Contactor / Fuses
To select suitable mains contactor and fuses for the power connection, a
selection table is available. Note the inrush current of the selected
contactor.
Computing phase current on the mains
To select a suitable mains contactor and fuses for the power connections
it is necessary to first compute the phase current
I
N
at the mains.
The mains-side phase current
I
N
is determined out of the mains
connecting power
S
AN
.
Select the mains connecting power in the list or compute it according to
the following formula. With multiple controllers, add the individual powers.
k
60
2
MITTEL
EFF
ZWD
π
n
M
P
=
P
ZWD
:
required DC bus continuous power in W
M
EFF
:
rms torque in Nm
n
MITTEL
:
mean speed in min-1
k:
factor for motor and controller efficiency = 1.25 (MKD, MHD)
Fig. 11-4:
Computing DC bus power
F
P
S
ZWD
N1
=
S
N
1
:
connected load in VA
P
ZWD
:
DC bus continuous power in W
F:
connected load factor
F=2.8 for single-phase feed
F for three-phase feed see page 11-9:
"Factor F for Computing the Connected Load"
Fig. 11-5:
Computing mains connected load
Single-phase load:
N1
N1
N1
U
S
=
I
Three-phase load:
3
U
S
=
I
N1
N1
N1
I
N1
:
mains-side phase current in A
S
N1
:
connected load in VA
U
N1
:
voltage between phases of the mains in V
Fig. 11-6:
Computing mains-side phase current
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(479) 422-0390
Summary of Contents for BZM 01.3-01-07
Page 343: ......
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