11-2
Power connection
ECODRIVE DKC02.1 Drive Controller
DOK-ECODRV-DKC02.1****-PRJ2-EN-P
11.2 Line contactor/fuse protector
A selection table (Fig. 11-5) is available to facilitate the selection of a suit-
able line contactor and fuse protector for the power connection.
Calculating the phase current at the power connection
To be able to select a suitable line contactor and a suitable power con-
nection fuse protection, the phase current
I
N
at the power connection must
first be calculated.
The phase current
I
N
at the power coonnection is determined from the
power supplied by the power line
S
AN
.
Locate the power connection output in the selection lists of the drive com-
ponents, or calculate it according to formula Fig. 11-3. For several drive
controllers, add the individual power connection output values.
P
M
n
DC
EFF
MITTEL
2
60
=
⋅
⋅
⋅
π
k
P
DC
:
DC bus power in W
M
EFF
:
effective torque in Nm
n
MITTEL
:
average speed in min-1
k:
factor for motor and controller efficiency = 1.25
Fig. 11-2: Calculating the DC bus power
S
P
F
AN
DC
=
⋅
F:
factor for the connected load
F:
2.6 for
P
DC
= 500 W
F:
1.95 for
P
DC
= 2000 W
Fig. 11-3: Calculating the power connection ou tput
Three-phase connection:
I
S
U
N
AN
N
=
⋅
3
I
N
:
phase current on the line side in A
S
AN
:
power connection output in VA
U
N
:
voltage between the phases of the power line in V
Fig. 11-4: Calculating the phase current at the power line
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