11-2
Power connection
ECODRIVE DKC01.1/DKC11.1 Drive Controllers
DOK-ECODRV-DKC01/11.1*-PRJ3-EN-P
11.2 Line contactor/fuse protector
A selection table (see Fig. 11-6) is available to facilitate the selection of a
suitable line contactor and fuse protector device for the power connection.
Calculating the phase current at the power connection
To be able to select a suitable line contactor and suitable power connec-
tion fuse protector, the phase current IN at the power connection must
first be calculated.
The apparent power
S
is used to determine the phase current
I
N
at the
power connection.
Locate the apparent power in the selection table of the drive components,
or calculate it according to formula Fig. 11-4. For several drive controllers,
add the individual apparent power 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. 11-3: 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. 11-4: Calculating the power connection ou tput
Single-phase connection:
I
S
U
N
AN
N
=
Three-phase connection:
I
S
U
N
AN
N
=
⋅
3
I
N
:
Phase current at the power connection in A
S
AN
:
Power connection output in VA
U
N
:
Voltage between the phases of the power supply lines in V
Fig. 11-5: Calculating the phase current at the power connection
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