Table of Contents
11-2
Power connection
11.2 Line contactor/fuse protector
Calculating the phase current at the power connection
LSA Control S.L. www.lsa-control.com [email protected] (+34) 960 62 43 01
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.
To be able to select a suitable line contactor and a suitable power con-
nection fuse protection, the phase current I
first be calculated.
The phase current I
at the power coonnection is determined from the
N
power supplied by the power line S
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
DC
P
:
DC bus power in W
DC
M
:
effective torque in Nm
EFF
n
:
average speed in min-1
MITTEL
k :
factor for motor and controller efficiency = 1.25
Fig. 11-2: Calculating the DC bus power
F :
factor for the connected load
F :
2.6 for P
= 500 W
DC
F :
1.95 for P
= 2000 W
DC
Fig. 11-3: Calculating the power connection ou tput
Three-phase connection:
I
:
phase current on the line side in A
N
S
:
power connection output in VA
AN
U
:
voltage between the phases of the power line in V
N
Fig. 11-4: Calculating the phase current at the power line
ECODRIVE DKC02.1 Drive Controller
at the power connection must
N
.
AN
π
⋅
⋅
M
n
2
⋅
EFF
MITTEL
=
k
60
⋅
S
=
P
F
AN
DC
S
AN
I
=
N
⋅ 3
U
N
DOK-ECODRV-DKC02.1****-PRJ2-EN-P
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