6-16
Mains and Supply Voltage Connection
Rexroth EcoDrive Cs Drives
DOK-ECODR3-DKC**.3-CS*-PR02-EN-P
6.6
Operation on 400/480 V Mains
Basics
Operation on the mains with voltages above 240 V requires a mains
transformer. This applies both to single-phase operation and to three-
phase operation.
Note:
There are often only the 3 phases (L1, L2, L3) available in the
control cabinet so that the resulting voltage is 400 V (480 V)
even with single-phase mains connection (L1, L2)!
Selecting the Mains Transformer
When selecting the mains transformer, the total mains connection power
S
N1
and the total phase current I
N1
of all drive controllers to be supplied
has to be taken into account (see table below).
Connection
P
mech
[W]
η
[%]
P
DC
[W]
S
N1
[VA]
Form
factor F
I
N1
[A]
I
Ein
[A]
100
61
140.3
400
2.436
1.5
78.6
200
71
253.2
700
2.471
2.7
78.6
400
83
457.1
1400
2.905
5.3
78.6
single-
phase
750
90
796.2
2400
2.848
9.1
78.6
100
61
140.3
400
2.436
0.9
78.6
200
71
253.2
700
2.471
1.6
78.6
400
83
457.1
1400
2.905
3.1
78.6
three-phase
750
90
796.2
2400
2.848
5.3
78.6
P
mech
: Power at the driven shaft of the motor
η
:
Efficiency
P
DC
:
Continuous DC bus power
S
N1
:
Mains connection power
I
Ein
:
Inrush current
I
N1
:
Phase current of the mains
T:
Time constant of RC element (T = R
Softstart
x C
Zwischenkreis
)
Fig. 6-19: Overview of phase currents and inrush current peaks of the devices
for single-phase and three-phase operation
6 drive controllers of the DKC0x.3-W0008 (400 W) type are to be supplied
in a three-phase way via a transformer. The resulting mains connection
power is 6 x 1400 VA = 8400 VA. This means that a transformer of
8.4 kVA has to be used if all axes can load the mains simultaneously. As
often not all axes require power at the same time, a respective
coincidence factor can be taken into account, if necessary.
Note:
Rexroth supplies appropriate transformers (see chapter 10
Additional Components).
Example
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
