Selecting Q1 Fuse And K1 Contactor - REXROTH EcoDrive Cs Project Planning Manual

6-14
Mains and Supply Voltage Connection
6.4

Selecting Q1 Fuse and K1 Contactor

Connection U [V]
Netz_max
single-phase 264
264
264
264
three-phase 264
264
264
264
• Several controllers can be operated on a single fuse and mains
Notes
contactor. The phase currents and inrush currents of the individual
drives must then simply be added up.
• If a transformer is used, then the fuses and contactors must be
installed on the primary side.
• When selecting the mains contactor (power circuit-breaker), observe
the fuse characteristics to make sure that the relatively strong inrush
current does not cause the fuse to respond.
With the known technical data of the devices and the above formulas
there are the following values:
η [%]
P [W] P
mech
100 61
200 71
400 83
750 90
100 61
200 71
400 83
750 90
U Maximum admissible mains input voltage
Netz_max:
P : Power at the driven shaft of the motor
mech
η:
Efficiency
P : Continuous DC bus power
DC
S : Mains connection power
N1
I : Inrush current
Ein
I : Phase current of the mains
N1
T: Time constant of RC element (T = R
Fig. 6-18: Overview of phase currents and inrush current peaks of the devices
for single-phase and three-phase operation
Therefore, the following criteria have to be taken into account when
selecting the mains contactor:
• cable cross section of the supply feeders
The supply feeders of the drive controllers have to be fused by means
of the circuit breakers. The maximum possible wire cross section at
the terminal connector is 2.0 mm
2
1.5 mm ).
• mains current consumption at continuous operation in nominal
working point
It must be possible for the mains-side phase current I
continuously flowing without the fuse triggering.
• duration of maximum inrush current and device peak current
It must be possible for the inrush current I
t = 5*T = 15 ms without the fuse triggering. Therefore use slow fuses!
[W] S [VA] I
DC N1 Ein
140.3 400 79.2
253.2 700 79.2
457.1 1400 79.2
796.2 2165 79.2
140.3 400 79.2
253.2 700 79.2
457.1 1400 79.2
796.2 2165 79.2
Softstart
2
(-> max. 16 A when cross-section is
DOK-ECODR3-DKC**.3-CS*-PR02-EN-P
Rexroth EcoDrive Cs Drives
[A] I [A] T [ms]
N1
1.5 2.54
2.7 3.8
5.3 3.8
8.2 3.8
0.9 2.54
1.5 3.8
3.1 3.8
4.7 3.8
x C )
Zwischenkreis
to be
N1
to flow at least for the time
Ein