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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSB 9000 3U Series
2.3.4.2
US models
US models are delivered with a 4 pole mains plug for higher currents. It always requires a 208 V three-phase sup-
ply. For the wiring
cross section,
the rated power of the device and the cable length are decisive. The table below
shows the maximum output current for each phase, based on the connection of a
standalone unit
:
L1
L2
L3
Nominal power
ø
I
max
ø
I
max
ø
I
max
7.5 kW
AWG 8
44 A
AWG 8
44 A
AWG 8
44 A
The PE conductor is imperative and must always be wired!
The included connection plug can receive lose or soldered cable ends of up to 16 mm² (AWG 6). The longer the
connection cable, the higher the voltage loss due to the cable resistance.
Connection scheme:
Figure 8 - Standard 208 V color code wiring
2.3.4.3
Strain relief and plug fixture
There is a standard fixture mounted to the AC input con
-
nection block on the rear. It is used to prevent the AC
plug from loosening and disconnecting due to vibrations
or similar. The fixture is also used as strain relief.
Using the 4x M3 acorn nuts, it is recommend to mount the
fixture to the AC filter block every time the AC plug has
been plugged again.
It is furthermore recommended to install the strain relief
by using suitable cable straps (1 or 2 pcs, not included),
as depicted in the figure to the right.
2.3.4.4
Connection variants
Depending on the max. power rating of a specific model, it requires two or three phases of a three-phase AC
supply. In case
multiple units with 5kW or 10 kW power rating
are connected to the same main terminal it is
recommended to take care for balanced current distribution on the three phases. The table in
shows the
phase currents.
The
15 kW
models are an exception, because they already consume balanced current on all three phases. As
long as only such models are installed, no unbalanced AC load is expected. Systems of 15 kW models mixed with
10 kW models are not automatically balanced, but it can be achieved with a certain number of units which can be
calculated.
