© EA Elektro-Automatik in 2022, this information is subject to change without notice
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06230820_manual_psi_10000_3u_15kw_en_01
2.3.4.5
Grounding the enclosure
The devices feature a separate grounding point on the rear side, as depicted on the figure
to the right and marked as item “7” in
For reasons of safety for people working with the device which, amongst other measures, is
achieved by keeping the leakage current as low as possible, the enclosure must be grounded.
It requires a separate protective earth line (PE), being connected to the grounding point.
The cross section of that line must be at least the same as with the ground conductor in
the AC supply cable.
Figure 12 - Grounding point
2.3.4.6
Connection variants
Depending on the rated power of a specific model, it requires two or three phases of a three-phase AC supply. In case
multiple
units with 5 kW or 10 kW power rating
are connected to the same main terminal it’s recommended to take care for balanced
current distribution on the three phases. The table in
2.3.4.2 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 with mixed models are not automatically balanced,
but balance can be achieved with a certain number of units by adding up the phase current of every used phase.
Suggestions for phase assignment:
Single unit 5 kW (2.5 kW US208V)
Multiple units 5 kW (2.5 kW US208V), balanced
Unit
L1(A)
L2(B)
L2
L3
Unit 1
5 kW
Unit 2
5 kW
Unit 3
5 kW
L1
(A)
L2
(B)
L3
(C)
L2
L3
L2
L3
L2
L3
or
Unit
L2(B)
L3(C)
L2
L3
or
Unit
L1(A)
L3(C)
L2
L3
Multiple units 10 kW, balanced
Unit 1
10kW
Unit 2
10kW
Unit 3
10kW
L1
(A)
L2
(B)
L3
(C)
L1
L2
L3
L1
L2
L3
L1
L2
L3
