Page 29
EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
ELR 9000 Series
2.3.4 Mains connection (AC)
•
Connection to an AC mains supply may only be carried out by qualified personnel!
•
Cable cross section must be suitable for the maximum input/output current of the device (see
table below)!
•
Before plugging in the input plug ensure that the device is switched off by its mains switch!
•
Ensure that all regulations for the operation of and connection to the public grid of energy
back-feeding equipment have been applied and all necessary conditions have been met!
•
When operating multiple ELR units in parallel on the same grid, the cross section of the AC cables
has to match the increased output current from the energy recovery, especially the N conductor!
The equipment is delivered with a 5 pole mains plug. Depending on model, this will be connected with a 2-phase
or 3-phase mains supply, which has to be connected according to the labelling on the plug and the table below.
Required for the mains connection, with or without AIU (automatic isolation unit, monitoring the mains for correct
energy recovery), are following phases:
Without AIU
With AIU
Nominal power Supply connector Supply type
Supply connector
Supply type
3500 W
L2, N, PE
Single phase (wall etc.) L1, L2, L3, N, PE
Three-phase
7000 W
L1, L3, N, PE
Three-phase
L1, L2, L3, N, PE
Three-phase
10500 W
L1, L2, L3, N, PE
Three-phase
L1, L2, L3, N, PE
Three-phase
>10500 W
L1, L2, L3, N, PE
Three-phase
L1, L2, L3, N, PE
Three-phase
The N conductor is imperative and must always be wired!
If using an automatic isolation unit (AIU), all phases of a three-phase supply are required, be-
cause the mains monitoring feature of the AIU always monitors on three phases.
For the dimensioning of the wiring
cross section
the power of the device and the cable length are decisive. The
maximum output current of the energy recovery feature per phase is calculated by the formula I
AC
= Nominal power
* Efficiency / 230 V. The table below tells the maximum output current of every phase, as well as the recommended
minimum cross section (for up to 5 m cable length).
Based on the connection of a
standalone unit
:
L1
L2
L3
N
Nominal power
ø
I
max
ø
I
max
ø
I
max
ø
I
max
3500 W
-
-
1.5 mm²
16 A
-
-
1.5 mm²
16 A
7000 W
1.5 mm²
16 A
-
-
1.5 mm²
16 A
1.5 mm²
16 A
10500 W
1.5 mm²
16 A
1.5 mm²
16 A
1.5 mm²
16 A
1.5 mm²
16 A
The included connection plug can receive cable ends of up to 4 mm². The longer the connection cable, the higher
the voltage loss due to the cable resistance. If the voltage loss is too high then the feedback will not function reli-
ably or not at all. Therefore the mains cables should be kept as short as possible.
Figure 7 - Example for a supply connection cable (cable not included in the delivery)
