Connecting The Strings (Dc); Connecting Optional Accessories - Steca Grid 8000 3ph Instructions D'installation Et De Service

1 2 3 4
6 5
1 AC socket
2 DC circuit breaker
3 Negative inputs
(StecaGrid 8000 3ph / 10000 3ph: 3x / 5x)
4 Positive inputs
(StecaGrid 8000 3ph / 10000 3ph: 3x / 5x)
5 Air inlet
6 Slot for interface card
EN

4.5 Connecting the strings (DC)

Danger
Risk of death by electrocution!
When working on the solar power system, disconnect the inverter from the AC
X
power supply.
The AC connector should not be used to disconnect the power supply.
X
Turn the DC switch to off.
X
Make sure that the power supply cannot be unintentionally switched on.
X
All socket inputs in the casing of the inverter which do not have a cable con-
•
nection must be closed off with the covers supplied. This ensures that the in-
verter complies with protection degree IP54.
• The DC connector can be connected in any sequence because all inputs are
interlinked internally.
• The input voltage must never exceed 845 V DC.
Higher input voltages will damage the inverter.
Here, please note the temperature dependence of the open circuit voltage of
the solar modules.
• It is not necessary and also not permitted to open the inverter casing! Open-
ing the casing will invalidate the guarantee.
Each inverter has 3 positive and 3 negative sockets (StecaGrid 8000 3ph) or 5 pos-
itive and 5 negative sockets (StecaGrid 10000 3ph) for connecting the modules.
All inputs are internally interlinked to one MPP tracker.
String fuses cannot be installed into the inverter. If string fuses are required be-
cause otherwise the parallel connection would cause the return current flow re-
sistance to be exceeded, they must be installed externally.

4.6 Connecting optional accessories

4.6.1 Connecting the data cables
1. Connect all the inverters in the system using the data cables provided. The fol-
lowing applies:
- The cable plugs must latch into place.
- One RJ45 socket remains free at the first and last inverters in the chain.
- One data cable is left over.
2. Switch on the termination at the interface card of the last inverter; see chap-
ter Settings on the inverter interface card.
3. Plug the remaining RJ45 cable into the StecaGrid Vision and the free RJ45
socket of the first inverter
or plug the alternative data cable into the COMBICON socket of the
StecaGrid Vision and a free RJ45 socket on the first inverter
or connect an external data logger to a free RJ45 socket of the first inverter
using a cable conforming to the manufacturer's specifications.
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