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4.6 Connecting (DC) master and slaves
WARNING
Risk of death by electrocution!
When working on the solar system, disconnect the inverter from the power
supply.
Make sure that the power supply cannot be unintentionally switched on.
Connect the slave units first, then connect the solar modules before turning on
the power supply.
•
Any socket inputs in the case of the junction box which do not have a cable
connection must be closed off with the seals supplied. This prevents moisture
from getting into the inverter.
•
There are no fuses in the inverter (power unit) itself. The fuses are located in
the junction box where the electrical mains connection is also housed. The
fuse specifications are shown in the "Troubleshooting" chapter.
•
Input voltage must never exceed 450 V DC. Higher input voltages will dam-
age 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 case (power
unit)! Opening the case will invalidate the warranty.
•
The cable routeing must be in accordance with the adjoining drawing.
The electrical PV connection is made to the StecaGrid via the plug connectors
on the case. The connectors are - provided that they are correctly fixed and dry
- contact proof.
On each StecaGrid there are positive and negative sockets in total for con-
nection of the modules. Each input has its own MPP tracker.
When only one input on the inverter is used the module string must be con-
nected to the right-hand sockets (input 1).
Mixing up the positive inputs (e.g. + from string 1 to + input ) within the same
inverter will not affect the operationability of the inverter. This is will however
also cause the inverter input numbers shown on the display to be the wrong
way round. To prevent possible confusion when looking for a problem the cor-
rect connection to both inputs should therefore be made.
When PV modules with a current of more than 8 A are used, both inputs can be
connected in parallel using a special T-splitter, also called Y-plug (not included
in the standard package). This way, modules with a maximum (MPP) current of
16 A can be connected. A T-splitter is not necessary for a negative connection
because both inputs are already internally connected in parallel. Just connecting
either of the two inputs with the module string will suffice.
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min. 15 cm
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