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6 Electrical Connection
SMA Solar Technology AG
Operating manualSTP3-6-3AV-40-BE-en-1234
2. If an external DC load-break switch is installed, disconnect the external DC load-break switch
from all voltage sources.
3. Set the DC load-break switch of the inverter to
position O.
4. Measure the PV array voltage. Ensure that the maximum input voltage of the inverter is
adhered to and that there is no ground fault in the PV array.
5. Check whether the DC connectors have the correct polarity.
If the DC connector is equipped with a DC cable of the wrong polarity, the DC connector must
be reassembled. The DC cable must always have the same polarity as the DC connector.
6. Ensure that the open-circuit voltage of the PV array does not exceed the maximum input
voltage of the inverter.
7. Connect the assembled DC connectors to the
inverter.
+
+
_
The DC connectors snap into place.
8. Ensure that all DC connectors are securely in place.
9.
NOTICE
Damage to the product due to sand, dust and moisture ingress if the DC
inputs are not closed
The product is only properly sealed when all unused DC inputs are closed with DC
connectors and sealing plugs. Sand, dust and moisture penetration can damage the product
and impair its functionality.
Seal all unused DC inputs using the DC connectors and sealing plugs as described in
the following. When doing so, do not plug the sealing plugs directly into the DC inputs
on the inverter.
10. For unused DC connectors, push down the clamping bracket and push the swivel nut up to the
thread.
34


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