SMA STP 50-40 Operating Manual page 52

6 Electrical Connection
3. Secure the DC load-break switch against
reconnection using a padlock.
4. Measuring the voltage of the PV array. Ensure that the maximum input voltage of the inverter is
adhered to and that there is no ground fault in the PV system.
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. When this is
done, 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.
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.
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.
11. Insert the sealing plug into the DC plug connector.
52 STP50-4x-BE-en-23
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SMA Solar Technology AG
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Operating manual