Connecting the PV Array


Qualified person

NOTICE

Destruction of the inverter due to overvoltage

If the open-circuit voltage of the PV modules exceeds the maximum input voltage of the inverter, the inverter can be destroyed due to overvoltage.

  1. If the open-circuit voltage of the PV modules exceeds the maximum input voltage of the inverter, do not connect any strings to the inverter and check the design of the PV system.

WARNING

Danger to life due to electric shock from destruction of the measuring device due to overvoltage

Overvoltage can damage a measuring device and result in voltage being present in the enclosure of the measuring device. Touching the live enclosure of the measuring device results in death or lethal injuries due to electric shock.

  1. Only use measuring devices with a DC input voltage range of 1000 V or higher.

NOTICE

Damage to the DC connectors due to the use of contact cleaner of other cleaning agents

Some contact cleaners or other cleaning agents may contain substances that decompose the plastic of the DC connectors.

  1. Do not use contact cleaners or other cleaning agents for cleaning the DC connectors.

NOTICE

Damage to the inverter due to ground fault on DC side during operation

Due to the transformerless topology of the product, the occurance of ground faults on DC side during operation can lead to irreparable damage. Damages to the product due to a faulty or damaged DC installation are not covered by warranty. The product is equipped with a protective device that checks whether a ground fault is present during the starting sequence. The product is not protected during operation.

  1. Ensure that the DC installation is carried out correctly and no ground fault occurs during operation.

Procedure:

  1. Ensure that the circuit breaker is switched off and that it cannot be reconnected.
  2. If an external DC load-break switch is installed, disconnect the external DC load-break switch from all voltage sources.
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  4. Set the DC load-break switch of the inverter to position O.
  5. 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.
  6. Check whether the DC connectors have the correct polarity.
  7. 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.

  8. Ensure that the open-circuit voltage of the PV array does not exceed the maximum input voltage of the inverter.
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  10. Connect the assembled DC connectors to the inverter.
  11. The DC connectors snap into place.
  12. Ensure that all DC connectors are securely in place.
  13. 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.

    1. 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.
  14. For unused DC connectors, push down the clamping bracket and push the swivel nut up to the thread.
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  16. Insert the sealing plug into the DC connector.
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  18. Insert the DC connectors with sealing plugs into the corresponding DC inputs on the inverter.
  19. The DC connectors snap into place.
  20. Ensure that the DC connectors with sealing plugs are securely in place.