Connecting the DC Cables

Qualified person

NOTICE

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

Due to the transformerless topology of the product, the occurrence 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.

Requirements:

  • Depending on the design, one or two PV combiner boxes must be present.

  • There must be an external DC load-break switch between the PV inverter and the PV modules (e.g. a PV combiner box including a load-break switch).

  • The DC cables must be inserted into the product.

Additionally required material (not included in the scope of delivery):

  • For the connection of 1 PV combiner box: 2 terminal lugs (flange hole: M10 or M12, cross-section: appropriate to DC cables used)

  • For the connection of 2 PV combiner boxes: 4 terminal lugs (flange hole: M10 or M12, cross-section: appropriate to DC cables used)

  • Clean cloth

  • Ethanol cleaning agent

  • Press tool

Procedure:

  1. Ensure that no voltage is present on the DC cables.
  2. Dismantle the DC cables.
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  3. Fit terminal lugs to the DC conductors.
  4. Remove any cable remnants from the product.
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  5. Remove the fixing of the pre-harnessed DC cables from the product.
  6. Clean the contact surfaces of all terminal lugs using a clean cloth and ethanol cleaning agent and do not touch the contact surfaces after cleaning.
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  7. Connect the DC cables with each other. To do this, insert the screw and washer assembly (M10x40) from behind through the round holes in the terminal lugs and tighten it from the front with the washer (M10) and the hex nut (SW16, torque: 24 Nm ± 2 Nm). Ensure correct polarity.
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  8. Place the touch protection elements around the terminal lugs and plug together until they audibly click into place.
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