Connecting the equipment grounding conductor
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.
- Ensure that the DC installation is carried out correctly and no ground fault occurs during operation.
Requirements:
-
One PV combiner box must be available.
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 equipment grounding conductor must be inserted in the product.
Additionally required material (not included in the scope of delivery):
One terminal lug for connection of equipment grounding conductor of PV array (flange hole: M6, cross-section: appropriate to equipment grounding conductor)
Clean cloth
Ethanol cleaning agent
Press tool
Procedure:
- Ensure that no voltage is present on the DC cables.
- Dismantle the equipment grounding conductor.
- Attach a terminal lug to the equipment grounding conductor.
- Clean the contact surfaces of the terminal lug using a clean cloth and ethanol cleaning agent and do not touch the contact surfaces after cleaning.
- Connect the equipment grounding conductor to the equipment grounding terminal using the hexagon socket screw (M6x16, TX20, torque: 6 Nm ± 0.3 Nm (53 in-lb ± 2.65 in-lb)).