Connecting the Inverter to the Utility Grid


Qualified person

Requirements:

  • The connection requirements of the grid operator must be met.

  • The grid voltage must be within the permissible range. The exact operating range of the inverter is specified in the operating parameters.

Procedure:

  1. Disconnect the miniature circuit breaker from all 3 line conductors and secure against reconnection.
  2. Ensure that the DC load-break switch is in the O position and is secured against reconnection.
  3. 2309513484
  4. If the enclosure lid of the AC Connection Unit is mounted, remove all 10 screws of the enclosure lid using a Torx screwdriver (TX25) and remove the enclosure lid towards the front.
  5. Remove the adhesive tape from the enclosure opening for the AC connection.
  6. 2313088140
  7. Insert the cable gland M63 into the opening and tighten it with the counter nut from the inside.
  8. Thread the AC cable through the cable gland into the AC Connection Unit. If necessary, slightly loosen the swivel nut of the cable gland. In case of AC cables that require a clamping area < 35 mm, replace the seal insert of the cable gland M63 by the seal insert with reduced clamping range.
  9. Dismantle the AC cable.
  10. Strip off the insulation of L1, L2, L3, N and PE by 30 mm.
  11. 2313088524
  12. Connect the grounding conductor to the ground terminal. Use a Torx screwdriver (TX 25) to slightly loosen one of the screws with which the clip and connection plate are connected to the ground connection and to completely remove the other screw. Then place the grounding conductor onto the connection plate, route the clip via the grounding conductor and tighten both screws with a Torx screwdriver (TX 25) (torque: 6 Nm).
  13. Ensure that the conductor is on the connection plate.
  14. 2313088908
  15. Connect L1, L2, L3 and, if necessary, N to the terminals according to the label. To do so, position each conductor as far as they will go into the corresponding terminal and tighten the screw of the terminal using an Allen key (AF 8, length: 50 mm) (20 Nm torque for a conductor cross-section of 35 mm² to 95 mm²; 30 Nm torque for a cable cross-section of 120 mm²).
  16. WARNING

    Danger to life due to electric shock

    The inverter is delivered with a bridge between N and the enclosure as standard. The bridge is absolutely essential if the connection to a utility grid is established without a neutral conductor.

    1. If the connection to a utility grid is established with a neutral conductor, the bridge must always be removed as described in the next step.
    2363769484
  17. When N is present and connected to the corresponding terminal, remove the bridge installed as standard between N and the enclosure (). To do so, unscrew the screw of the terminal N and the screw of the grounding point () using an Allen key (AF 8, length: 50 mm) and remove the bridge from the inverter.
  18. Ensure that the correct conductors are assigned to all the terminals.
  19. Make sure that all conductors are securely in place.