Connecting central grid and system protection

Central grid and system protection is required in some countries. This monitors the voltage and frequency in the grid and in the event of a fault, shuts down the photovoltaic systems by means of a circuit breaker.

If your energy supplier requires central grid and system protection for your system, install an external monitoring device, which switches off the inverter via a normally closed contact. An additional circuit breaker is not needed because the shutdown is ensured by the double internal switches in the inverter.

1

Terminal X403

2

Control line from grid and system protection to inverter

3

External source of energy

4

Control unit for grid and system protection

5

Switching contact of control unit for grid and system protection

 

DANGER

danger

Risk of death due to electrical shock and discharge!

  • De-energise device and secure against being switched on again.

Perform the following steps:

  1. Switch the DC switch on the inverter to OFF.
  2. De-energise the house grid and secure it against being switched back on.
  3. Fit the central grid and system protection in the control cabinet or power distributor.
  4. Correctly route the communication cable from the inverter to the control cabinet and connect to the central grid and system protection following the wiring diagram provided by the manufacturer.

  5. INFO

    Info

    Signal cable requirements:

    • wire cross-section from 0.34 to 1.5 mm² (rigid) or 0.34 to 1.0 mm² (flexible)
    • bus length max. 30 m
    • length of stripped insulation approx. 7.5 mm
  6. Connect communication cable in inverter to X403 terminal for central grid and system protection.
  1. The central grid and system protection is connected.

 

After commissioning

  1. Once the inverter has undergone initial commissioning, the central grid and system protection must be configured in the Webserver.

    The function can be activated by going to Service > General > CEI inputs/VDE > VDE (circuit breaker).
  1. Inverter set up for grid and system protection function.