Connecting central grid and system protection

Central grid and system protection with circuit breaker

1

Inverter

2

Connection

3

Grid and system protection

Switch closed: Feed-in

Switch open: Feed-in prevented

4

Activate the grid and system protection using the KOSTAL PIKO CI Conf App.

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 open or normally closed contact. An additional circuit breaker is not necessary because of the internal switches in the inverter.

Connection

DANGER

danger

Risk of death due to electrical shock and discharge!

De-energise all devices and secure them against being switched on again.

INFO

Info

Requirements of communication cable:

  • Wire cross-section from 0.34 to 1.5 mm² (rigid) or 0.34 to 1.0 mm² (flexible)
  • Length max. 30
  • Length of stripped insulation approx. 5 mm
  1. De-energise the mains cable.
  2. Mount the monitoring device in the control cabinet or power distributor.
  3. Correctly route the communication cable from the inverter to the control cabinet and connect following wiring diagram provided by manufacturer.
  4. Pass the communication cable through the cover for the COM2 connection panel. Seal connection with sealing ring and union nut.
  5. Connect the communication cable to the plug connector for the communication interface. Please note the pin assignment.
    Tightening torque: 0.2 Nm.
  6. Connect plug connector on inverter to communication interface in COM2 connection panel.

1

COM2 connection panel

2

Communication interface

3

Plug connector

After commissioning

  1. After commissioning, the function must be activated in each inverter using the KOSTAL PIKO CI Conf App.
    This can be activated under Settings > Basic settings > External shutdown > ON.
  1. Inverter set up for grid and system protection function.