Connecting central grid and system protection

1

COM plug

2

Inverter COM connection

3

Grid and system protection - Switch closed: Feed-in, Switch open: Feed-in prevented

4

Activation of grid and system protection via KOSTAL PIKO CI app

5

Relay in the event of great distances

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)
  • bus length max. 1000
  • length of stripped insulation approx. 7.5 mm
  1. De-energise the mains cable.
  2. Mount the monitoring device in the control cabinet or power distributor.
  3. Use a relay in the event of great distances between monitoring unit and inverter.
  4. Correctly route the communication cable from the inverter to the control cabinet and connect following wiring diagram provided by manufacturer.
  5. Guide the communication cable through the communication plug and seal provided.
  7. Fit the communication cable on the inverter plug.
  9. Assemble plug and tighten union nut to the prescribed tightening torque.
    Tightening torque: 3 Nm.
  10. Connect the plug to the interface in the COM connection panel.

 

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.