How it works?

A generator control unit.

This unit automatically matches the generator frequency and voltage levels with that of the bus, optionally 4 or 3 pole.

A synchro-check relay.

Performs the progressive functions of verifying voltage and phase angle conditions and ensuring that they are with preset limits, before allowing the breaker to close. The device is provided with control switches in the front panel, these switches are responsible for manual raising and voltage of the generator to match the bus frequency and voltage before synchronizing, voltmeters, and digital meters are also installed offer generator.