Monitoring relay VRSC1-28

• This unit compares the voltage, frequency and phase angle of two supplies and operates a relay according to the synchronicity of the supplies. If the two supplies cease to match, the relay operates to provide
a control output. The relay output can be used for alarm or control purposes.
• The unit also provides a dead bus function. If the bus supply fails, the
relay operates and the output can be used to switch in an emergency
generator. LEDs indicate power on, relay and dead bus status.
• Controls on the front panel set the trip points at which the relays and
LEDs operate:
• Degree of synchronicity Ux (%Volts)
• Nominal voltage (Un)
• Dead bus function on/off
• The unit is powered from the generator supply.
• These instructions contain important safety information. Please read
them thoroughly before commissioning, operating or maintenance of
the unit.