Monitoring relay VROU3-28

  • UNDER AND OVER VOLTAGE MONITORING RELAYS
  • THESE UNIT MONITOR A 3-PHASE 3-WIRE SUPPLY AND OPERATE RELAYS IF A PHASE-PHASE VOLTAGE GOES BELOW OR ABOVE SET LEVELS.
  • LEDS INDICATE POWER ON AND TRIP STATUS. A RELAY WITH TWO CHANGEOVER VOLT-FREE CONTACTS IS FITTED.
  • FRONT LEVEL CONTROLS ALLOW SELECTION OF:
    • UNDER- AND OVER-VOLTAGE TRIP LEVELS
    • NOMINAL RATED VOLTAGE
    • DIFFERENTIAL VOLTAGE FOR OPERATING HYSTERESIS AND TIME DELAY BEFORE A TRIP TRIGGERS A RELAY RESPONSE.

• These units monitor a 3-phase 3-wire supply and operate relays if a
phase-phase voltage goes below or above set levels. Front panel controls allow selection of:
• Under- and Over-voltage trip levels,
• nominal rated voltage,
• diff erential voltage for operating hysteresis and
• time delay before a trip triggers a relay response.
• LEDs indicate power on and trip status. A relay with two changeover
volt-free contacts is fi tted.
• These instructions contain important safety information. Please read
them thoroughly before commissioning, operation or maintenance of
the unit.

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