• These units monitor a 3-phase 4-wire supply and operate relays if a
phase-neutral voltage goes below set levels. Front panel controls allow
selection of:
• 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
Monitoring relay VRO3N-28
- OVER VOLTAGE MONITORING RELAYS
- THESE UNITS MONITOR A 3-PHASE 4-WIRE SUPPLY AND OPERATE RELASY IF A PHASE-NEUTRAL VOTAGE GOES BELOW SET LEVEL.
- LEDS INDICATE POWER ON AND TRIP STATUS. A RELAY WITH TWO CHANGEOVARS VOLT-FREE CONTACT IS FITTED.
- FRONT PANEL CONTROLS ALLOW SELECTION OF:
- UNDER VOLTAGE TRIP LEVELS.
- NOMINAL RATED VOLTAGE.
- DIFFERENTIAL VOLTAGE FOR OPERATING HYSTERESIS AND TIME DELAY BEFORE A TRIP TRIGGERS A RELAY RESPONSE.
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