BENDER VMD420-D-1 Voltage and Frequency Monitor

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BENDER VMD420-D-1 Voltage and Frequency Monitor 

Product Overview

The BENDER VMD420-D-1 is a digital voltage and frequency monitor designed for three-phase AC systems (up to 500V). It provides comprehensive protection against overvoltage, undervoltage, phase loss, asymmetry, and frequency deviations, making it ideal for industrial power distribution, generator protection, and motor control applications .

Key Features

1. Multi-Parameter Monitoring

   • Voltage: Over/under-voltage thresholds (adjustable) with true RMS measurement .

   • Frequency: Over/under-frequency detection (45–65 Hz typical range) .

   • Phase Faults: Detects phase loss, asymmetry, and incorrect phase sequence .

2. Advanced Display & Configuration

   • Digital 7-segment display for real-time values and menu-driven interface for threshold adjustments .

   • Two SPDT relay outputs (configurable for any alarm type) with adjustable time delays (0–10 sec) .

3. Robust Industrial Design

   • Auxiliary power supply (24V AC/DC or 110–230V AC).

   • Compact DIN-rail mounting (IP20 enclosure) .

4. Safety & Diagnostics

   • Locking/non-locking operation modes and built-in test/reset buttons .

   • Stores last trip values in memory for fault analysis .

Technical Specifications

Applications

• Generator protection (fixed/portable) .

• Motor phase-loss prevention .

• Industrial power distribution monitoring .

The structure and details of the product：

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