BENDER VME421H-D-1 monitoring relay

The BENDER VME421H-D-1 is a multifunctional monitoring relay designed to monitor voltage and frequency in AC/DC systems. It is part of Bender's LINETRAXX® VME421H series.

Here's a detailed description of its features and specifications:

Core Functionality:

• Voltage Monitoring: Monitors for undervoltage, overvoltage, and can also function as a window discriminator (monitoring voltage between two threshold values).

• Frequency Monitoring: Monitors for underfrequency and overfrequency.

• AC/DC Systems: Suitable for both alternating current (AC) and direct current (DC) applications.

• True RMS Measurement: Measures true RMS values for accurate readings, even with distorted waveforms.

Key Features:

• Integrated Energy Storage: The device is supplied by the system being monitored, eliminating the need for a separate external supply voltage. It has an integrated energy backup.

• LC Display: Features a multi-functional liquid crystal display (LCD) that continuously shows the current measured values. It also stores the measured value that triggered an alarm.

• Selectable Monitoring Functions: Users can select various monitoring functions like < U (undervoltage), > U (overvoltage), < f (underfrequency), > f (overfrequency).

• Adjustable Parameters:

• Response Times: Adjustable start-up delay, response delay, and delay on release to account for system-specific characteristics (e.g., brief voltage fluctuations during startup).

• Switching Hysteresis: Adjustable hysteresis for voltage and frequency to prevent rapid switching around the setpoint.

• Alarm Relays: Equipped with two separate alarm relays (each with a changeover contact) that can be configured for normally open (N/O) or normally closed (N/C) operation.

• Fault Memory: Stores the last alarm value, and the alarm relays can be set to latch until reset.

• Password Protection: Device settings can be protected by a password to prevent unauthorized changes.

• Preset Function: An automatic setting function for basic parameters (e.g., default undervoltage/overvoltage thresholds) can be enabled.

• LED Indicators: Includes LEDs for "Power On" (green), "Alarm 1" (yellow), and "Alarm 2" (yellow) to indicate status and alarm conditions.

• Continuous Self-Monitoring: The device continuously monitors its own functionality.

• Internal Test/Reset Button: Allows for internal testing and resetting of alarms.

• Compact Design: Two-module enclosure (36 mm width).

• Connection: Screw terminals or push-wire terminals (depending on the variant, D-1 typically refers to screw terminals, while B73010003 is for spring clamp terminals).

• RoHS-compliant: Complies with Restriction of Hazardous Substances directives.

Specific to VME421H-D-1:

• Voltage Measuring Range: AC/DC 0 - 150 V.

• Rated Frequency: DC, 15 - 460 Hz.

• Under/Overvoltage Setting Range: 9.6 - 150 V.

• Under/Overfrequency Setting Range: 10 - 500 Hz.

Applications:

• Voltage and frequency monitoring of single-phase machines and electrical installations.

• Monitoring of battery systems.

• Earth fault monitoring in medium-voltage systems (via voltage transformers).

• Switching machinery and equipment on/off at specific voltage levels.

• Dump load controller.

• Window voltage monitoring (simultaneous overvoltage and undervoltage monitoring).

Overall, the BENDER VME421H-D-1 is a robust and versatile monitoring relay, widely used in industrial and electrical systems for ensuring reliable operation and protection against voltage and frequency deviations.

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