BENDER VMD420-D-1

BENDER VMD420-D-1 Product Details

The BENDER VMD420-D-1 is a multi-functional voltage and frequency monitoring relay designed for 3(N)AC systems up to 500 V. It monitors for undervoltage, overvoltage, underfrequency, overfrequency, phase sequence, phase failure, and asymmetry. The device measures the RMS values of the voltages, and the current measured value is continuously displayed on the LC display. The value that triggers the alarm relay is stored. Adjustable response times allow for consideration of system-specific characteristics. An external supply voltage is required for operation.

Product Parameters

• Supply Voltage (Us): AC 16...72 V / DC 9.6...94 V, 15...460 Hz

• Measuring Range (L-N): AC 0...288 V

• Measuring Range (L-L): AC 0...500 V

• Rated Frequency (fn): 15...460 Hz

• Frequency Display Range: 10...500 Hz

• Undervoltage (< U): AC 6...500 V / 6...288 V (adjustable)

• Overvoltage (> U): AC 6...500 V / 6...288 V (adjustable)

• Asymmetry: 5...30 % (adjustable)

• Underfrequency (< f): 10...500 Hz (adjustable)

• Overfrequency (> f): 10...500 Hz (adjustable)

• Start-up Delay (t): Adjustable

• Response Delay (ton): Adjustable

• Delay on Release (toff): Adjustable

• Switching Hysteresis (U/f): Adjustable

• Alarm Relays: 2 separate changeover contacts (SPDT), selectable N/C or N/O operation, selectable fault memory behavior.

• Mounting: 2-module enclosure (36 mm)

• Terminals: Push-wire terminals (two terminals per connection) or screw-type terminals (depending on the version)

• Display: Multi-functional LC display for digital measured value indication

• LEDs: Power On, Alarm 1, Alarm 2

• Protection Degree: IP20 (terminals), IP40 (front panel)

• Rated Insulation Voltage: 400 V

• Rated Impulse Voltage/Pollution Degree: 4 kV / III

• Power Consumption: ≤ 3.5 VA

• Weight: Approximately 0.22 kg

Product Advantages

• Multi-functional monitoring: Monitors voltage and frequency for various fault conditions in 3(N)AC systems.

• Adjustable parameters: Offers flexibility with adjustable start-up delay, response delay, delay on release, and switching hysteresis to suit different applications.

• Clear indication: Digital LC display provides continuous indication of the measured value, and alarm LEDs signal fault conditions.

• Fault memory: Selectable fault memory behavior allows for latching or automatic reset upon fault clearance.

• Versatile alarm relays: Two separate alarm relays with configurable N/C or N/O operation for flexible integration into control circuits.

• Password protection: Prevents unauthorized changes to device settings.

• Compact design: Two-module enclosure saves space in the electrical panel.

• Easy installation: Push-wire or screw-type terminals for convenient wiring.

• Preset function: Automatic assignment of basic parameters upon initial connection simplifies commissioning.

• Continuous self-monitoring: Ensures reliable operation.