Bender VME420-D-2 Input module

The VME420 series voltage relays are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value required to trigger the alarm relay is stored. Due to adjustable response times, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. The relays require an external supply voltage. 

Typical applications

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

• Earth fault monitoring in medium-voltage systems via voltage transformers

• Monitoring of battery systems

• Switching machinery and equipment on and off at a certain voltage level

Once the supply voltage is applied, the start-up delay “t” begins. Measured voltage and frequency values changing during this time do not influence the switching state of the alarm relays. The devices feature two separately adjustable measuring channels (overvoltage/undervoltage). When the measuring quantity exceeds the response value (“Alarm 1”) or falls below the response value (“Alarm 2”), the time of the response delays “ton1/2” begins. Once the response delay has elapsed, the alarm relays switch and the alarm LEDs light up. When the measuring value exceeds or falls below the release value (response value plus hysteresis) after the alarm relays have switched, the selected release time “toff” begins. When “toff” has elapsed, the alarm relays switch back to their initial position. When the fault memory is activated, the alarm relays remain in alarm position until the reset button “R” is pressed. When the fault memory is set to continuous mode, the alarm parameters remain stored, even on failure of the supply voltage.

The structure and details of the product：

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