The DEIF RMV-112D is a high-precision voltage monitoring relay designed for the protection of generators, motors, and transformer feeders against abnormal voltage conditions. This DIN-rail mounted module serves as a critical safety component in power management systems, providing reliable detection of both undervoltage and overvoltage states. The RMV-112D is engineered to prevent equipment damage caused by voltage fluctuations, ensuring the stability and longevity of industrial electrical networks.

 

Product Parameters & Datasheet

The RMV-112D is built for accuracy and versatility in AC voltage monitoring.

 

Technical Description

The DEIF RMV-112D operates as a “window” comparator that continuously monitors the RMS value of the input AC voltage. The unit features two independent setting potentiometers: one for the overvoltage trip point and one for the undervoltage trip point. A built-in adjustable time delay prevents nuisance tripping caused by momentary voltage spikes or transients during motor starting. The relay utilizes a “fail-safe” principle; the output relays are energized during normal voltage conditions and de-energize (drop out) when a fault occurs or when control power is lost, providing an additional layer of system safety.

 

Country of Origin

This protection relay is designed and manufactured in Denmark by DEIF A/S, adhering to the highest global standards for marine and land-based power automation (CE, UL, and various Marine Classifications).

 

Application Fields

The RMV-112D is widely utilized in mission-critical power environments:

• Generator Protection: Safeguarding alternators from sustained overvoltage during load rejection.
• Marine Switchboards: Monitoring busbar voltage on ships to ensure stable power for propulsion and navigation.
• Industrial Motors: Protecting large AC motors from overheating due to undervoltage conditions.
• Renewable Energy: Voltage monitoring for wind turbine and solar farm grid-tie systems.
• Infrastructure: Ensuring stable voltage levels for telecommunications hubs and water treatment facilities.

Product Usage Instructions

1. Installation: Snap the RMV-112D onto a standard DIN rail. For high-vibration environments, use end-stops to secure the module firmly.
2. Wiring: Connect the phase and neutral lines to the measuring terminals. Ensure the voltage levels match the rating indicated on the side label of the relay.
3. Threshold Setting: Use a small screwdriver to adjust the Uhigh​ and Ulow​ potentiometers to the desired percentage of the nominal system voltage.
4. Delay Tuning: Set the time delay (t) to a value that ignores known system transients but still provides rapid protection during genuine fault conditions.
5. Status Monitoring: Observe the front-panel LEDs. A green “Power” LED indicates the unit is active, while red LEDs indicate which specific trip condition (U< or U>) has been met.