PMVF20 – PMVF MODULAR MONITORING RELAYS

Why Choose the Lovato PMVF20 Interface Protection Unit?

The Lovato PMVF20 is a specialised interface protection system unit designed to monitor the connection between a local electricity generation system and the public low-voltage distribution network. It is suitable for applications such as photovoltaic installations, cogeneration systems and other distributed energy systems operating in parallel with the mains supply.

Designed for three-phase systems with or without neutral, the PMVF20 provides dual-threshold minimum and maximum voltage protection together with dual-threshold minimum and maximum frequency monitoring. If the monitored electrical parameters move outside the configured limits, the unit operates its relay outputs to initiate disconnection from the mains network.

The PMVF20 supports 230 V and 400 V AC systems and is compliant with the Italian CEI 0-21 interface protection requirements. This model is now listed by Lovato Electric as out of catalogue, so customers should contact LED Controls to confirm availability or discuss an appropriate replacement.

Key Advantages

• Dedicated interface protection unit for distributed generation systems.
• Suitable for three-phase systems with or without neutral.
• Dual-threshold minimum and maximum voltage monitoring.
• Dual-threshold minimum and maximum frequency protection.
• Designed for 230 V and 400 V AC low-voltage networks.
• Two relay outputs for interface protection and signalling functions.
• Compatible with current transformers featuring 1 A or 5 A secondary outputs.
• Compliant with the Italian CEI 0-21 standard.

Key Features

• Lovato PMVF series interface protection system.
• Three-phase voltage and frequency monitoring.
• Operation with or without a neutral conductor.
• Dual minimum-voltage thresholds.
• Dual maximum-voltage thresholds.
• Dual minimum-frequency thresholds.
• Dual maximum-frequency thresholds.
• Rated supply range of 100–400 V AC.
• Alternative supply range of 110–250 V DC.
• Current measurement using 1 A or 5 A current transformers.
• Two relay outputs for system control and protection.
• Suitable for photovoltaic and parallel generation applications.

Reliable Protection for Parallel Generation Systems

Electricity generation systems connected in parallel with the mains must be disconnected when network voltage or frequency moves outside permitted operating limits. The Lovato PMVF20 continuously supervises these parameters and controls an external interface device when an unacceptable condition is detected.

Its multiple voltage and frequency thresholds allow the protection response to be coordinated with the requirements of the connected generation system and distribution network. The unit is particularly suited to low-voltage renewable energy and cogeneration installations that require dedicated interface protection.

Typical Applications

• Photovoltaic generation systems.
• Low-voltage renewable energy installations.
• Cogeneration and combined heat and power systems.
• Distributed electricity generation.
• Parallel generator connections.
• Grid-connected industrial power systems.
• Interface protection control panels.
• Energy production and monitoring installations.