3-phase energy meters

08 December 2016

Carlo Gavazzi has introduced the EM340 3 phase energy meter, the first in the EM300 Series which uses touch screen technology to make standard user operations, such as page scrolling, programming and parameter checks simpler and faster, as well as, easier to read.

The EM340 three-phase energy meter with 3x8 digit backlit LCD data display and integrated keypad is suited to active energy metering and cost allocation in applications up to 65A (direct connection) and dual tariff management. It is optionally provided with pulse output, RS485 Modbus port or M-bus port and is only 3 DIN wide. 

Installation is quick and simple, due to the meter’s self-power supply from the voltage reference inputs, automatic phase detection with wrong-phase-sequence warning and fast application-oriented programming procedure.

A selection of variables can be programmed providing active and reactive energy measurement. Options include: System variables such as kW, kvar, kVA, VLL, VLN, PF, Hz, kWdmd, kWdmd peak; phase variables including kW, kvar, kVA, VLL, VLN, A, PF; energy measurement: kWh and kvarh (imported/ exported); kWh+ by 2 tariffs; kWh per phase.

Instantaneous variables are displayed as 3 x 4 digits, with energy meter readings to 8 digits. Accuracy is ±0.5% RDG (V, A), and the meter is rated Class B (kWh) according to EN50470-3 and Class 1 (kWh) of EN62053-21.

The meters are available as MID certified. The European Union’s Measuring Instruments Directive (MID) is designed to guarantee the accuracy and reliability of meters.

This is particularly significant for building owners with multi-occupancy models where individual tenants are billed via sub-metering. Meters are designed to be fully tamper-proof when correctly fitted with password protection and sealable or lockable covers are certified (Annex B+D) both in version PFA (easy connection) and PFB (bidirectional with approved imported energy meter) for billing applications.

The EM100 and EM300 series of energy meters are said to ensure optimal performance in industries such as conventional energy, building automation, HVAC and sub metering applications such as shopping malls, public buildings, public lighting and charging poles, commercial buildings, light and medium industries, lift and elevators and agricultural applications.