EEM-MA371-R - Meter

EEM-MA371-R has three measurement inputs RC1, RC2 and RC3 designed for direct connection of Rogowski coils.

The device supports two measurement levels: up to 400 A and up to 4000 A, allowing it to be used for both standard circuits and high-energy loads.

When using a Phoenix Contact coil, the transmission factor is 100 mV / 1000 A, and the input voltage range of the measurement path is from 500 µV to 400 mV.

Rogowski coils can be installed around existing conductors or busbars without having to route the conductor through the closed core of a conventional transformer.

This solution is particularly well suited to expansion and retrofit of existing distribution boards and installations where access to the main current paths is limited.

Direct connection of the coils to EEM-MA371-R also reduces the number of additional measurement components and simplifies wiring.

EEM-MA371-R is suitable for operation in three-phase 3- and 4-wire networks, two-phase networks and single-phase networks.

All values are measured according to the principle of continuous True RMS measurement, allowing distorted voltage and current waveforms to be analyzed correctly as well.

The fundamental frequency range is from 45 to 65 Hz.

EEM-MA371-R has three voltage inputs V1, V2 and V3 for monitoring the parameters of individual phases.

The direct measurement range is 18–690 V AC phase-to-phase and 11–400 V AC phase-to-neutral.

External voltage transformers can also be used for installations requiring measurement of a higher primary voltage.

EEM-MA371-R measures current with an accuracy of 0,5%, while power measurement accuracy is 1%.

Active energy measurement meets the requirements class 1 according to IEC 62053-21.

Reactive energy is measured in class 2 according to IEC 62053-23.

The meter enables analysis of higher voltage and current harmonics up to the 63rd harmonic.

This makes it possible to identify distortions generated by inverters, variable-speed drives, switched-mode power supplies and other nonlinear loads.

Harmonic information can be used during installation diagnostics, power quality analysis and identification of sources of additional energy losses.

EEM-MA371-R has a Ethernet RJ45 operating at 10 or 100 Mb/s.

Protocol Modbus TCP enables measurement values to be transmitted to PLC controllers, SCADA systems, BMS and energy management systems.

Interface REST API via HTTP also enables integration of the device with applications and IT systems.

The EEM-MA371-R version has an additional RS-485 with Modbus RTU protocol.

This enables direct connection of the meter to existing serial buses used by controllers, data concentrators and automation systems.

The RS-485 transmission speed can be configured in the range from 2.4 to 115.2 kb/s, and the device has an integrated 120 Ω terminating resistor.

EEM-MA371-R has one digital input compliant with IEC/EN 61131-2 Type 3.

The input operates with a 24 V DC signal and a voltage range from 0 to 30 V DC.

The device also has one 24 V DC digital output with a maximum current of 100 mA.

The meter has backlit, two-color, multi-line LCD display, enabling local viewing of the most important installation parameters.

The integrated web server allows the device to be configured using a standard web browser.

A guided step-by-step installation wizard simplifies configuration of network topology, measurement parameters and communication.

EEM-MA371-R is designed for mounting on a horizontal DIN rail in electrical distribution boards and control cabinets.

The enclosure dimensions are 90 × 90 × 71,9 mm and a width corresponding to 5 modules.

The enclosure has an IP20 protection rating, while the display area has an IP40 protection rating.