User Manual for Senva EMX and EMX-L Energy Meter

Quick Guide from the Manual

The Senva EMX and EMX-L are 3-channel True RMS energy meters designed for revenue-grade monitoring. The EMX includes a display, logging, and RTC, while the EMX-L is a streamlined version that relies on the SenvaSync app for configuration and data. Both units support BACnet MS/TP and Modbus RTU protocols.

Product Overview

The EMX series is suitable for T35 DIN rail mounting. The EMX features an OLED screen for local monitoring and configuration, whereas the EMX-L requires the SenvaSync app (available on Apple and Android stores) for all operations.

Installation and Mounting

The meter is designed for T35 DIN rail installation. Place the unit centered over the rail and press upward until it clicks into place. To remove, use a flat-nose screwdriver to pull the top tab and apply downward pressure until the unit is flush and the tab releases.

Wiring

Important: Connections labeled "Class 2" must be permanently separated from those labeled "Class 1" by a minimum of 6 mm. Always disconnect power from the distribution system before installing or servicing current transformers (CTs).

The EMX accepts 0.333V voltage output or di/dt signal CTs. Ensure the wiring method corresponds to the selected connection type (1-phase or 3-phase) as detailed in the wiring diagrams provided in the manual.

Operation and Configuration

Upon applying power, the OLED screen displays the summary page. Use the up and down arrows to cycle through system measurements.

Power Setup: Press the enter button to access the Metering Menu. You must select the connection type (e.g., 3-phase ABCN or 1-phase ABN) to match your wiring. Select the current element type (CT or Rogowski Coil) and set the current scale (Amps per 0.333 volt).

RS485 Setup: Access the Communication Menu to configure the network protocol (BACnet MS/TP or Modbus RTU), device address, baud rate, parity, and stop bits.

Troubleshooting

If a red exclamation mark appears on the OLED, check the alarm menu. Common issues include:

• Phase Loss: Check all phase voltages and current.
• Low Power Factor: Ensure voltage legs match with CTs (PF < 0.5).
• Frequency Range: Ensure frequency is between 45Hz and 65Hz.
• Voltage Range: Ensure system voltage does not exceed 600VAC.
• Current Range: Replace with a larger amperage rated CT.
• Pulse overrun: Increase Wh per pulse or decrease pulse duration.

If the issue persists, contact Senva technical support at [email protected] or (866) 660-8864.

Specifications

The EMX series operates on 90-600VLL power supply. It features 2 pulse inputs and 2 pulse outputs (solid state dry contact). The operating temperature range is -22 to 158°F (-30 to 70°C) with an IP20 environmental rating (front display IP40).