Orno OR-MT-ME-1809 Manual

The Orno OR-MT-ME-1809 is a precision multi-function energy meter designed for accurate measurement and monitoring of electrical parameters in single-phase systems. It features a large LCD display, Modbus communication protocol, pulse output, and DIN rail mounting. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Large backlit LCD display, DIN rail housing, Modbus RTU communication port, pulse output, voltage/current terminals.

Feature	Description
LCD Display	Shows voltage, current, power, energy, frequency, and power factor
Modbus RTU	RS-485 communication for data logging and remote monitoring
Pulse Output	Optically isolated pulse for energy measurement verification
Measurement Accuracy	Class 1.0 for active energy, Class 2.0 for reactive energy
Power Supply	85-265V AC/DC, wide range for versatile installation
Mounting	Standard DIN rail (35mm)
Inputs	Single-phase voltage and current (direct or via CT)
Operating Temperature	-25°C to +55°C
Dimensions	90mm x 70mm x 65mm (W x H x D)
Protection Class	IP40 for front panel

Installation

Unpack and inspect contents. Ensure power is disconnected before installation.

1. Mounting: Snap onto 35mm DIN rail in electrical cabinet.
2. Voltage Connection: Connect L and N wires to terminals 1 and 2.
3. Current Connection: Connect current transformer (CT) outputs to terminals 3 and 4, or direct input for lower currents.
4. Power Supply: Connect auxiliary power to terminals 7 (+) and 8 (-) if separate from measured voltage.
5. Communication: Connect RS-485 A/B wires to terminals 5 and 6 for Modbus network.

WARNING! Installation must be performed by qualified personnel. Ensure proper wiring to avoid electric shock or damage.

First-Time Setup

Apply power to the meter; the display will show startup sequence.

1. Display Check: Verify all LCD segments illuminate during power-on self-test.
2. Parameter Display: Use the front button to cycle through voltage, current, power, energy, frequency, and power factor.
3. CT Ratio Setting: If using current transformers, set the CT ratio via communication software or front panel (if supported).
4. Communication Address: Set unique Modbus address (default 1) using configuration software.
5. Energy Reset: Reset accumulated energy values if needed (requires password).

CAUTION! Do not open the meter casing. Internal components are not user-serviceable.

Specifications

• Model: OR-MT-ME-1809
• Supply Voltage: 85-265V AC/DC, 50/60Hz
• Measured Voltage: 80-300V AC
• Measured Current: 0-100A direct, or via CT (5A secondary)
• Accuracy Class: 1.0 (active energy), 2.0 (reactive energy)
• Display: LCD with backlight
• Communication: Modbus RTU via RS-485, 2400-19200 bps
• Pulse Output: 1000 imp/kWh (configurable), optically isolated
• Operating Temperature: -25°C to +55°C
• Storage Temperature: -40°C to +70°C
• Humidity: ≤ 93% RH, non-condensing
• Standards: IEC 62053-21, IEC 61010-1

Controls and Settings

Front Panel: Single button for display cycling. Configuration via Modbus communication.

Display Modes: Press button to cycle: Voltage (V) → Current (A) → Active Power (kW) → Reactive Power (kVAR) → Apparent Power (kVA) → Power Factor (PF) → Frequency (Hz) → Active Energy (kWh) → Reactive Energy (kVARh).

Modbus Registers: Configure via software: Address (1-247), Baud Rate (2400-19200), Parity (None/Even/Odd).

Pulse Output: Configurable constant (e.g., 1000, 2000, 10000 imp/kWh) for calibration.

Password Protection: Default password 0000 for protected settings.

Connecting Devices

Modbus Network: Connect multiple meters in daisy-chain via RS-485.

1. Ensure all devices share common ground and are powered off.
2. Connect RS-485 A (Data+) to terminal 5, B (Data-) to terminal 6.
3. Use shielded twisted pair cable, with shield grounded at one end.
4. Install 120Ω termination resistors at both ends of the network if distance >100m.
5. Connect pulse output to external counter or energy management system.

Tip: Keep communication cables away from power cables to avoid interference.

Reading Measurements

Real-time parameters displayed on LCD or read via Modbus.

1. Voltage: Display shows V, range 80-300V AC.
2. Current: Display shows A, based on CT ratio or direct input.
3. Power: Active (kW), Reactive (kVAR), Apparent (kVA).
4. Energy: Active energy (kWh) and reactive energy (kVARh) accumulated.
5. Power Factor: Display shows PF (lagging/leading).
6. Frequency: Display shows Hz (45-65Hz).
7. Maximum Demand: Records peak power over configurable period (if enabled).

WARNING! Do not exceed maximum input ratings. Use appropriate CTs for high currents.

Communication Setup

Modbus RTU protocol for integration with SCADA, PLC, or energy management software.

1. Install configuration software (provided by Orno).
2. Connect meter to PC via USB-to-RS485 converter.
3. Set communication parameters: Address, Baud Rate, Parity, Stop Bits.
4. Read registers: Voltage (30001), Current (30003), Active Power (30005), etc.
5. Write registers: CT Ratio (40001), Pulse Constant (40002), Password (40009).

Default Settings: Address=1, Baud=9600, Parity=None, Stop Bits=1.

Care & Cleaning

Disconnect power before cleaning. Use dry, lint-free cloth only; do not use liquids or chemicals.

CAUTION! Do not clean with abrasive materials. Ensure meter is completely dry before reapplying power.

Regulatory Information

CE Compliant: Meets EU EMC and LVD directives. RoHS Compliant: Free of hazardous substances. Manufactured under ISO 9001 quality system. Copyright © 2023 Orno. For technical support, visit www.orno.pl or contact [email protected].

Troubleshooting

Symptom	Possible Cause	Corrective Action
No display	No power	Check supply voltage connections; verify auxiliary power.
Incorrect voltage reading	Wrong connection	Verify L and N connections to terminals 1 and 2.
Zero current reading	CT connections/open circuit	Check CT wiring to terminals 3 and 4; ensure CT is not saturated.
Communication failure	Wrong parameters/cabling	Verify Modbus address, baud rate, parity; check RS-485 wiring and termination.
Pulse output not working	Configuration/load	Verify pulse constant setting; ensure external device impedance is compatible.

Reset: Use configuration software to restore factory defaults (requires password).

Service: [email protected]; www.orno.pl