MULTISPAN EM-10 - User Manual

The Multispan EM-10 is a 3-phase energy meter designed for accurate measurement and display of electrical parameters in industrial and commercial applications. It features a compact design with a 96x96mm panel cutout, making it suitable for integration into various control panels. The device is equipped with a 6-digit/line, 7-segment, 0.56-inch red LED display for clear visibility of readings.

Function Description:

The EM-10 primarily functions as an energy meter, measuring and displaying both active power (KW) and active energy (KWH). It is designed for 3-phase, 4-wire systems and can operate with a voltage input of up to 250V AC. Current measurement is achieved through external Current Transformers (CTs), allowing for flexibility with various current ratings (5 Amp or higher). The device supports a wide range of CT ratios, selectable up to 4000/5 Amp AC.

Important Technical Specifications:

Model: EM-10
Display: 6 Digit/Line, 7-segment, 0.56-inch red LED Display
Size (H x W x D): 96mm x 96mm x 50mm
Panel Cutout: 92mm x 92mm
Voltage Input: 250V AC
Current Input: 5 Amp or higher through external CT
Active Power (KW) Range: 0000-9999 KW
Active Power (KWH) Range: 0-999999 KWH
Power Supply: 230V AC, 50 Hz, Approx 4VA
Frequency: 45 To 65 Hz
Wiring System: 3Ph-4W
Protection Level: IP-65 (Front side) as per IS/IEC 60529: 2001
Operating Temperature: 0°C To 50°C
Relative Humidity: Up to 95% RH Non Condensing
Current Range: 0.1 to 5A AC
Voltage Range (P-P): 50-500V AC
Voltage Range (P-N): 30-300V AC
Accuracy Class: 1.0
CT Selection: Up to 4000/5 Amp AC CAT III

Usage Features:

CT Primary Selection: The EM-10 allows users to configure the CT ratio. To enter CT ratio mode, press and hold the "RESET KWH" key while powering on the unit. The display will show "Ct rAt". Users can then adjust the CT ratio up to 4000/5 using the "RESET KWH" and "CT KW" keys. Pressing the "CT KW" key increases the ratio, while pressing the "RESET KWH" key decreases it. To save the changes, power off the unit and then power it back on.
Resetting kWh: The accumulated kWh reading can be reset. To do this, press and hold the "RESET KWH" key for 10 seconds. The display will show "r-5Et". Then, press the "CT KW" key, and the display will show "r5t don". After a brief wait, the kWh will be reset.
Safety Precautions: The manual emphasizes strict adherence to safety guidelines. It warns against handling the equipment in ways not specified by the manufacturer, which could impair protection. Users are advised to read the complete instructions before installation and operation. A "WARNING: Risk of electric shock" is prominently displayed.
Wiring Guidelines: To prevent electric shock, the power supply to the equipment must be OFF during wiring. Terminals should not be touched when power is supplied. For electromagnetic interference reduction, wires with adequate rating and twists of equal size should be used with the shortest possible connection. Cable for power source connection should have a cross-section of 1mm or greater and insulation capacity of at least 1.5kV. Using a standard power supply cable is recommended for better anti-noise effect.
Installation Guidelines: As a built-in type equipment, the terminals become inaccessible after installation. Metal pieces, wire clippings, or metallic fillings should be prevented from entering the product to avoid safety hazards. A circuit breaker or mains switch must be installed between the power source and supply terminal for ON/OFF function, and it should be conveniently accessible. The instrument should be used and stored within the specified ambient temperature and humidity ranges.
Mechanical Installation: The manual provides a detailed diagram for panel cutout dimensions (92mm x 92mm). The unit should be fitted into the panel using the provided clamp. It should not be installed near heating sources, caustic vapors, oil steam, or other unwanted process by-products. Crimp terminals (M3.5 screws) should be used for wiring the terminal block, tightened with a torque of 1.2 N.m. Unused terminals should not have anything connected to them.

Maintenance Features:

Regular Cleaning: The equipment should be cleaned regularly to prevent blockage of ventilating parts.
Cleaning Agent: Use a clean, soft cloth for cleaning. Isopropyl alcohol or any other cleaning agent should not be used.
Component Replacement: The fusible resistor must not be replaced by the operator.

The EM-10 is a robust and user-friendly energy meter, designed for reliable performance in demanding electrical environments, with clear instructions for safe installation, operation, and maintenance.