Eaton PX8051A5BA

PX8051A5BA is an AC power meter from Eaton’s PX 8000 series, equipped with a communication module (Com. Exp.) and I/O expansion card. It is specifically designed for high-precision electrical energy monitoring and remote data acquisition. The meter is suitable for industrial and commercial power distribution systems that require real-time electrical parameters such as power, energy consumption, and power factor.

Main Technical Specifications (Excerpted from Product List)

• Model: PX8051A5BA
• Series: PX 8000 (AC Meter)
• Function: Power meter with communication module (Com. Exp.) and I/O expansion card
• Voltage Range: Suitable for power distribution networks below 3 kV (refer to the product manual for specific voltage levels)
• Measurement Accuracy: Class 0.2% (power) and 0.5% (energy consumption) compliant with IEC 62053-21/22 standards
• Communication Interfaces: Modbus RTU, Ethernet TCP/IP (optional)
• I/O Ports: Digital input/output, supporting connection of external relays and alarm signals
• Display: Local LCD showing key parameters including voltage, current, power, energy consumption, and power factor
• Power Supply: Internal power supply supporting 120 V/240 V AC input

Product Features

• High-Precision Measurement: Adopts Eaton’s self-developed high-precision current transformers and voltage shunts to meet industrial-level metering requirements.
• Modular Design: Enables function expansion through optional communication cards and I/O cards, facilitating flexible configuration for different on-site needs.
• Powerful Communication Capabilities: Supports mainstream industrial protocols such as Modbus and Ethernet, enabling easy integration with SCADA, DCS, or cloud platforms for remote monitoring and data analysis.
• Local Display and Alarm: The LCD displays key electrical parameters in real time, and digital I/O can directly drive local alarm lights or relays for quick on-site fault location.
• Durability: Complies with IEC 60529 IP20 protection class, suitable for harsh industrial environments inside cabinets or distribution boxes.

Structure and Composition

• Main Unit Housing: Metal casing integrating voltage/current sampling modules, processor, memory, and display unit internally.
• Communication Card (Com. Exp.): Plug-in slot providing interfaces such as Modbus/Ethernet.
• I/O Expansion Card: Offers digital input/output channels for direct connection to external relays, alarm lights, or switching signals.
• Power Supply Module: Internal rectification and voltage stabilization circuits ensure stable operation of the meter under 120 V/240 V AC power supply.
• Mounting Bracket: Standard DIN rail or panel mounting accessories for easy fixation inside distribution cabinets.

Typical Application Fields

• Industrial Power Distribution Monitoring: Energy consumption statistics and power factor management for high-power loads in large manufacturing plants, metallurgy, and chemical industries.
• Commercial Building Energy Management: Electrical energy metering and cost allocation in office buildings, shopping malls, and hotels.
• Public Facilities: Locations with strict requirements for power quality such as airports, railway stations, and hospitals.
• Renewable Energy Integration: Power monitoring and inverter control at photovoltaic and wind power grid connection points.
• Data Centers: Accurate measurement of IT load power to optimize PUE (Power Usage Effectiveness).

Installation Guidelines

• Location Selection: Install inside distribution cabinets or dedicated racks to ensure ventilation and heat dissipation.
• Wiring: Connect voltage transformers (VT) and current transformers (CT) in accordance with IEC 61850/62053 standards, and verify phase sequence.
• Communication Wiring: For Ethernet, use shielded twisted pair (Cat5e/6) with proper grounding; for Modbus RTU, use RS-485 bus with terminal resistors.
• Power Supply Connection: Confirm that the supply voltage matches the meter’s rated power supply, and use dedicated terminals to prevent loosening.
• Calibration: Perform on-site calibration after initial power-on to ensure consistency between CT/VT ratio coefficients and internal meter settings.

Maintenance Recommendations

• Regular Inspection: Check for loose wiring terminals and CT/VT fixing screws every 6 months, and clean dust.
• Firmware Upgrade: Access the Eaton Web Portal via Ethernet to check and update meter firmware for the latest features and security patches.
• Self-Test Function: Use the meter’s built-in Self-Test function to regularly verify the integrity of measurement channels.
• Spare Parts Management: Keep spare communication cards, I/O cards, and power supply modules on hand for quick replacement of faulty components.
• Record Keeping: Save installation and commissioning reports, calibration certificates, and maintenance logs to meet audit and energy consumption analysis requirements.

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