Overview

This document details technical specifications for TFC Series NEMA EPACT and Premium Efficiency 3-Phase Cast Iron Totally Enclosed Fan Cooled (TEFC) motors, covering horsepower ratings from 0.75 HP up to 200 HP and frame sizes ranging from 143T to 447T. It includes both Design B and Design C motor configurations, intended for general industrial applications such as pumps, fans, and compressors.

Applications

These motors are designed for reliable and efficient operation in various industrial machinery requiring 3-phase motors, emphasizing durability and environmental protection.

Features

• Robust cast iron construction for enhanced durability
• Totally Enclosed Fan Cooled (TEFC) enclosure to protect against contaminants
• Compliance with NEMA EPACT and Premium Efficiency standards
• Wide range of frame sizes and horsepower options

Mechanical Specifications

The document provides comprehensive mechanical data including overall and installation dimensions for foot mounting and C-face shaft configurations. Key parameters such as shaft diameters, bolt circle diameters, and mounting hole sizes are specified to ensure proper fit and alignment during installation.

Electrical Specifications and Performance Data

Detailed tables present electrical and performance characteristics for various motor sizes and speeds (3450, 1720, and 1150 rpm), including:

• Full load current at 460V and 575V
• Locked rotor current values
• Torque at full load and locked rotor conditions
• Efficiency percentages at full load
• Breakdown torque percentages
• Power factor (CosФ)
• Service factors
• Starting torque and current ratios (Tst/Tn, Tmin/Tn, Tmax/Tn)

Separate data sets for Design B and Design C motors highlight differences in efficiency and performance.

Efficiency and Compliance

Motors meet or exceed NEMA EPACT efficiency requirements. Premium Efficiency models offer superior performance, with efficiency ranging from approximately 74% for smaller motors to over 95% for larger units, depending on design and speed.

Installation and Safety Notes

Safety instructions emphasize isolating electrical circuits before motor installation or removal. Dimensional data supports accurate mounting and alignment to ensure safe and effective operation.

Critical Parameters and Recommendations

• Select motor frame size and horsepower based on application speed and load requirements.
• Verify electrical supply voltage and current ratings to match motor specifications.
• Consider service factors and torque requirements for starting and running conditions.
• Use provided mechanical dimensions for precise installation and compatibility with driven equipment.
• Opt for Premium Efficiency models to achieve energy savings and regulatory compliance.

Summary of Key Parameters

Critical Information and Best Practices

• Ensure motor selection aligns with required horsepower, speed, and frame size for the intended application.
• Account for locked rotor current and torque ratios to prevent electrical and mechanical stress during startup.
• Utilize service factor ratings to accommodate occasional overloads safely.
• Choose Premium Efficiency motors for enhanced energy savings and improved operational performance, especially for continuous industrial use.

Conclusion

This document serves as a comprehensive technical reference for engineers and technicians involved in specifying, selecting, and installing TFC Series NEMA EPACT and Premium Efficiency TEFC motors. It provides essential mechanical and electrical data to ensure optimal motor performance, compliance, and reliability across diverse industrial applications.