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NEMA Standards PublicationApplication Guide For AC Adjustable Speed Drive SystemsPublished byNational Electrical Manufacturers Associationth1300 N. 17 Street, Suite 1847Rosslyn, VA 22209 Copyright 2001 by the National Electrical Manufacturers Association. All rights including translation intoother languages, reserved under the Universal Copyright Convention, the Berne Convention for theProtection of Literary and Artistic Works, and the International and Pan American Copyright Conventions.
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TABLE OF CONTENTS1. SCOPE.12. REFERENCED STANDARDS .12.1 REFERENCED NEMA STANDARDS .12.1.1 MG1-1998 Motors and Generators . 12.1.2 ICS 7 -1993 Industrial Control and Systems Adjustable-Speed Drives. 12.1.3 ICS 7.1-1995 Safety Standards for Construction and Guide for Selection, Installation, and Operationof Adjustable Speed Drive Systems. 12.1.4 NEMA 250-1996 Enclosures for Electrical Equipment (1000 Volts Maximum) . 12.2 OTHER REFERENCED STANDARDS .23. DEFINITIONS.24. DESCRIPTION OF SYSTEM COMPONENTS .54.1 LOAD TYPES .54.1.1 Variable torque. 54.1.2 Constant Torque . 64.1.3 Constant horsepower . 84.2 MOTOR TYPES .94.2.1 General . 94.2.2 Design A. 94.2.3 Design B. 104.2.4 Design C . 104.2.5 Design D . 104.2.6 Definite-Purpose Inverter-Fed . 114.3 CONTROL TYPES .124.3.1 Typical Power Ratings . 124.3.2 Control Methods . 124.3.3 PWM Modulation Techniques . 135. DESCRIPTION OF COMPONENT INTERACTIONS .145.1 INTERACTION BETWEEN LOAD AND MOTOR .145.1.1 Service Factor. 145.1.2 Maximum safe operating speed. 145.1.3 Overspeed Capability . 145.1.4 Direction of Rotation . 165.2 INTERACTION BETWEEN MOTOR AND CONTROL.175.2.1 Thermal Considerations . 175.2.2 Power Factor Correction. 225.2.3 Speed range . 225.2.4 Acceleration Time. 235.2.5 Deceleration Time / Internal Motor Braking . 245.2.6 Reversal. 25
5.2.7 Stability. 255.2.8 Bypass . 255.2.9 Motor Terminal Voltage Transients . 265.2.10 Shaft Voltage and Bearing Currents. 325.2.11 Load Reactors and Filters . 375.2.12 Multiple Motors. 375.2.13 Pole Count . 385.2.14 Connecting High Voltage to the Low Voltage Connection of a Dual Voltage General-Purpose Motor385.3 INTERACTION BETWEEN CONTROL AND AC POWER LINE .395.3.1 Source Impedance/Short-circuit Ampere Interrupting Capacity (AIC) Ratings . 395.3.2 Line Variations . 405.3.3 AC Line Power Factor. 405.3.4 Line Harmonic Currents – Adjustable Frequency Control Created . 415.3.5 Control Protection . 425.4 DRIVE SYSTEM INTERACTIONS .445.4.1 Efficiency. 445.4.2 Sound, Vibration, Resonance. 445.4.3 Grounding . 455.4.4 Power Cable Selection . 465.4.5 Electromagnetic Compatibility (EMC) . 496. SELECTION OF MOTOR AND CONTROL BY APPLICATION .506.1 APPLICATION INFORMATION .506.2 MOTOR SELECTION .516.2.1 Determine Motor Enclosure Requirements. 516.2.2 Determine Motor Torque and Speed Requirements . 516.2.3 Determine Accelerating and Decelerating Requirements (Time and Load) . 526.2.4 Overload. 536.2.5 Determine Type of Duty. 536.2.6 Other Considerations. 546.3 CONTROL SELECTION.556.3.1 Control Type Considerations . 556.3.2 Control and Motor Voltage Considerations . 556.3.3 Control HP/Current Rating Considerations . 566.3.4 Control Enclosure Considerations. 566.3.5 Speed Range and Regulation Considerations.
NEMA standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards dev elopment process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process and establishes rules to promote fairness in the .
