MADCAD.com - The Cloud-Based Reference Library

Not a subscriber? Register for a trial account.

Username:
Password:

Incorrect username/password.

Already a subscriber?

MADCAD.com Free Trial

Sign up for a 3 day free trial to explore the MADCAD.com interface, PLUS access the
2009 International Building Code to see how it all works.

If you like to setup a quick demo, let us know at support@madcad.com
or +1 800.798.9296 and we will be happy to schedule a webinar for you.

Email *
Password *
Confirm *
First Name *
Last Name *
Title
Company Name *
Company Size *
Industry *
Address *
Address 2
City *
State *	Zip *
Country *
Phone *
How did you hear about MADCAD.com? *

⨯To continue with accurate pricing,
please select your company type below:

Large goverment organizations

Large multi-national corporation (more than $5B annual revenue)

None of the above

Your company has a special pricing case for IEEE.
For pricing, please contact us by filling out the form.

Full name*
Email*
Phone
Your selection

⨯We need your input!

Are you a code official in a jurisdiction with less than 300,000 population?

Yes No

This item is only available for the code officials of jurisdictions less then 300K population.

If you do not meet the criteria item will be removed and you will be able to continue shopping other items.

⨯ We need your input!

Your company has a special pricing case for ASME.
Please make sure the information you provide below is accurate.

Company Industry
Number Of Employees
Revenue

Pricing for the ASME publications in the store is for a 1-4 employee company in Construction Industry with revenue under $500,000.
If correct company info does not match what is publicly available info we will suspend the access and contact you for correction.
Please call 1-800-798-9296 if you have any questions.
If your company has more than 5,000 employee or more than 500 mil revenue please email us at info@madcad.com to receive a special quote, use "ASME Quote" on the subject line.

Search book title

Search book content

Clear all filters Advanced Search Basic Search

Download File

eLibrary > NEMA ICS 7.2-2021 Application Guide for AC Adjustable Speed Drive Systems >

NEMA ICS 7.2-2021 Application Guide for AC Adjustable Speed Drive Systems, 2021

Expand All

TOC Search:

NEMA ICS 7.2-2021 Application Guide for AC Adjustable Speed Drive Systems, 2021

National Electrical Manufacturers Association
Foreword
Contents [Go to Page]
Tables
Figures
Section 1 Scope
Section 2 Referenced Standards [Go to Page]
2.1 Referenced Standards [Go to Page]
2.1.1 NEMA MG 1 Motors and Generators
2.2 Other Referenced Standards
Section 3 Definitions [Go to Page]
Figure 3-1 Operating Loop Travel
Figure 3-2 Center Winder (Unwinder)
Figure 3-3 Surface Winder
Section 4 Description of System Components [Go to Page]
4.1 Load Types [Go to Page]
4
4.1
4.1.1 Variable Torque [Go to Page]
4.1.1.1 Squared Torque Variation [Go to Page]
Figure 4-1 Squared Torque Variation
4.1.1.2 Linear Torque Variation [Go to Page]
Figure 4-2 Linear Torque Variation
4.1.2 Constant Torque [Go to Page]
Figure 4-3 Constant Torque Load
4.1.2.1 Duty Cycle [Go to Page]
Figure 4-4 Duty Cycles
4.1.2.2 High-Impact Load [Go to Page]
Figure 4-5 Impact Load
4.1.3 Constant Horsepower [Go to Page]
Figure 4-6 Constant Horsepower Load
4.2 Motor Types [Go to Page]
4.2.1 General
4.2.2 Design A [Go to Page]
Figure 4-7 Typical Motor Speed Torque Curves
4.2.3 Design B
4.2.4 Design C
4.2.5 Design D
4.2.6 Definite-Purpose Inverter-Fed [Go to Page]
Figure 4-8 Basis of Rating
4.2.6.1 Variable Speed Duty
4.2.6.2 Continuous Duty
4.2.7 Permanent Magnet Synchronous Motors
4.2.8 Synchronous Reluctance Motors
4.3 Control Types [Go to Page]
4.3.1 Typical Power Ratings [Go to Page]
4.3.1.1 General
4.3.1.2 Variable Torque
4.3.1.3 Constant Torque
4.3.2 Control Methods [Go to Page]
4.3.2.1 Volts per Hertz
4.3.2.2 Vector Control
4.3.2.2.1 General
4.3.2.2.2 Direct
4.3.2.2.3 Indirect
4.3.3 PWM Techniques [Go to Page]
4.3.3.1 Sine-Triangular Modulation
4.3.3.2 Space Vector Modulation (SVM)
Section 5 Description of Component Interactions [Go to Page]
5.1 Interaction Between Load and Motor [Go to Page]
5.1.1 Service Factor
5.1.2 Maximum Safe Operating Speed
5.1.3 Overspeed Capability [Go to Page]
5.1.3.1 General-Purpose Motor [Go to Page]
Table 5-1 Maximum Safe Operating Speed for Standard Design A and B Direct Drive (Ts Shaft for Motors Above the 250 Frame) Squirrel-Cage Induction Motors
Table 5-2 Overspeed Capability of General-Purpose Motors
5.1.3.2 Definite-Purpose, Inverter-Fed Motors [Go to Page]
Table 5-3 Overspeed Capability of Definite-Purpose Inverter-Fed Motors
5.1.4 Direction of Rotation [Go to Page]
5.1.4.1 General-Purpose Polyphase Induction Motors [Go to Page]
WARNING—DIRECTION OF ROTATION SHOULD BE CHECKED BY MOMENTARY APPLICATION OF VOLTAGE BEFORE CONNECTING THE MOTOR TO THE DRIVEN EQUIPMENT.
5.1.4.2 Definite-Purpose Inverter-Fed Polyphase Induction Motors
5.1.4.2.1 F1 or F2 Arrangement, Foot Mounted [Go to Page]
WARNING—DIRECTION OF ROTATION SHOULD BE CHECKED BY MOMENTARY APPLICATION OF VOLTAGE BEFORE CONNECTING THE MOTOR TO THE DRIVEN EQUIPMENT.
5.1.4.2.2 Other Arrangements [Go to Page]
WARNING—DIRECTION OF ROTATION SHOULD BE CHECKED BY MOMENTARY APPLICATION OF VOLTAGE BEFORE CONNECTING THE MOTOR TO THE DRIVEN EQUIPMENT.
5.1.4.3 Phase Sequence of the Adjustable Frequency Control
5.2 Interaction Between Motor and Control [Go to Page]
5.2.1 Thermal Considerations [Go to Page]
5.2.1.1 Inverter Losses
5.2.1.2 Non-Fundamental Currents
5.2.1.3 Reduced Speed
5.2.1.4 Voltage Boost
5.2.1.5 Motor Thermal Protection [Go to Page]
CAUTION—BECAUSE THESE PROTECTORS ARE CURRENT SENSITIVE AND MAY BE SENSITIVE TO AIRFLOW, EXTREME CAUTION SHOULD BE USED IN APPLYING A MOTOR WITH THIS TYPE OF PROTECTION ON A CONTROL. UNDERWRITERS LABORATORIES (UL) RECOGNIZED PROTECTOR/MOTOR COMBINATION...
CAUTION—CONNECTING THE PILOT DEVICES INTO THE CONTROL LOGIC CIRCUIT IS MANDATORY IN HAZARDOUS LOCATION APPLICATIONS. IN THESE APPLICATIONS, THE AGENCY LISTING MAY HAVE BEEN OBTAINED ASSUMING THE PILOT PROTECTORS WILL CAUSE THE MOTOR TO BE DISCONNECTED...
5.2.1.6 Voltage
5.2.1.7 Allowable Temperature Rise
5.2.1.7.1 General-Purpose Motors—Designs A, B, C, and D [Go to Page]
Table 5-4 Temperature Rise for General-Purpose Motors—Designs A, B, C, and D
5.2.1.7.2 Definite-Purpose Inverter-Fed Motors
5.2.1.7.2.1 Maximum Temperature Rise for Continuous Duty-Rated Motors [Go to Page]
Table 5-5 Temperature Rise for Continuous Duty Definite-Purpose Inverter-Fed Motors
5.2.1.7.2.2 Maximum Temperature Rise for Variable Speed Duty-Rated Motors [Go to Page]
Table 5-6 Temperature Rise for Definite-Purpose Inverter-Fed Motors
5.2.1.7.2.3 Relative Equivalent Temperature Rise for Variable Speed Duty [Go to Page]
Figure 5-1 Load Cycle Based on Temperature and Time of Operation
5.2.1.7.3 Temperature Rise for Ambients Higher than 40 C
5.2.1.7.4 Temperature Rise at Altitudes Above 3,300 Feet (1,000 Meters)
5.2.1.7.4.1 Ambient Temperature at Altitudes for Rated Temperature Rise
5.2.1.7.4.2 Temperature Rise at Sea Level
5.2.1.7.4.3 Preferred Values of Altitude for Rating Motors
5.2.2 Power Factor Correction and Surge Protection
5.2.3 Speed Range
5.2.4 Acceleration Time [Go to Page]
Figure 5-2 Constant Horsepower Load
5.2.5 Deceleration Time/Internal Motor Braking [Go to Page]
5.2.5.1 DC Injection Braking
5.2.6 Reversal [Go to Page]
5.2.6.1 Bypass Considerations
5.2.6.2 Direction-Sensitive Motors and Loads
5.2.7 Stability
5.2.8 Bypass
5.2.9 Motor Terminal Voltage Transients [Go to Page]
5.2.9.1 Peak Repetitive Voltage Rating
5.2.9.1.1 General-Purpose Motors
5.2.9.1.2 Definite-Purpose Inverter Fed Motors [Go to Page]
Figure 5-3 Typical Voltage Response at Motor Terminals
5.2.9.2 Fundamental Contributors to Peak Voltages
5.2.9.2.1 Pulse Rise Time
5.2.9.2.2 Cable Length
5.2.9.2.3 Minimum Time Between Pulses and Minimum Pulse Duration
5.2.9.2.4 Transition Type
5.2.9.2.5 Multiple Motors
5.2.9.3 Switching Frequency
5.2.9.4 Description of Installation Categories
5.2.9.4.2 Category I
5.2.9.4.3 Category II
Figure 5-4 Peak Voltage Categories When Using 65 ns Rise Time Pulse
Figure 5-5 Peak Voltage Categories When Using 160 ns Rise Time Pulse
5.2.9.6 Peak Voltage Test Results
Table 5-8 Characteristics of the Three Controls
Figure 5-6 Test Results of Peak Motor Voltage Based upon Lead Length for a 5 HP Motor
Figure 5-7 Test Results of Peak Motor Voltage Based upon Switching Frequency for a 5 HP Motor (Lead Length of 100 Feet)
5.2.10 Shaft Voltage and Bearing Currents [Go to Page]
CAUTION—OTHER NON-INSULATED BEARINGS CONNECTED TO THE SHAFT WITH A CONDUCTIVE COUPLING (SUCH AS TACHOMETERS OR GEARBOXES) MAY BE DAMAGED BY THE SHAFT VOLTAGE.
5.2.10.2 Examples of Bearing Current Damage
Figure 5-8 Fluted Bearing Damage Caused by Electrical Current Flow
Figure 5-9 Electrical Arc Pit Located on the Inner Raceway of Bearing
5.2.10.3 Sources of Bearing Current
5.2.10.4 Common Mode Voltages
5.2.10.5 Shaft Voltage and Bearing Current
Figure 5-10 Electric Machine Showing Parasitic Couplings
Figure 5-11 Common Mode Basic Circuit
Figure 5-12 Shaft Voltage Without Bearing Current 10V/DIV 25S/DIV
Figure 5-13 Shaft Voltage Top 25V/DIV 5S/DIV and Bearing Current Bottom 500mA/DIV 5S/DIV
5.2.11 Load Reactors and Filters
5.2.12 Multiple Motors [Go to Page]
5.2.12.2 Protection
5.2.12.3 Peak Voltages
5.2.13 Pole Count
5.2.14 Connecting High Voltage to the Low Voltage Connection of a Dual Voltage General-Purpose Motor
5.3 Interaction Between Control and AC Power Line [Go to Page]
5.3.1 Source Impedance/Short-Circuit Ampere Interrupting Capacity (AIC) Ratings [Go to Page]
Table 5-9 Minimum AIC Ratings
5.3.2 Line Variations [Go to Page]
5.3.2.2 Voltage Unbalance
5.3.2.3 Single-Phase Input for Three-Phase Drives
5.3.2.4 Frequency
5.3.3 AC Line Power Factor [Go to Page]
5.3.3.2 Power Factor Correction/Precautions
5.3.4 Line Harmonic Currents—Adjustable Frequency Control Created
5.3.5 Control Protection [Go to Page]
5.3.5.2 Short-Circuit Protection
5.3.5.3 Transient Voltage Protection
5.3.5.4 Overvoltage Protection
5.3.5.5 Undervoltage Protection
5.3.5.6 Single-Phase Input Protection
5.3.5.7 Ground-Fault Protection
5.4 Drive System Interactions [Go to Page]
5.4.1 Efficiency
5.4.2 Sound, Vibration, Resonance [Go to Page]
5.4.2.1 General
5.4.2.2 Sound and Vibration
5.4.2.3 Torsional Considerations
5.4.3 Grounding [Go to Page]
5.4.3.2 Grounding of Motor
5.4.3.3 Bonding of Motor
5.4.4 Power Cable Selection [Go to Page]
5.4.4.2 Differential Mode Considerations
5.4.4.2.1 Partial Discharge Inception Voltage (PDIV)
Table 5-10 60 Hz Sinewave Dielectric Test Voltage Specified in UL 1569 600 V Type MC Cable vs. Corona Inception Voltage Test Results at 25 C
5.4.4.3 Common Mode Considerations
5.4.4.3.1 Common Mode Considerations Background
Figure 5-14 Types of Drive Power Cables
5.4.5 Electromagnetic Compatibility (EMC)
Section 6 Selection of Motor and Control by Application [Go to Page]
6.1 Application Information
6.2 Motor Selection [Go to Page]
6.2.1 Determine Motor Enclosure Requirements [Go to Page]
6.2.1.1 Hazardous Locations
6.2.2 Determine Motor Torque and Speed Requirements [Go to Page]
6.2.2.1 Operating Speed Range [Go to Page]
Table 6-1 Constant and Variable Torque Speed Range Examples (Base Speed = 2,500 rpm)
Table 6-2 Constant Horsepower Speed Range Examples (Base Speed = 2,500 rpm)
6.2.2.2 Breakaway Torque
6.2.3 Determine Accelerating and Decelerating Requirements (Time and Load)
6.2.4 Overload Capability
6.2.5 Determine Type of Duty [Go to Page]
6.2.5.1 Continuous Process
6.2.5.2 Duty Cycles
6.2.6 Other Considerations [Go to Page]
6.2.6.1 Bypass (Across-the-Line Starting)
6.2.6.2 Operating Frequency
6.2.6.3 Efficiency
6.3 Control Selection [Go to Page]
6.3.1 Control Type Considerations [Go to Page]
Table 6-3 Control Performance Considerations
6.3.2 Control and Motor Voltage Considerations [Go to Page]
6.3.2.1 Control Input Voltage
6.3.2.2 Motor Voltage
6.3.3 Control HP/Current Rating Considerations [Go to Page]
6
6.3.1
6.3.2
6.3.3
6.3.3.1 Short-Time Overcurrent Rating
6.3.4 Control Enclosure Considerations [Go to Page]
6.3.4.1 Environmental Considerations
6.3.4.2 Ambient Temperature
6.3.4.3 Altitude
6.3.4.4 Humidity
6.3.4.5 Outdoor Mounting
6.3.4.6 Vibration Conditions
6.3.5 Speed Range and Regulation Considerations [Go to Page]
6.3.5.1 Speed Range
6.3.5.2 Speed Regulation
6.3.6 Bypass Operation Considerations
6.3.7 Acceleration Time Considerations
6.3.8 Deceleration and Braking
6.3.9 Line Harmonic Voltage and Current Considerations
6.4 Variable Torque Application [Go to Page]
6.4.1 Motor Selection [Go to Page]
6.4.1.1 Operating Speed Range
6.4.1.2 Determine Accelerating and Decelerating Requirements (Time and Load)
6.4.1.3 Overload
6.4.1.4 Bypass
6.4.2 Control Selection [Go to Page]
6.4.2
6.4.3
6.4.2.1 Control Type
6.4.2.2 Speed Range
6.4.2.3 Bypass
6.5 Constant Torque Application [Go to Page]
6.5.1 Motor Selection [Go to Page]
6.5.1.1 Operating Speed Range
6.5.1.2 Breakaway Torque
6.5.1.3 Determine Accelerating and Decelerating Requirements (Time and Load)
6.5.1.4 Overload
6.5.1.5 Duty Cycles
6.5.1.5.1 General
6.5.1.5.2 High Impact
6.5.2 Control Selection [Go to Page]
6.5.2.1 Control Type
6.5.2.2 Control HP/Current Sizing Considerations
6.5.2.3 Duty Cycle
6.5.2.3.1 General
6.5.2.3.2 High Impact
6.5.2.4 Speed Range and Regulation Considerations
6.6 Constant Horsepower Application [Go to Page]
6.6.1 Motor Selection [Go to Page]
6.6.1.1 Determine Motor Torque and Speed Requirements [Go to Page]
Figure 6-1 A Motor Design Where the Voltage and Torque Corner Points Are the Same
Figure 6-2 A Motor Design Where the Torque Corner Point Is at a Lower rpm than the Voltage Corner Point; Base Speed Is at the Torque Corner Point
6.6.1.2 Operating Speed Range
6.6.1.3 Overload
6.6.2 Control Selection [Go to Page]
6.6.2.1 Control Types
6.6.2.2 Control HP/Current Sizing Considerations
6.6.2.3 Speed Regulation Considerations
6.7 Loop Position and Tension Control Systems [Go to Page]
6.7.1 General
6.7.2 Characteristics and Ratings [Go to Page]
6.7.2.1 Torque Control Systems (with Motor Armature Current Feedback)
6.7.2.1.1 Torque Control Operation [Go to Page]
Table 6-4 Torque Control Operating Variables and Deviation Bands
Figure 6-3 Torque Control Systems
6.7.2.2 Constant Force Loop Position Control Systems
6.7.2.2.1 Constant Force Operation [Go to Page]
Table 6-5 Constant-Force Loop Position Operating Variables and Deviation Band
Figure 6-4 Constant Force Loaded Loop—Position Control System
6.7.2.3 Hanging and Storage Loop Position Control
6.7.2.3.1 Hanging and Storage Loop Position Operation [Go to Page]
Table 6-6 Loop Operation Operating Variables and Deviation Bands
Figure 6-5 Hanging and Storage Loop Control System
6.7.2.4 Tension Feedback Control System
6.7.2.4.1 Description of Tension Operation [Go to Page]
Table 6-7 Tension Control Operating Variables and Deviation Bands
Figure 6-6 Tension Feedback Control System
6.7.3 Application
6.8 Wind and Unwind Drive Systems [Go to Page]
6.8.1 General
6.8.2 Application [Go to Page]
Table 6-8 Table Format for Line Speed and Tension Data
Section 7 Measurements/Instrumentation [Go to Page]
7.1 General [Go to Page]
WARNING—THE MEASUREMENT OF ELECTRICAL QUANTITIES OF EQUIPMENT DESCRIBED IN THIS GUIDE INVOLVES POTENTIALLY LETHAL VOLTAGE AND CURRENT LEVELS. CARE MUST BE TAKEN WHEN OBTAINING MEASUREMENTS. ONLY QUALIFIED INDIVIDUALS, FAMILIAR WITH THE CONSTRUCTION AN...
7.2 Parameter Measurements [Go to Page]
Table 7-1 Recommended Instrumentation for Parameter Measurement
Section 8 Sample ASD Application Data Form [Go to Page]
8.1 Application
8.2 Motor
8.3 Control
8.4 Motor Environment
8.5 Control Environment
8.6 Connection
8.7 Other
Annex A [Go to Page]
30.2.1.12 Overload Capability (Motor)
30.2.2.2 Torque
Annex B [Go to Page]
31.3.1 Basis of Rating [Go to Page]

MADCAD.com Free Trial

Report To Us

Contact us for a custom quote

⨯To continue with accurate pricing,
please select your company type below:

⨯We need your input!

⨯ We need your input!

⨯We need your input!

⨯We need your input!

Cart Warning

NEMA ICS 7.2-2021 Application Guide for AC Adjustable Speed Drive Systems, 2021

MADCAD.com Free Trial

Report To Us

Contact us for a custom quote

⨯To continue with accurate pricing, please select your company type below:

⨯We need your input!

⨯ We need your input!

⨯We need your input!

⨯We need your input!

Cart Warning

NEMA ICS 7.2-2021 Application Guide for AC Adjustable Speed Drive Systems, 2021

⨯To continue with accurate pricing,
please select your company type below: