NEMA_ICS_1_Industrial_Control_and_Systems_General_Requirements.docx

Setting Standards for Excellence To: Current Holders ofICS 1-2000 From: NEMA Communications Department Date: June 23, 2005 Subject: Reaffirmation ofICS 1-2000

The NEMA Codes and Standards Committee has reaffirmed ICS 1-2000, General Standardsfor Industrial Control & Systems.

The new designator for this standard is ICS 1-2000 (R2005), General Standardsfor Industrial Control & Systems.

Please insert the attached revised title page into your standard.

Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMA No reproduction or networking permitted without license from IHS

Licensee=USCG/9961383100 Not for Resale, 03/06/2008 12:56:35 MST

NEMA ICS 1

INDUSTRIAL CONTROL AND SYSTEMS GENERAL REQUIREMENTS

NEMA Standards Publication ICS 1-2000 (R2005)

General Standards for Industrial Control & Systems

Published by:

National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847 Rosslyn, VA 22209

© Copyright by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions.

NOTICE AND DISCLAIMER

The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document.

The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development 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 development of consensus, it does not write the document and it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications.

NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, express or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturer or seller's products or services by virtue of this standard or guide.

In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication.

NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safety-related information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement.

General Requirements ICS 1-2000 Page i

Contents

Licensee=USCG/99613831 OD

ICS 1-2000

Page ii

General Requirements

General Requirements ICS 1-2000 Page iii

Page iv

Foreword

This standards publication was prepared by a technical committee of the NEMA Industrial Automation Control Products and Systems Section. It was approved in accordance with the bylaws of NEMA and supersedes the indicated NEMA Standards Publication. This standards publication supersedes ICS 1- 1993.

This standards publication provides practical information concerning ratings, construction, test, performance and manufacture of industrial control equipment. These standards are used by the electrical industry to provide guidelines for the manufacture and proper application of reliable products and equipment and to promote the benefits of repetitive manufacturing and widespread product availability.

NEMA standards represent the result of many years of research, investigation, and experience by the members of NEMA, its predecessors, its sections and committees. They have been developed through continuing consultation among manufacturers, users and national engineering societies and have resulted in improved serviceability of electrical products with economies to manufacturers and users.

One of the primary purposes of this standards publication is to encourage the production of reliable control equipment which, in itself, functions in accordance with these accepted standards. Some portions of these standards, such as electrical spacings and interrupting ratings, have a direct bearing on safety; almost all of the items in this publication, when applied properly, contribute to safety in one way or another.

Properly constructed industrial control equipment is, however, only one factor in m1rnm1zing the hazards, which may be associated with the use of electricity. The reduction of hazard involves the joint efforts of the various equipment manufacturers, the system designer, the installer and the user. Information is provided herein to assist users and others in the proper selection of control equipment.

The industrial control manufacturer has limited or no control over the following factors, which are vital to a safe installation:

a. Environmental conditions

b. System design

c. Equipment selection and application

d. Installation

e. Operating practices

f. Maintenance

This publication is not intended to instruct the user of control equipment with regard to these factors except insofar as suitable equipment to meet needs can be recognized in this publication and some application guidance is given.

This standards publication is necessarily confined to defining the construction requirements for industrial control equipment and to providing recommendations for proper selection for use under normal or certain specific conditions. Since any piece of industrial control equipment can be installed, operated and maintained in such a manner that hazardous conditions may result, conformance with this publication does not by itself assure a safe installation. When, however, equipment conforming

General Requirements ICS 1-2000 Page v with these standards is properly selected and is installed in accordance with the National Electrical Code and properly maintained, the hazards to persons and property will be reduced.

To continue to serve the best interests of users of Industrial Control and Systems equipment, the Industrial Control and Systems Section is actively cooperating with other standardization organizations in the development of simple and more universal metrology practices. In this publication, the U.S. customary units are gradually being supplemented by those of the modernized metric system known as the International Systems of Units (SI). This transition involves no changes in standard dimensions, tolerances, or performance specifications.

NEMA standards publications are subject to periodic review. They are revised frequently to reflect user input and to meet changing conditions and technical progress.

Proposed revisions to this standards publication should be submitted to: Vice President, Engineering Department National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847 Rosslyn, VA 22209

This standards publication was developed by the Industrial Automation Control Products and Systems Section. Section approval of the standard does not necessarily imply that all section members voted for its approval or participated in its development. At the time it was approved, the Industrial Automation Control Products and Systems Section consisted of the following members:

ABB Control, Inc. - Wichita Falls, TX Alstom Drives and Controls, Inc. - Pittsburgh, PA Automatic Switch Company - Florham Park, NJ Balluff, Inc. - Florence, KY Carlo Gavazzi, Inc. - Buffalo Grove, IL CMC Torque Systems - Billerica, MA Control Concepts Corporation - Beaver, PA Cooper Bussman - St. Louis, MO Cummins, Inc. - Minneapolis, MN Cyberex - Mentor, OH Eaton Corporation - Milwaukee, WI Echelon Corporation - Palo Alto, CA Electro Switch Corporation - Weymouth, MA Elliott Control Company - Hollister, CA Entrelec, Inc. - Irving, TX Firetrol, Inc. - Cary, NC Fisher-Rosemount Systems, Inc. - Austin, TX GE Fanuc Automation - Charlottesville, VA GE Industrial Systems - Plainville, CT Hubbell Incorporated - Madison, OH Joslyn Clark Controls, Inc. - Lancaster, SC Lexington Switch & Controls - Madison, OH MagneTek Inc. - New Berlin, WI Master Control Systems, Inc. - Lake Bluff, IL Metron, Inc. - Denver, CO

Page vi

Mitsubishi Electric Automation, Inc. - Vernon Hills, IL Moeller Electric Corporation - Franklin, MA Omron Electronics, LLC - Schaumburg, IL Peerless-Winsmith, Inc. - Warren, ·oH Pepper! + Fuchs, Inc. - Twinsburg, OH Phoenix Contact, Inc. - Harrisburg, PA Pittman, a Div. of Penn Engineering & Manufacturing Corporation - Harleysville, PA Post Glover Resistors, Inc. - Erlanger, KY RENCO Encoders - Goleta, CA Regal-Beloit Corporation - Bradenton, FL Reliance Controls Corporation - Racine, WI Robert Bosch Corporation - Avon, CT Rockwell Automation - Milwaukee, WI R Stahl, Inc. - Salem, NH Russelectric, Inc. - Hingham, MA Schneider Automation, Inc. - North Andover, MA SEW-Eurodrive, Inc. - Lyman, SC Siemens Energy & Automation - Alpharetta, GA Square D - Lexington, KY Texas Instruments, Inc. - Attleboro, MA Toma Tech., Inc. - St. Laurent, Quebec, Canada Toshiba International Corporation - Houston, TX Total Control Products Inc. - Milford, OH Turck, Inc. - Plymouth, MN Tyco Electronics/AMP - Harrisburg, PA WAGO Corp. - Germantown, WI Weidmuller, Inc. - Richmond, VA Yaskawa Electric America - Waukegan, IL

DISCLAIMER

The standards or guidelines presented in a NEMA standards publication are considered technically sound at the time they are approved for publication. They are not a substitute for a product seller's or user's own judgment with respect to the particular product referenced in the standard or guideline, and NEMA does not undertake to guarantee the performance of any individual manufacturer's products by virtue of this standard or guide. Thus, NEMA expressly disclaims any responsibility for damages arising from the use, application, or reliance by others on the information contained in these standards or guidelines.

General Requirements ICS 1-2000 Page vii

INTRODUCTION

The standards pertaining to general requirements in NEMA Standards Publication ICS 1 are subdivided into the following clauses:

1 General Referenced Standards Scope Normative References

2 Definitions Terms which supplement the IEC International Electrical Vocabulary (IEV 441) or assist in clarifying the product standard.

3 Classification Product classifications where they have been established.

4 Characteristics and Ratings Descriptions of the kinds of ratings applicable to the product and tables of standard ratings for the product where they have been established.

5 Product Marking, Installation and Maintenance Information Product information to be provided to assist the user in the installation, use and maintenance of the devices.

6 Service and Storage Conditions A description of service and storage conditions for which the devices are intended.

7 Construction Marking, color coding and similar production requirements to be incorporated into the product as manufactured, as well as production test requirements where they have been established, i.e., the rules that the manufacturer follows in producing the product.

8 Performance Requirements and Tests The performance required to pass each design test specified for the product.

This standards publication contains general requirements that are applicable to the majority of products with the scope of the Industrial Automation Control Products and Systems Section. The product standards that make reference to these general requirements include:

NEMA Standards Title Publication No.

ICS 1 Industrial Control and Systems - General Requirements

ICS 2 Industrial Control and Systems - Controllers, Contactors, and Overload Relays, Rated Not More Than 2000 Volts AC or 750 Volts DC

ICS 3 Industrial Control and Systems - Factory-built Assemblies ICS 4 Industrial Control and Systems - Terminal Blocks ICS 5 Industrial Control and Systems - Control Circuit and Pilot Devices

Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMA Licensee=USCG/9961383100

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General Requirements ICS 1-2000

Industrial Control and Systems General Requirements

1 General

1.1 Referenced standards

The following standards contain provision which, through reference in this text, constitute provisions of this NEMA Standard Publication. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

American National Standards Institute 11 West 42nd Street New York, NY 10036

C84. 1-1995 Voltage Ratings for Electric Power Systems and Equipment (60 Hz)

2535.4-1998 Standard for Product Safety Labels

American Society for Testing and Materials 1916 Race Street Philadelphia, PA 19103

0-3638-1993 Test Methods for Comparative Tracking Index of Electrical Insulating Materials

Institute of Electrical and Electronics Engineers 345 East 47th Street New York. NY 10017

IEEE 100-2000 Standard Dictionary of Electrical and Electronics Terms (ANSI C42-100)

International Electrotechnical Commission 1, Rue de Varembe Geneva, Switzerland

IEC 112-1979 Methods for Determining the Comparative and the Tracking Indices of Solid Insulating Materials Under Moist Conditions

IEC 664-1-1992 Insulation Coordination for Equipment Within Low-Voltage Systems, Part 1: Principles, Requirements and Tests

National Fire Protection Association 1 Batterymarch Park Quincy, MA 02269 ANSl/NFPA 70-1999 National Electrical Code ANSl/NFPA 70E-2000 Electrical Safety Requirements for Employee Workplaces

Underwriters Laboratories Inc.

333 Pfingsten Rd.

Northbrook, IL 60062 UL 508 - 1999 Industrial Control Equipment (17th Ed) 1.2 Scope The scope of this publication is the scope of the Industrial Automation Control Products and Systems Section. The purpose of this publication is to consolidate all standards of a general nature in order to obtain uniform application of requirements throughout the range of industrial control and systems equipment.

1.3 Relation to Product Standards

The requirements in this publication shall apply to all other NEMA Standards Publications for industrial control and systems equipment unless otherwise specified.

For each type of product, only two main documents are normally necessary to determine all requirements:

a. This general standard, referred to as ICS 1

b. The specific standard applying to the type of product, hereafter referred to as the "relevant product standard" or "product standard."

General Requirements ICS 1-2000

2 Definitions ( * indicates definition from ANSI/IEEE Standard 100.)

For the purposes of this publication the following definitions apply:

The terms have been arranged in an alphabetical order that reflects common usage. Specialized definitions applying to specific products appear in the standards publications for those products.

accelerating contactor: A contactor, other than the line or directional contactor, used primarily for the purpose of obtaining a change of accelerating torque.

adaptive control systems*: A control system within which automatic means are used to change the system parameters in a way intended to improve the performance of the control system.

alternating current (AC) contactor: A contactor for the specific purpose of establishing and interrupting an AC power circuit.

ambient temperature*: The temperature of the medium such as air, water, or earth into which the heat of the equipment is dissipated.

NOTES

a. For self-ventilated equipment, the ambient temperature is the averaget temperature of the air in the immediate vicinity of the equipment.

b. For air- or gas-cooled equipment with forced ventilation or secondary water cooling, the ambient temperature is taken as that of the ingoing air or cooling gas.

c. For self-ventilated enclosed (including oil-immersed) equipment considered as a complete unit, the ambient temperature is the average t temperature of the air outside of the enclosure in the immediate vicinity of the equipment.

(These notes are not a part of ANSI/IEEE Std 100 definition.) tThe average of temperature readings at several locations.

apparatus: Includes the enclosure, the enclosed equipment, and attached appurtenances.

application test: A test performed by a manufacturer to determine those operating characteristics that are not necessarily established by standards but that are of interest in the application of devices.

automatic reset*: A function that operates to automatically re-establish specific conditions.

auxiliary contacts (switching device)*: Contacts in addition to the main-circuit contacts that function with the movement of the latter.

barrier*: A partition for the insulation or isolation of electric circuits or electric arcs.

block diagram: A diagram made up of a group of interconnected blocks, each of which represents a device or subsystem.

break rating: The value of current for which a contact assembly is rated for opening a circuit repeatedly at a specified voltage and under specified operating conditions.

bus:

a. A set of power supply leads

b. A conductor that provides multiple connections carryover period: The maximum time of power loss during which a system will remain within specified limits of performance.

clearance: The shortest distance through air between conducting parts, or between a conducting part and the outer surface of the insulating enclosure considered as though metal foil were in contact with the accessible surfaces of the enclosure.

A joint between two parts of an insulating barrier is considered to be part of the surface except where the interstices are completely filled with an insulating material (cement).

combination controller (600 volts or less)*: A full magnetic or semi-magnetic controller with additional externally operable disconnecting means contained in a common enclosure. The disconnecting means shall be permitted to be a circuit breaker or a disconnect switch. Combination starters are specific forms of combination controllers.

conducting parts*; live parts: Those parts that are designed to carry current or that are conductively connected therewith.

connection diagram: See wiring diagram.

construction diagram*: A diagram that shows the physical arrangement of parts, such as wiring, buses, resistor units, etc.

Example: A diagram showing the arrangement of grids and terminals in a grid-type resistor.

contactor: A two-state (ON-OFF) device for repeatedly establishing and interrupting an electric power circuit. Interruption is obtained by introducing a gap or a very large impedance.

contacts*: Conducting parts that co-act to complete or to interrupt a circuit.

continuous periodic rating*: The load that can be carried for the alternate periods of load and rest specified in the rating and repeated continuously without exceeding the specified limitation.

continuous rating*: The maximum constant load that can be carried continuously without exceeding established temperature-rise limitations under prescribed conditions of test and within the limitations of established standards.

control*: Broadly the methods and means of governing the performance of any electric apparatus, machine or system.

control apparatus*: A set of control devices used to accomplish the intended control functions.

General Requirements ICS 1-2000 control circuit (industrial control)*: The circuit that carries the electric signals directing the performance of the controller, but does not carry the main power circuit.

control-circuit transformer; control-power transformer: A voltage transformer utilized to supply a voltage suitable for the operation of control devices.

control device*: An individual device used to execute a control function.

control sequence diagram: A portrayal of the contact positions or connections which are made for each successive step of the control action.

control sequence table*: A tabulation of the connections that are made for each successive position of the controller.

control system*: A system in which deliberate guidance or manipulation is used to achieve a prescribed value of a variable.

control system diagram: A conceptual diagram of the functional interrelationship of subsystems, usually in block form, that does not include the process equipment or details of circuits and device elements.

controller diagram*: A diagram that shows the electrical connections between the parts comprising the controller and the external connections.

converter*: A network or device for changing the form of information or energy.

corrosion-resistant*: So constructed, protected or treated that corrosion will not exceed specified limits under specified test conditions.

counter: A network or device for storing integers and permitting these integers to be changed by unity or by an arbitrary integer as successive input signals are received.

creepage distance: The shortest distance along the surface of an insulating material between two conducting parts, or between a conducting part and the outer surface of the insulating enclosure considered as though metal foil were in contact with the accessible surfaces of the enclosure.

NOTE A joint between two parts of an insulating barrier is considered to be part of the surface except where the interstices are completely filled with an insulating material (cement).

critically damped: Damping that is sufficient to prevent any overshoot of the output following an abrupt stimulus.

current relay*: A relay that functions at a predetermined value of current. It may be an overcurrent, undercurrent, or reverse-current relay.

damping: The reduction or suppression of the oscillation of a system. See critically damped.

dead time: The time interval between the initiation of an input and the start of the resulting response. Dead time shall be expressed in seconds.

defeater: See interlocking deactivating means (defeater).

definite-purpose controller*: Any controller having ratings, operating characteristics, or mechanical construction for use under service conditions other than usual or for use on a definite type of application.

design test: See type test.

dielectric withstand-voltage tests*: Tests made to determine the ability of insulating materials and spacings to withstand specified overvoltages for a specified time without flashover or puncture.

The purpose of the tests is to determine the adequacy against breakdown of insulating materials and spacings under normal or transient conditions.

dimension drawing; outline drawing: A drawing (base plan, floor plan, etc.) which shows the physical space and mounting requirements of a piece of equipment. It shall be permitted to also indicate ventilation requirements and space provided for connections or the location to which connections are to be made.

direct current (DC) contactor: A contactor for the specific purpose of establishing and interrupting a DC power circuit.

disruptive discharge: The phenomena associated with the failure of insulation under electric stress; these include a collapse of voltage and the passage of current; the term applies to electrical breakdown in solid, liquid, and gaseous dielectrics, and combinations of these dielectrics.

disturbance*: An undesired input variable that may occur at any point within a feedback control system.

drift (as applied to devices): As applied to devices such as pressure switches, temperature switches, etc., is a change in operating characteristics over a specified number of operations or time and specified environmental conditions.

drift (as applied to systems): An undesired but relatively slow change in output over a specified time with a fixed reference input and fixed load, with specified environmental conditions. The specified time is normally after the warm-up period.

NOTE Drift shall be expressed in percent of the maximum rated value of the variable being measured.

drum controller*: An electric controller that utilizes a drum switch as the main switching element. A drum controller usually consists of a drum switch and a resistor.

drum switch*: A switch in which the electric contacts are made of segments or surfaces on the periphery of a rotating cylinder or sector, or by the operation of a rotating cam.

dynamic braking: resistor.

A control function that brakes the drive by dissipating its stored energy in a effective actuation time: The time that elapses between initial energization of the control circuit and the time the contacts of a normally open device close and remain closed or the contacts of a normally closed device open and remain open. Effective actuation time includes any contact bounce time or chatter time which occurs due to the operation of the device being tested.

electric contact*: The junction of conducting parts permitting current to flow.

General Requirements ICS 1-2000 electric controller*: A device or group of devices that serves to govern in some predetermined manner the electric power delivered to the apparatus to which it is connected.

electric motor controller*: A device or group of devices that serve to govern in some predetermined manner the electric power delivered to the motor.

NOTE For example, an electric motor controller may be a contactor or a starter rated in horsepower, kilowatts, or locked-rotor and full-load amperes. (The preceding sentence is not a part of the ANSI/IEEE Std 100 definition.)

electronic contactor: A contactor whose function is performed by electron tube(s) or semiconductor device(s).

electronic direct current (DC) motor controller: A phase-controlled rectifying system using semiconductors or tubes of the vapor- or gas-filled variety for power conversion to supply the armature circuit or the armature and shunt-field circuits of a DC motor, to provide adjustable-speed, adjustable- and compensated-speed, or adjustable- and regulated-speed characteristics.

electropneumatic controller*: An electrically supervised controller having some or all of its basic functions performed by air pressure.

failure of a control component or system: A state or condition in which a control component or system does not perform its essential function(s) when its ratings are not exceeded.

fault current: A current that results from the loss of insulation between conductors or between a cohductor and ground.

fault current, low level (as applied to a motor branch circuit): A fault current that is equal to or less than the maximum operating overload.

fault withstandability*: The ability of electrical apparatus to withstand the effects of specified electrical fault current conditions without exceeding specified damage criteria.

full-magnetic controller*: An electric controller having all of its basic functions performed by devices that are operated by electromagnets. ·

NOTE "Basic functions" usually refers to acceleration, retardation, line closing, reversing, etc. (This note is not a part of the ANSI/IEEE Std 100 definition.)

general-purpose controller: Any controller having ratings, characteristics, and mechanical construction for use under usual service conditions in accordance with the NEMA Standards Publications for Industrial Controls and Systems.

general-use switch*: A switch that is intended for use in general distribution and branch circuits. It is rated in amperes and is capable of interrupting the rated current at the rated voltage.

graphic symbol: Symbols used on single-line (one-line) diagrams, on schematic or elementary diagrams, or, as applicable, on connection or wiring diagrams. Graphic symbols are correlated with parts lists, descriptions, or instructions by means of designations.

ground; earth*: A conducting connection, whether intentional or accidental, by which an electric circuit or equipment is connected to the earth or to some conducting body of relatively large extent that serves in place of the earth.

illustrative diagram*: A diagram whose principal purpose is to show the operating principle of a device or group of devices without necessarily showing actual connections or circuits.

Illustrative diagrams may use pictures or symbols to illustrate or represent devices or their elements. Illustrative diagrams may be made of electric, hydraulic, pneumatic, and combination systems. They are applicable chiefly to instruction books, descriptive folders, or other media whose purpose is to explain or instruct.

inch: See jog.

industrial control*: The methods and means of governing the performance of an electric device, apparatus, equipment, or system used in industry.

insulation class: The classification of insulation materials for the purpose of establishing temperature limits for the use of the material. (See 8.3.2.1.)

interconnection diagram: A diagram which shows only the external connections between controllers and associated machinery and equipment.

interlock: A device actuated by the operation of some other device with which it is directly associated, to govern succeeding operations of the same or allied devices. Interlocks are either electrical or mechanical.

interlocking deactivating means; defeater*: A manually actuated provision for temporarily rendering an interlocking device ineffective, thus permitting an operation that would otherwise be prevented.

For example, when applied to apparatus such as combination controllers or control centers it refers to voiding of the mechanical interlocking mechanism between the externally operable disconnect device and the enclosure doors to permit entry into the enclosure while the disconnect device is closed.

intermittent periodic duty; intermittent duty: A duty in which the main contacts of an equipment remain closed for periods bearing a definite relation to the no-load periods, both periods being too short to allow the equipment to reach thermal equilibrium. See also periodic rating.

interrupting capability: The maximum value of current that a contact assembly is required to successfully interrupt at a specified voltage for a limited number of operations under specified conditions. The term is usually applied to abnormal or emergency conditions.

inverse time: A qualifying term applied to a relay indicating that its time of operation decreases as the magnitude of the operating quantity increases.

JR-drop compensation: A control function that compensates for voltage drop due to current. The amount of IR-drop compensation shall be expressed in percent of rated voltage.

For example:

IR - drop compensat.ion percent = Volts compensation at full - load current Rated full - load voltage x 100

General Requirements ICS 1-2000 isolating switch (means): A switch, or other mechanism, intended for isolating an electric circuit from the source of power.

NOTE It has no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means.

jog; inch*: A control function that provides for the momentary operation of a drive for the purpose of accomplishing a small movement of the driven machine.

jogging speed*: The steady-state speed that would be attained if the jogging pilot device contacts were maintained closed.

NOTE It may be expressed either as an absolute magnitude of speed or a percentage of maximum rated speed.

live parts: See conducting parts.

logic diagram: symbols.

A particular form of one-line or single-line diagram of a logic circuit using logic low-torque contactor: A contactor used in a motor circuit in addition to a line, directional, plugging, or accelerating contactor, for the purpose of limiting stalled torque of the motor to less than 100 percent of the full load torque by inserting resistance in the circuit.

magnetic brake*: A friction brake that is controlled by electromagnetic means. magnetic contactor*: A contactor actuated by electromagnetic means. magnetic control relay: A relay that is actuated by electromagnetic means.

When not otherwise qualified, the term refers to a relay intended to be operated by the opening and closing of its coil circuit, and having contacts designated for energizing or deenergizing, or both, the coils of magnetic contactors or other magnetically operated device.

make rating: The value of current for which a contact assembly is rated for closing a circuit repeatedly under specified operating conditions.

manual controller*: An electric controller having all of its basic functions performed by devices which are operated by hand.

manual reset*: A function that requires a manual operation to reestablish specific conditions.

master switch: A switch which dominates the operation of contactors, relays, or other remotely-operated devices.

motor-circuit switch: A switch rated in horsepower and capable of interrupting the maximum operating overload current of a motor of the same horsepower rating at the rated voltage. Such a switch is intended for use in a motor branch circuit.

multipole (electrical switching device): A term applied to a contact arrangement that includes two or more separate mating contact combinations; that is, two or more single-pole contact assemblies, having a common operating means.

negative feedback*: represents.

A feedback signal in a direction to reduce the variable that the feedback nonoverlapping contacts*: Combinations of two sets of contacts, actuated by a common means, each set closing in one of two positions, and so arranged that the contacts of one set open before the contacts of the other set close.

off delay: The intentional time period introduced between the initiation of an OFF signal and the change in output of the timing device.

For example: In a pneumatic timer, the period of time between the de-energization of the coil and the operation of its timed contacts.

oiltight control-circuit [pilot] devices*: Devices such as push-button switches, pilot lights, and selector switches that are so designed that, when properly installed, they will prevent oil and coolant from entering around the operating or mounting means.

on delay: The intentional time period introduced between the initiation of an ON signal and the change in output of the timing device.

For example: In a pneumatic timer, the period of time between the energization of the coil and the operation of its timed contacts.

one-line diagram; single-line diagram: A diagram that shows, by means of single lines and graphic symbols, the course of an electrical circuit or circuits and the component devices or parts used therein. Physical relationships are usually disregarded.

operate time: The elapsed time between the initial energization of the control circuit and the time the contacts of normally open device first touch or the time the contacts of a normally closed device first open.

operating overload*: The overcurrent to which electric apparatus is subjected in the course of the normal operating conditions that it may encounter.

For example: Those currents in excess of running current that occur for a short time as a motor is started or jogged are considered normal operating overloads for control apparatus. See 4.4.

overcurrent relay: A relay that operates when the current through the relay during its operating period is equal to or greater than its setting.

overlapping contacts*: Combinations of two sets of contacts, actuated by a common means, each set closing in one of two positions, and so arranged that the contacts of one set open after the contacts of the other set have been closed.

overload protection*: The effect of a device operative on excessive current, but not necessarily on short circuit, to cause and maintain the interruption of current flow to the device governed.

General Requirements ICS 1-2000 part-winding starter*: A starter that applies to voltage successively to the partial sections of the primary winding of an AC motor.

periodic rating*: The load that can be carried for the alternate periods of load and rest specified in the rating, the apparatus starting at approximately room temperature, and for the total time specified in the rating, without causing any of the specified limitations to be exceeded. See also intermittent periodic duty or intermittent duty.

pick-up and seal voltage (magnetically operated device): The minimum voltage, suddenly applied, at which the device moves from its deenergized into its fully energized position.

pick-up voltage or current (magnetically operated device): The voltage or current, suddenly applied, at which the device starts to operate.

pilot duty rating: A generic term formerly used to indicate the ability of a control device to control the coils of other devices.

plugging*: A control function that provides braking by reversing the motor line voltage polarity or phase sequence so that the motor develops a counter-torque that exerts a retarding force.

pole (electrical switching device): A combination of mating contacts that are normally open, or normally closed, or both.

pollution degree: The classification of pollution in terms of type, severity, combinations of pollutants, and frequency of occurrence. Pollution degrees are designated by a conventional number. See Annex A.

positive feedback: represents.

A feedback signal in a direction to increase the variable that the feedback production tests: Those tests that are made at the discretion of the manufacturer on some or all production units for the purpose of maintaining quality and performance.

process diagram; flow diagram: A conceptual diagram of the functional interrelationship of subsystems in block or pictorial form that shows process equipment such as machinery for proper understanding.

pulse: A signal of relatively short duration.

pushbutton station*: A unit assembly of one or more externally operable pushbutton switches, sometimes including other pilot devices such as indicating lights or selector switches, in a suitable enclosure.

rated insulation voltage, U;: The voltage to which rated impulse withstand voltage, clearances, and creepage distances are referred.

rated operational current, 18: A value of current, stated by the manufacturer, which takes into account the rated operational voltage, the rated frequency, the rated duty, the overvoltage category, and the type of a protective enclosure.

rated operational voltage, u.: A value of voltage which, combined with a rated operational current, determines the application of the equipment and to which the various tests and the overvoltage categories are referred. For polyphase circuits, it is stated as the voltage between phases.

rating (controller): An arbitrary designation of an operating limit. It is based on power governed, the duty and service required. A rating is arbitrary in the sense that it must necessarily be established by definite field standards and cannot, therefore, indicate the safe operating limit under all conditions that may occur.

rating (device)*: The designated limit(s) of the rated operating characteristic(s). Such operating characteristics as current, voltage, frequency, etc., may be given in the rating.

regeneration: The transfer of rotational energy through a motor and its control equipment back to its electrical source.

relay:

a. An electric device that is designed to interpret input conditions in a prescribed manner and after specified conditions are met to respond to cause contact operation or similar abrupt change in associated electric control circuits.

b. An electrically controlled, usually two-state, device that opens and closes electrical contacts to effect the operation of other devices in the same or another electric circuit.

c. A device in which a portion of one or more sets of electrical contacts is moved by an armature and its associated operating coil.

Inputs are usually electric, but may be mechanical, thermal, or other quantities. Limit switches and similar simple devices are not relays.

A relay may consist of several units, each responsive to specified inputs, the combination providing the desired performance characteristics.

release time: The time between initial deenergization of the control circuit and the initial opening of a normally open contact or the initial closing of a normally closed contact.

remote control: A control function that provides for initiation or change of a control function from a remote point.

repeat accuracy: A term used to express the degree of consistency of repeat operations under specified conditions.

reset: To restore a mechanism, storage, or device to a prescribed state. reversible counter: A counter that will count either up or down.

schematic diagram; elementary diagram: A diagram that shows all circuits and device elements of an equipment and its associated apparatus or any clearly defined functional portion thereof.

Such a diagram emphasizes the device elements of a circuit and their functions as distinguished from the physical arrangement of the conductors, devices or elements of a circuit system.

Circuits which function in a definite sequence should be arranged to indicate that sequence.

sealing voltage or current: The voltage or current that is necessary to seat the armature of a magnetic circuit closing device from the position at which the contacts first touch each other.

General Requirements ICS 1-2000 semimagnetic controller*: An electric controller having only part of its basic functions performed by devices which are operated by electromagnets.

service* (controller): The specific application in which the controller is to be used.

Example: a. General purpose

b. Definite purpose

1. Crane and hoist

2. Elevator

3. Machine tool short-time capability: The ability of electrical apparatus to operate within specified performance criteria when carrying electrical overloads of a specified current and time duration under specified conditions.

short-time rating*: A rating that defines the load that can be carried for a short and definitely specified time, the machine, apparatus, or device being at approximately room temperature at the time the load is applied.

single-line diagram: See one-line diagram.

single pole (electrical switching device): A contact arrangement in which all contacts connect in one position or another to a common contact.

snap action: A rapid motion of the contacts from one position to another position, or their return. This action is relatively independent of the rate of travel of the actuator.

solid-state contactor: A contactor whose function is performed by semiconductor device(s).

starter (electric motor): A form of electric motor controller that includes the switching means necessary to start and stop a motor in combination with suitable overload protection.

surface-mounted (type): Designed to be secured to and to project from a flat surface. switch*: A device for opening and closing or for changing the connection of a circuit. A switch is understood to be manually operated, unless otherwise stated.

system voltage (nominal): The root-mean-square, phase-to-phase voltage by which the electrical distribution system is designated and to which certain operational characteristics of the system are related (ANSI C84.1).

The nominal system voltage is near the voltage level at which the system normally operates. To allow for operating contingencies, systems generally operate at voltage levels about five percent to ten percent below the maximum system voltage for which system components are designed (ANSI C84.1 ). See: utilization voltage.

three-wire control*: A control function that utilizes a momentary-contact pilot device and a holding-circuit contact to provide undervoltage protection.

time delay*: A time interval that is purposely introduced in the performance of a function.

transient: That part of the change in a variable that disappears during transition from one steady-state operating condition to another.

two-wire control*: A control function that utilizes a maintained-contact type of pilot device to provide undervoltage release.

type test; design test: A test that demonstrates compliance of a product design with applicable standards; it is not intended to be a production test.

undervoltage protection; low-voltage protection*: The effect of a device, operative on the reduction or failure of voltage, to cause and maintain the…