1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL 991Tests for Safety-RelatedControls Employing Solid-StateDevicesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL
2、 NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL Standard for Safety for Tests for Safety-Related Controls Employing Solid-State Devices, UL 991Third Edition, Dated October 22, 2004Summary of TopicsThese revisions to UL 991 are being issued to address editorial ma
3、intenance of UL Standardsfor Safety. These revisions are considered to be non-substantive and not subject to ULs STPprocess.Text that has been changed in any manner or impacted by ULs electronic publishing system is markedwith a vertical line in the margin. Changes in requirements are marked with a
4、vertical line in the marginand are followed by an effective date note indicating the date of publication or the date on which thechanged requirement becomes effective.A reference to UL 60730-1 and/or a Part 2 standard from that series has been added to this standard.The addition of this reference pr
5、ovides an alternate standard for investigating components currentlycovered by UL 873 or UL 244A until October 19, 2016. This added reference will facilitate the use ofcomponents that have been investigated to the UL 60730 series. Such components have beendetermined to fulfill the requirements of the
6、 legacy standards.UL 60730-1 (4th Edition) becomes effective on October 19, 2016. All components that were previouslyinvestigated to the requirements in UL 873 or UL 244A will have to comply with the requirements in eitherUL 60730-1 and/or a Part 2 standard from that series in order to maintain UL L
7、isting or Recognition, asappropriate. UL 873 and UL 244A legacy controls standards will be withdrawn on October 19, 2016.This is intended to provide end product manufacturers with sufficient time to a) address the impact of thestandards changes during normal design changes over the intervening years
8、, b) submit any modifiedproducts for investigation, and c) implement any necessary changes in production.All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying, recording, or otherw
9、isewithout prior permission of UL.UL provides this Standard as is without warranty of any kind, either expressed or implied, including butnot limited to, the implied warranties of merchantability or fitness for any purpose.In no event will UL be liable for any special, incidental, consequential, ind
10、irect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or theinability to use this Standard, even if UL or an authorized UL representative has been advised of thepossibility of such damage. In no event shall ULs liability for an
11、y damage ever exceed the price paid forthis Standard, regardless of the form of the claim.Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold ULharmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonableattorn
12、eys fees) resulting from any error or deviation introduced while purchaser is storing an electronicStandard on the purchasers computer system.The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, figures,and/or other elements of the Standard having futur
13、e effective dates as indicated in the note following theaffected item. The prior text for requirements that have been revised and that have a future effective dateare located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice.JUNE 9, 2010 UL 991 tr1UL COPYRIGHTED MATERIAL NOT A
14、UTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJUNE 9, 2010 UL 991tr2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 22, 2004(Title Page Reprinted: June 9, 2010)1UL 991Standard for Tests
15、 for Safety-Related Controls Employing Solid-StateDevicesFirst Edition January, 1989Second Edition June, 1995Third EditionOctober 22, 2004This UL Standard for Safety consists of the Third Edition including revisionsthrough June 9, 2010.Comments or proposals for revisions on any part of the Standard
16、may besubmitted to UL at any time. Proposals should be submitted via a ProposalRequest in ULs On-Line Collaborative Standards Development System (CSDS)at http:/.ULs Standards for Safety are copyrighted by UL. Neither a printed nor electroniccopy of a Standard should be altered in any way. All of ULs
17、 Standards and allcopyrights, ownerships, and rights regarding those Standards shall remain thesole and exclusive property of UL.The text included in paragraphs 11.2.1, 11.3.1, 11.4.1, 11.4.2, and 11.4.3 isbased on material in Electromagnetic compatibility (EMC) Part 4: Testing andmeasuring techniqu
18、es Section 11: Voltage dips, short interruptions and voltagevariations immunity tests, IEC 61000-4-11, First edition copyright 1994-06. Thismaterial is used in this Standard with the consent of the IEC and the AmericanNational Standards Institute (ANSI). The IEC copyrighted material has beenreproduc
19、ed with permission from ANSI. ANSI should be contacted regarding thereproduction of any portion of the IEC material. Copies of the IEC Publication61000-4-11 may be purchased from ANSI, 11 West 42nd Street, New York, NewYork, 10036, (212)642-4900.COPYRIGHT 2010 UNDERWRITERS LABORATORIES INC.UL COPYRI
20、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAPRIL 2, 2008UL 9912No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .62 Components 63 Units of Meas
21、urement .74 Undated References 75 Glossary .7INVESTIGATION6 General 87 Failure-Mode and Effect Analysis (FMEA) .118 Electrical Supervision .11ENVIRONMENTAL STRESS TESTS9 General .1210 Overvoltage and Undervoltage Tests 1311 Power Supply Voltage Dips and Short Interruption Test .1411.1 General .1411.
22、2 Test voltage levels .1411.3 Test Conditions 1411.4 Test procedure .1512 Transient Overvoltage Test 1513 Voltage Variation Test .2113.1 General .2113.2 Test duration and procedure .2114 Electromagnetic Susceptibility Tests 2214.1 General .2214.2 Electrical fast transient/burst test .2314.3 Electric
23、al fast transient/burst generator 2614.4 Test levels 3014.5 Test procedure .3114.6 Test conditions .3214.7 Signal circuit fast transient test .3214.8 Radiated EMI test 3314.9 Digital equipment modulation interference test .3514.10 Keying interference test 3615 Electrostatic Discharge Test 3615.1 Gen
24、eral .3615.2 Test methods 3615.3 Electrostatic discharge probe 3715.4 Discharge test .3815.5 Electric field test .3815.6 Magnetic field test 3916 Composite Operational and Thermal Cycling Test 4017 Test for Effects of Shipping and Storage .4118 Thermal Cycling Test 4119 Humidity Test 4120 Dust Test
25、43APRIL 2, 2008 UL 991 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL21 Vibration Test 4421.1 General .4421.2 Mounting 4421.3 Vibration characteristics .4422 Jarring Test 47COMPUTATIONAL INVESTIGATION AND DEMONSTRATED METHOD23 General 4724
26、Computational Investigation 4824.1 General .4824.2 Preliminary procedure .4824.3 Parts stress method 4824.4 Operational test 5025 Demonstrated Method .5125.1 General .5125.2 Test method .53POWER CYCLING TESTS26 General 5427 Overload Test 5428 Endurance Test 54FOLLOW-UP PROGRAM29 General 55RATING30 G
27、eneral 55MARKING31 General 55SUPPLEMENT SA - FOLLOW-UP PROGRAMINTRODUCTIONSA1 Scope SA1SA2 Glossary SA2SA3 Responsibilities of the Manufacturer .SA3SA3.1 General SA3SA3.2 Records SA3SA3.3 Equipment .SA4SA3.4 Follow-up program SA5SA4 Responsibilities of the Field Representative SA16APRIL 2, 2008UL 99
28、14UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAPRIL 2, 2008 UL 991 5No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements appl
29、y to controls that employ solid-state devices and are intended for specifiedsafety-related protective functions.1.2 These requirements address the potential risks unique to the electronic nature of a control. Equipmentor components employing an electronic feature shall also comply with the basic con
30、struction andperformance requirements contained in the applicable end-product or component standard. Theserequirements are intended to supplement applicable end-product or component standards and are notintended to serve as the sole basis for investigating the risks of fire, electric shock, or injur
31、y to personsassociated with a control.1.3 These requirements do not cover controls covered by end-product standards in which an electroniccontrol investigation is specified.1.4 Sections922contain standardized test methods for investigating the performance of an electroniccontrol when subjected to pa
32、rticular environmental stresses. The suitability of each test to a given controlshall be determined by the end-product standard(s). Determination shall include an assessment of:a) Whether the control will be exposed to a particular environmental stress in its application,andb) Whether the response o
33、f the control to a particular environmental stress is relevant to itsintended safety-related protective function in its application.2 Components2.1 Except as noted in 2.2, a component of a product covered by this standard shall comply with therequirements for that component.2.2 A component is not re
34、quired to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this standard, orb) Is superseded by a requirement in this standard.2.3 A component shall be used in accordance with its rating establis
35、hed for the intended conditions ofuse.2.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used only under
36、 those specific conditions.OCTOBER 22, 2004UL 9916UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
37、3.2 In addition to being stated in the inch/pound units that are customary in the USA, each of therequirements in this standard is also stated in units that make the requirement conveniently usable incountries employing the various metric systems (practical SI and customary).4 Undated References4.1
38、Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.5 Glossary5.1 For the purpose of this standard, the following definitions apply.5.2 CONTROL For the purpose of this standard, a c
39、ontrol shall be considered a complete control, asubassembly, a circuit, or an individual component.5.3 CRITICAL CIRCUIT A circuit that performs one or more safety related functions and has beenidentified as critical in accordance with General, Section 6, and Failure Mode and Effect Analysis,Section
40、7.5.4 CRITICAL COMPONENT A component that performs one or more safety-related functions andthat has been identified as critical in accordance with General, Section 6, and Failure Mode and EffectAnalysis, Section 7.5.5 CRITICAL FAILURE A failure of a component or circuit that results in a condition,
41、such as therisk of fire, electric shock, or injury to persons, in the end product application.5.6 CRITICAL FUNCTION The failure of a specific action of a control that results in a condition, suchas the risk of fire, electric shock, or injury to persons in the end product application.5.7 DECADE 3.32
42、octaves.5.8 DISTINCTIVE AUDIBLE SIGNAL A signal obtained from various devices such as bells, horns,sirens, and buzzers, or a variance in the nature of the signal such as a continuous signal obtainedunder one condition and a pulsing signal under another.5.9 ELECTROMAGNETIC INTERFERENCE (EMI) The impa
43、irment of a desired electromagneticsignal by an electromagnetic disturbance.5.10 ELECTROMAGNETIC SUSCEPTIBILITY The characteristic of electronic equipment that resultsin undesirable responses when subjected to an electromagnetic disturbance.5.11 OCTAVE A range of signals having a frequency ratio of
44、2:1.5.12 SUPERVISION The monitoring of a circuit so that a fault condition will result in a troubleindication or other acceptable action.OCTOBER 22, 2004 UL 991 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.13 TEST ACCELERATION FACTOR A n
45、umber, that varies with the test temperature, chosen toconduct the Demonstrated Method, Section 25. It is used to calculate the required test unit-hours.5.14 TEST UNIT-HOURS The mathematical product of the number of samples under test and thetime of the test.5.15 TROUBLE INDICATION A visible or audi
46、ble signal intended to indicate a fault or troublecondition, such as an open or shorted condition of a component in the device or an open or ground inthe connected wiring.5.16 USAGE LEVEL The range of hours per year that a control is expected to be subjected toelectrical or thermal stress or a combi
47、nation of electrical and thermal stresses.INVESTIGATION6 General6.1 A description of the operation and safety features of the control with respect to the controlled elementshall be provided by the manufacturer and shall be used as a guide in the examination and test of thedevice. For example, the op
48、eration of an electronic temperature limiting control might be in an inactivestate in a certain temperature range but is intended to disconnect the load from the electrical supply at ahigher predetermined temperature.6.2 A control designed for a specified safety-related protective function shall be
49、investigated inaccordance with a four part program consisting of environmental stress tests, power cycling tests,investigation of critical components, and production-line tests. The investigation of controls shall be basedon Figure 6.1.This is generated text for figtxt.OCTOBER 22, 2004UL 9918UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 6.1Investigation flowchartOCTOBER 22, 2004 UL 991 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCT
