1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 244A Solid-State Controls for AppliancesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
2、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Solid-State Controls for Appliances, UL 244A Third Edition, Dated April 30, 2003 SUMMARY OF TOPICS The revisions to UL 244A dated August 15, 2013 are being issued to adopt the following proposals: 1. Addition O
3、f The Abnormal Operations Test Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date o
4、f publication or the date on which the changed requirement becomes effective. The new requirements are substantially in accordance with Proposal(s) on this subject dated April 12, 2013. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted i
5、n any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any pu
6、rpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has b
7、een advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and agai
8、nst any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for tho
9、se paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are prece
10、ded by a SUPERSEDED REQUIREMENTS notice. AUGUST 15, 2013 UL 244A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 15, 2013 UL 244A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTI
11、ON WITHOUT PERMISSION FROM UL April 30, 2003 (Title Page Reprinted: August 15, 2013) 1 UL 244A Standard for Solid-State Controls for Appliances First Edition February, 1986 Second Edition January, 1994 Third Edition April 30, 2003 This UL Standard for Safety consists of the Third Edition including r
12、evisions through August 15, 2013. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrigh
13、ted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATER
14、IAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 31, 2007 SOLID-STATE CONTROLS FOR APPLIANCES - UL 244A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION
15、 1 Scope .7 2 Undated References 8 3 Glossary .8 4 Components 10 5 Units of Measurement 11 CONSTRUCTION 6 General .11 7 Frame and Enclosure 11 8 Accessibility of Live Parts .12 9 Current-Carrying Parts 13 10 Internal Wiring 13 11 Splices and Connections 14 11.1 General .14 11.2 Wire-wrapped connecti
16、ons 15 11.3 Connections to frame .16 12 Separation of Circuits .16 12.1 General .16 13 Insulating Material 18 13.1 General .18 13.2 Support of live parts 18 14 Printed-Wiring Boards .19 15 Components .19 15.1 Switching devices 19 15.2 Capacitors .20 15.3 Power-switching semiconductors .20 15.4 Isola
17、tion devices .21 16 Transformers .21 16.1 General .21 16.2 Isolation transformers .22 17 Spacings .22A 18 Alternate Spacings Clearances and Creepage Distances 24 19 Bonding of Internal Parts for Grounding .25 19.1 General .25 19.2 Bonding conductor .26 19.3 Bonding connections .27 20 Class 2 Circuit
18、s .28 PERFORMANCE 21 General 31 22 Temperature Test .32 22.1 General .32 22.2 Operation .33 22.3 Temperature measurements .35 23 DC Offset Voltage Test 36 24 Abnormal Operation Test 36 OCTOBER 31, 2007 SOLID-STATE CONTROLS FOR APPLIANCES - UL 244A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
19、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 24.1 Motor .36 24.2 Component failure 37 24.3 Abnormal switching test .38 25 Limited Power Point Determination Test 38A 25.1 General 38A 25.2 Option No. 1 .38A 25.3 Option No. 2 .39 25.4 Component failure 40 25.5 Overload test 41 26 Isolation T
20、ests 42 26.1 General .42 26.2 Pulse transformer burnout tests 42 26.3 Optical isolator tests 44 26.4 Component failure 44 27 Power-Switching Semiconductors .45 27.1 General .45 27.2 Overload test 46 27.3 Endurance 47 28 Overvoltage and Undervoltage Test .48 29 Voltage Surge Test .48 30 Power Supplie
21、s .51 30.1 Short circuit 51 30.2 Stalled rotor .52 31 Component Failure Test .52 32 Electronic Component Evaluation .53 33 Dielectric Voltage-Withstand Test .53 33.1 General .53 33.2 Primary circuits 54 33.3 Isolated secondary circuits 55 33.4 Transformers 55 MANUFACTURING AND PRODUCTION LINE TESTS
22、34 DC Offset Voltage Test 56 RATING 35 Details .56 35.1 Input 56 35.2 Output 56 35.3 Operational ambient temperature .57 MARKINGS 36 General 57 APPENDIX A Standards for ComponentsA1 AUGUST 15, 2013 SOLID-STATE CONTROLS FOR APPLIANCES - UL 244A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
23、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 31, 2007 SOLID-STATE CONTROLS FOR APPLIANCES - UL 244A 5 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. OCTOBER 31, 2007 SOL
24、ID-STATE CONTROLS FOR APPLIANCES - UL 244A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover component electronic controls intended to be factory installed on or in appliances and other utiliz
25、ation equipment rated 600 V or less, used in ordinary dry locations as dened in the National Electrical Code, NFPA 70, and that comply with the requirements for such appliances and equipment. 1.2 For a control covered by this standard, it is assumed that: a) No voltage greater than 600 V above groun
26、d will be present in a control, b) An isolation transformer, if provided, will generally furnish power at a lower potential than the primary voltage, and c) The output of the control will not be located in a circuit operating at greater than 600 V above ground in the end-use product. If conditions o
27、ther than these are provided, consideration shall be given to the need for additional requirements. 1.3 A control covered by this standard is a single device or a series of separate components with interconnecting wiring employing one or more input power and possibly signal ports, solid-state circui
28、try, and one or more output switching components to directly control all or a portion of the end-use product load. Included are controls that respond directly or indirectly to changes in temperature, humidity, or pressure to affect operation of an appliance, function as an electronic timer, or elect
29、ronically store or process information by virtue of a memory system. 1.4 These requirements cover controls intended for connection only to a low-voltage circuit of limited power supplied by a primary battery or by a Class 2 transformer, where a failure of such a control would result a risk of re, el
30、ectric shock, or injury to persons in the end-use product. 1.5 These requirements do not cover a control intended for installation in or on refrigeration or air conditioning equipment that is used in industrial applications or in hazardous locations as dened in the National Electrical Code, NFPA 70.
31、 Such equipment is covered in the Standard for Temperature- Indicating and -Regulating Equipment, UL 873. Compliance with the Standard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1, and/or the applicable Part 2 standard from the UL 60730 se
32、ries fullls these requirements. 1.5 revised March 4, 2010. UL 873 will be withdrawn on October 19, 2016. 1.6 These requirements do not cover controls for use where exposed to oil, grease vapors, lint, other contaminants, or high humidity in the end application. 1.7 These requirements address the pot
33、ential risks unique to the electronic nature of a control. Equipment or components employing an electronic feature shall also comply with the basic requirements contained in the applicable end-product or component standard. These requirements are intended to supplement applicable end-product or comp
34、onent standards and are not intended to serve as the sole basis for investigating all risks associated with a control. For example, requirements for the means of enclosing live parts, mechanical assembly of components, corrosion protection, use of polymeric materials, evaluation of internal wiring a
35、nd connections within the control, calibration, and similar requirements, are not included in this standard. MARCH 4, 2010 SOLID-STATE CONTROLS FOR APPLIANCES - UL 244A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 Undated References 2.
36、1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3 Glossary 3.1 For the purpose of this standard the following denitions apply. 3.2 CLASS 2 CIRCUIT An isolated secondary circ
37、uit involving a potential of not more than 42.4 V peak supplied by: a) An inherently-limited Class 2 transformer; b) A combination of an isolated transformer secondary winding and a xed impedance or regulating network that together comply with the performance requirements for an inherently- limited
38、Class 2 transformer; c) A dry-cell battery having output characteristics not greater than those of an inherently-limited Class 2 transformer; d) Any combination of (a), (b), and (c) that together comply with the performance requirements for an inherently-limited Class 2 transformer; or e) One or mor
39、e combinations of a Class 2 transformer and an overcurrent protective device that together comply with the performance requirements for a noninherently-limited Class 2 transformer. A circuit derived from a line-connected circuit by connecting impedance in series with the supply circuit as a means of
40、 limiting the voltage and current is not a Class 2 circuit. See Class 2 Circuits, Section 20. 3.3 CONFORMAL COATING An insulating coating which conforms to the conguration of the object coated and is used as a protective covering against environmental conditions or when electrical spacings are insuf
41、ficient. 3.4 CONTROLLED ENVIRONMENT An environment: a) Relatively free of conductive contaminants, such as normal cooking vapors, carbon dust, and similar contaminants, which are a result of the end-use product in which a control will be installed or due to the location of the end-use product, and b
42、) Not subject to humidity and the formation of condensation. A controlled environment is provided, for example, by means of a: 1) Hermetically sealed enclosure; 2) Encapsulation; 3) A conformal coating; or 4) A gasketed, tight-tting enclosure or lter system preventing contamination in conjunction wi
43、th a system preventing condensation for example, the maintaining of the surrounding air at constant temperature and a suitably low relative humidity. MARCH 4, 2010 SOLID-STATE CONTROLS FOR APPLIANCES - UL 244A 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P
44、ERMISSION FROM UL 3.5 DEAD-CASE-MOUNTED SEMICONDUCTOR A semiconductor, such as a triac or silicon- controlled rectier, employing an integral metal tab or stud that is insulated from live parts. 3.6 ELECTRICAL STRESS FACTOR For a circuit component, the ratio of operating electrical stress to rated el
45、ectrical stress. Examples include the ratio of operating wattage to maximum rated wattage of a resistor and operating voltage to maximum rated voltage of a capacitor. A circuit component having no assigned maximum operating electrical rating is made the subject of an investigation. 3.7 HAZARDOUS ENE
46、RGY Circuit energy that involves a risk of re or electric shock. 3.8 ISOLATED SECONDARY CIRCUIT A circuit derived from an isolated secondary winding of a transformer and that has no direct connection back to the line-connected circuit, other than through the grounding means. A secondary circuit that
47、 has a direct connection back to the line-connected circuit is considered part of the line-connected circuit. 3.9 LIMITED-ENERGY CIRCUIT A line-connected circuit in which the wattage from any point in the circuit to any return to the power supply is limited to 15 W; or an isolated secondary circuit
48、in which the wattage from any point in the circuit to any return to the power supply is limited to 50 W. 3.10 LINE-CONNECTED CIRCUIT A circuit in which the wiring and components are conductively connected to the branch circuit. It is also called a primary- or direct-connected circuit. See also 3.8.
49、3.11 OPPOSITE POLARITY A difference in potential between two points, such that shorting of these two points results in a condition involving an overload; rupturing of printed wiring-board-tracks, components, or fuses; or similar condition. 3.12 OPTICAL ISOLATOR (PHOTON-COUPLED ISOLATOR) A circuit-coupling device that provides circuit isolation by means of a light source and sensor integrated into a single package. 3.13 SAFETY CIRCUIT A primary or secondary circuit that is relied upon to reduc
