1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1004-3 Thermally Protected MotorsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
2、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Thermally Protected Motors, UL 1004-3 Second Edition, Dated February 27, 2015 Summary of Topics This new edition of ANSI/UL 1004-3 includes the following changes in requirements: Removal of the cheesecloth requirement
3、 from the locked-rotor temperature and endurance tests Revised running heating test for direct drive fan air-over motors The revised requirements are substantially in accordance with Proposal(s) on this subject dated November 7, 2014. All rights reserved. No part of this publication may be reproduce
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8、n this Standard are now in effect, except for those 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 d
9、ate are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. FEBRUARY 27, 2015 UL 1004-3 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 27, 2015 UL 1004-3 tr2 No Text on This PageUL COPYRIGHTED MATER
10、IAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 27, 2015 1 UL 1004-3 Standard for Thermally Protected Motors First Edition September, 2008 Second Edition February 27, 2015 This ANSI/UL Standard for Safety consists of the Second Edition. The most recent
11、 designation of ANSI/UL 1004-3 as an American National Standard (ANSI) occurred on February 25, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be sub
12、mitted 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 copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Stan
13、dards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 1004-3-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL F
14、EBRUARY 27, 2015 THERMALLY PROTECTED MOTORS - UL 1004-3 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Glossary 5 CONSTRUCTION 3 Spacings .6 4 Thermal Protection Systems 6 5 Intention
15、ally Weak Trace (IWT) .7 PERFORMANCE 6 General 7 7 Motors Additionally Provided with Electronic Protection 9 8 Locked Rotor Temperature Test .10 8.1 General 10 8.2 Automatically reset protectors .12 8.3 Manually reset protectors .12 8.4 Thermal cutoffs .12 8.5 Self-holding protectors .13 8.6 Single-
16、operation devices .13 9 Locked Rotor Endurance Test .13 9.1 General 13 9.2 Automatically reset protectors .14 9.3 Manually reset protectors .14 9.4 Self-holding protectors .15 9.5 Self-holding protector cold reset .15 10 Running Heating Temperature Test .15 10.1 General .15 10.2 Continuous duty moto
17、rs .15 10.3 Polyphase motors 19 10.4 Ultimate trip current .19 10.5 Intermittent duty motors .20 10.6 Air-over motors 20 10.7 Polyphase air-over motors .21 11 Intentionally Weak Trace (IWT) Tests .21 11.1 General .21 11.2 Safety function .21 11.3 Rating 22 11.4 Full range .22 11.5 Evaluation of func
18、tionality 1 IWT .22 11.6 Evaluation of functionality 2-4 IWT .23 MARKINGS 12 General 25 FEBRUARY 27, 2015 THERMALLY PROTECTED MOTORS - UL 1004-3 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INSTRUCTIONS 13 General 26 FEBRUARY 27, 2015 TH
19、ERMALLY PROTECTED MOTORS - UL 1004-3 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 This Standard is intended to be read together with the Standard for Rotating Electrical Machines General Requirements, UL 1004-1.
20、The requirements in this Standard supplement or amend the requirements in UL 1004-1. The requirements of UL 1004-1 apply unless modied by this Standard. 1.2 This Standard applies to motors that rely upon a device (thermal motor protector) to prevent overheating under at least one operating condition
21、. These motors shall be identied as thermally protected motors. 1.3 This Standard applies to motors protected either by electromechanical thermal motor protectors or solid-state thermal motor protectors. 1.4 This Standard applies to impedance protected motors where the manufacturer has provided a su
22、pplementary thermal motor protector. 1.5 The requirements in this Standard are intended to evaluate a specic motor/protector combination. When the motor, the protector, or the motor/protector combination is changed, the combination shall be reevaluated. 1.6 This Standard applies to motors provided w
23、ith coordinated protection where Locked Rotor protection is provided by one means and Running Heating protection is provided by another as required by 7.11. 2 Glossary 2.1 For the purpose of this standard, the following denitions apply. 2.2 AUTOMATICALLY RESET PROTECTOR A device that is calibrated t
24、o open the motor circuit upon reaching a certain temperature and automatically closes the circuit once the device has cooled to a lower temperature. 2.3 INTENTIONALLY WEAK TRACE (IWT) A trace or conductive path provided on a printed-wiring board that is specically designed to open under overcurrent
25、conditions in order to provide a protective function for circuitry and components. 2.4 MANUALLY RESET PROTECTOR A device that is calibrated to open the motor circuit upon reaching a certain temperature and requires a manual action to reclose the motor circuit. 2.5 PRIMARY PROTECTOR A protector that
26、is expected to operate during the abnormal testing of a motor sample. 2.6 SELF-HOLDING PROTECTOR A device that is calibrated to open the motor circuit upon reaching a certain temperature but requires both cool down below the calibration point and removal of power for resetting of the protector. FEBR
27、UARY 27, 2015 THERMALLY PROTECTED MOTORS - UL 1004-3 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.7 SINGLE-OPERATION DEVICE A device that is calibrated to open a motor circuit upon being exposed to a dened temperature and which is rese
28、t only upon cooling to -35C (-31F) or lower. 2.8 THERMAL CUTOFF A device that is calibrated to open a motor circuit upon being exposed to a dened temperature. 2.9 THERMAL MOTOR PROTECTOR, THERMAL PROTECTOR, OR PROTECTOR A device installed integrally within a motor that is responsive to motor current
29、 and temperature or temperature only and that, when applied as intended, prevents motor overheating. Types are: thermal cutoff, automatically reset, manually reset, self-holding and single-operation. 2.10 THERMALLY PROTECTED MOTOR A motor that relies upon a device (protector) to prevent overheating.
30、 CONSTRUCTION 3 Spacings 3.1 Spacings at a protector terminal intended to be used as a eld-wiring terminal shall not be less than those specied in the Table for “Minimum acceptable spacings at eld wiring terminals for voltages up to 750” or the Table for “Minimum acceptable spacings at eld wiring te
31、rminals for voltages over 750” of UL 1004-1, as appropriate. 4 Thermal Protection Systems 4.1 Motors where the motor current is so great as to preclude the use of a thermal motor protector may use a combination of thermal motor protector or a temperature sensor and relay or contactor to achieve the
32、functionality of a thermally protected motor provided that all the following are met: a) The normally closed thermal motor protector is wired in series with the relay/contactor coil so that, in normal operation, the relay is electrically latched and thus any opening of the relay/ contactor coil circ
33、uit would disable the motor. b) The relay/contactor has been evaluated and found to comply with the Standard for Industrial Control Equipment, UL 508. Specically: 1) The relay shall undergo 50 cycles of overload testing in accordance with UL 508; 2) The relay shall undergo 6,000 cycles of endurance
34、testing in accordance with UL 508; and 3) The relay shall undergo the Short Circuit Test of UL 508. c) The thermal motor protector used to control the relay has a pilot duty rating suitable for the relay to be controlled. d) The combination (temperature sensing device, relay, wiring, and motor) have
35、 been evaluated to the requirements of this Standard. FEBRUARY 27, 2015 THERMALLY PROTECTED MOTORS - UL 1004-3 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.2 Because a solid-state relay is considered a potential single-point of failure
36、 (i.e., the relay “contacts” may fail in the shorted condition thus obviating the protective functionality), solid-state relays may only be used in this capacity if either redundancy is provided or the solid-state relay complies with the Standard for Automatic Electrical Controls for Household and S
37、imilar Use, Part 1: General Requirements, UL 60730-1. 5 Intentionally Weak Trace (IWT) 5.1 A motor, as described in 7.10, shall comply with the requirements of this Section and Section 11, Intentionally Weak Trace (IWT) Tests 5.2 IWTs shall: a) Not be used in lieu of branch circuit overcurrent prote
38、ction; b) Be designed as single use; and c) Not be designed or considered to be a user-serviceable part. 5.3 If the IWT opens, the printed-wiring board (PWB) or the entire control shall be replaced or discarded. Bridging of an opened IWT with a fuse or other overcurrent protective device shall not b
39、e permitted. 5.4 It shall be established whether reliable performance of the IWT is required to provide a required safety function, i.e., motor overtemperature protection, 11.2. 5.5 It shall be established whether the IWT is designed as a full range device, 11.4, or is intended to protect against ca
40、tastrophic, short-circuit, conditions only. 5.6 If the IWT is determined to be designed to function as a full range device, the rating of the IWT shall be established in accordance with 11.3. PERFORMANCE 6 General 6.1 A motor that uses alternate major insulation system component materials shall have
41、 each material subjected to the Locked Rotor Endurance Test, Section 9. Following the tests, the motor shall not exhibit an increased risk of re or electric shock. Exception: It shall not be necessary to repeat the Locked Rotor Endurance Test, Section 9, to evaluate the suitability of the alternate
42、material when all the following are met: a) The alternate major insulation system component is of the same geometry, the same polymeric class (thermoplastic/thermoset), and is other than the magnet wire; b) The Electrical and Mechanical Tensile Strength RTIs of the alternate material are, at a minim
43、um, equal to the rating of the insulation system; and c) The heat deection temperature for the alternate material is either as high as or higher than: 1) The highest temperature plus 10C recorded during the Locked Rotor Temperature Test, Section 8, conducted on the motor originally; or FEBRUARY 27,
44、2015 THERMALLY PROTECTED MOTORS - UL 1004-3 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2) The heat deection temperature for the original material. 6.2 It shall not be necessary to repeat the Locked Rotor Endurance Test, Section 9, for
45、alternate minor insulation system components. 6.3 The performance tests are to be conducted on representative samples of motor / protector combinations. The number of samples required to be tested are to be consistent with the range of motors to be protected. 6.4 A protector calibrated to have a tol
46、erance in excess of 5C ( 9F) of the nominal opening temperature or 15C ( 27F) of the closing temperature, shall be tested in accordance with 6.5 to determine that the wider tolerance protector has an intended locked-rotor cycling life. 6.5 As required by 6.4, the following motor/protector combinatio
47、ns are to be tested to all temperature and endurance requirements as follows: a) One sample protector calibrated to open at the maximum temperature shall be subjected to all tests required in this Standard; and b) One sample calibrated to open at the minimum temperature and close at the maximum temp
48、erature shall be subjected to the Locked Rotor Endurance Test, Section 9, except the duration is to be 18 days. 6.6 When a secondary or back-up protector is provided, it shall not operate under any conditions of test. 6.7 Polyphase motors shall be provided with protectors so that each phase winding
49、is protected from overheating. 6.8 A single-operation device shall not reset itself at a temperature higher than minus 35C (minus 31F). 6.9 During the tests, the current is to be monitored and recorded at key events such as when the load is increased during the Running Heating Temperature Test, Section 10, or when the protector trips during the Locked Rotor Temperature Test, Section 8. Exception: The current is not required to be monitored during the Locked Rotor Endurance Test, Sectio
