UL SUBJECT 508E-2006 Outline of Investigation for IEC Type 2 Coordination Short Circuit Tests of Electromechanical Motor Controllers in Accordance with IEC Publication 947-4-1 (I.pdf
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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNovember 15, 20061SUBJECT 508EOUTLINE OF INVESTIGATIONFORIEC TYPE 2 COORDINATION SHORT CIRCUIT TESTS OFELECTROMECHANICAL MOTOR CONTROLLERS IN ACCORDANCE WITHIEC PUBLICATION 947-4-1Issue Number: 3
2、NOVEMBER 15, 2006Summary of TopicsThis new issue of SU 508E is being issued through ULs electronicpublishing system to ensure format uniformity between the PDF andHTML versions of the document. No substantive changes have beenincorporated in the document.The UL Foreword is no longer located within t
3、he UL Standard. For informationconcerning the use and application of the requirements contained in thisStandard, the current version of the UL Foreword is located onULStandardsInfoNet at: http:/ 2006 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDIST
4、RIBUTION WITHOUT PERMISSION FROM ULNOVEMBER 15, 2006SUBJECT 508E2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Normative References .43 Definitions 44 General 6CONSTRUCTION5 General 6PERFOR
5、MANCE6 Enclosure Tests 77 Conductors, Conduit, and Terminal Torque .78 Selection of Heater Elements .79 Calibration of Test Circuits .710 Power Factor Requirements .811 Ground Fuse (Link) Requirements .812 Recovery Voltage 913 Short Circuit Test at r .914 Short Circuit Test at Iq .1015 Type 2 Coordi
6、nation Criteria for Evaluation of the Test Results r and Iq 1015.1 General .1015.2 All devices .1015.3 Discrete-type combination motor controllers and starters provided with short circuitprotective devices 1115.4 Type 2 coordination for all devices 1116 Dielectric Voltage-Withstand Tests 1217 Overlo
7、ad Relay Calibration Tests .1318 Discrimination Between Overload Relay and Short Circuit Protective Device (Optional) 1318.1 General .1318.2 Condition for the test .1318.3 Test currents and test circuits 1318.4 Test procedure .1418.5 Results to be obtained 14NOVEMBER 15, 2006 SUBJECT 508E 3UL COPYRI
8、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 The requirements in this Outline of Investigation are for verification of short-circuit tests to beconducted on Type 2 coordinated electromechanical motor controllers as defined by
9、and in accordancewith the Standard for Low Voltage Switchgear and Controlgear, Part 4: Contactors and Motor-Starters,International Electrotechnical Commission (IEC) Publication 947-4-1.1.2 These requirements cover electromechanical motor controllers, such as manually or magneticallyoperated contacto
10、rs with or without thermal or solid state overload relays, combination motor controllerswith discrete components, and starters that are provided with short circuit protective devices, that havebeen investigated for compliance with the requirements in the Standard for Industrial Control Equipment,UL
11、508, and where the main contact voltage rating does not exceed 1000 V ac or 1500 V dc.1.3 The requirements in this Outline of Investigation are applicable only to those specific motor controllersand short circuit protective devices (SCPD) which have been coordinated together by the manufacturer.2 No
12、rmative References2.1 These requirements are based upon the Standard for Low Voltage Switchgear and Controlgear, Part4: Contactors and Motor-Starters, IEC Publication 947-4-1.2.2 Prior to conducting the verification tests, the manufacturer shall provide for review Type 2coordination charts (that is
13、coordination of the motor controller, thermal overload relay, and short circuitprotective device). When the optional tests detailed in Discrimination Between Overload Relay and ShortCircuit Protective Devices, Section 18, are also to be conducted, graphs showing the crossover point ofthe mean curves
14、 representing the time-current characteristics of the overload relays and the short circuitprotective devices shall be provided.3 Definitions3.1 For the purpose of this Outline of Investigation, the following definitions apply. The definitions includedin 3.9 3.11, 3.13, and 3.16 are from IEC 947-1,
15、Standard for Low Voltage Switchgear and Controlgear,Part 1: General Rules.3.2 CONTACTOR An electromechanical device rated in horsepower, full load-locked rotor current(FLA LRA), or both, capable of repeatedly interrupting a motor load under normal conditions includingoverload conditions.3.3 CO SHOT
16、(CLOSING) Closing the contacts of the contactor or circuit breaker on the shortcircuit fault. The contactor or circuit breaker is in the open position prior to the initiation of the fault. Thiscondition is accomplished by the external switch (the fixed switch of the test station) being closed during
17、the closing of the contactor or circuit breaker.3.4 DISCRIMINATION BETWEEN OVERLOAD RELAY AND SHORT CIRCUIT PROTECTIVE DEVICE Verification of the performance of the thermal overload relays of the starters and associated shortcircuit protective devices (SCPD) at currents below and above the intersect
18、ion of their respective time/current characteristics and the corresponding Type 2 coordination.NOVEMBER 15, 2006SUBJECT 508E4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3.5 IP2X An enclosure which is protected against solid foreign objects
19、 of 12.5 mm (0.50 inch) orgreater in diameter as determined by the use of an object probe having a diameter of 12.5 mm and arounded spherical end. The object probe shall not penetrate the enclosure when pushed through anyopening in the enclosure with a force of 30 N 10 percent (6.74 lbf).3.6 Iq The
20、high capacity short circuit fault current assigned by the manufacturer (in IEC terminology,rated conditional short circuit current). Any short circuit fault current assigned by the manufacturer thatexceeds r is denoted as Iq.3.7 MOTOR CONTROLLER A contactor or starter.3.8 O SHOT (WITHSTAND) Closing
21、the short circuit fault on the contactor. The contactor is in theclosed position prior to the initiation of the fault. This condition is accomplished by the use of theexternal switch (the fixed switch of the test station).3.9 POWER-FREQUENCY RECOVERY VOLTAGE The recovery voltage after the transient
22、voltagephenomena have subsided.3.10 PROSPECTIVE CURRENT The current which flows in the circuit when each pole of thecontroller or fuse is replaced by a conductor of negligible impedance.3.11 PROSPECTIVE PEAK MAKING CURRENT The peak value of the prospective current wheninitiated under specified condi
23、tions. (Equivalent to peak value of fault current).3.12 r The standard short circuit fault current (in IEC terminology, Prospective Current)corresponding to the motor full load ampere rating (in IEC terminology, rated operational current).3.13 RECOVERY VOLTAGE For a single-pole service, the voltage
24、which appears across theterminals of a pole of a switching device or a fuse after the breaking of the current. This voltage is to bemeasured at one time or in two successive intervals of time, one during which a transient voltage exists,followed by a second one during which the power-frequency volta
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