UL 1004-7:2018 pdf free download Electronically Protected Motors
3.4 LOW-POWER POINT – A point closest to the supply source in an electronic circuit where themaximum available power to an external load at the end of 5 seconds does not exceed 15 watts.
Adapted by UL from IEC 60335-1Ed.5.1 b:2013 with permission of the American National Standards Institute (ANSI) on behalf ofthe international Electrotechnical Commission. All rights reserved.
3.5 PROTECTIVE ELECTRONIC CIRCUIT (PEC) – An electronic circuit that prevents a hazardoussituation under abnormal operating conditions.
Adapted by UL from IEC 60335-1Ed.5.1 b:2013 with permission of the American National Standards Institute (ANSI)on behalf ofthe International Electrotechnical Commission. All rights reserved.
3.6 PROTECTION SCHEME – A combination of sensing and control circuits.Examples include thefollowing:
a) A combination of rotation sensing (i.e., Hall effect sensor) and a control circuit designed totake corrective action (i.e., deenergize the motor in the event that the Hall effect sensor sensesa lack of intended motor speed);
b) A combination of current sensing and a control circuit designed to take corrective action inthe event that excessive motor current is detected.
Electronic protection circuits may incorporate one or many protection schemes to provide primary orredundant overheating protection for a motor.
4 Application of Requirements
4.1 The protection scheme or schemes relied upon to provide freedom from motor overheating due to thecauses described in 6.5(a) -(c) shall be identified and then validated through test and evaluation toeither:
a) The Standard for Automatic Electrical Controls – Part 1:General Requirements, UL 60730-1;or
b) The UL 60335-1 based requirements in Sections 9 -17.
4.2 Protection scheme(s) provided but not relied upon to provide freedom from motor overheating shallbe disabled during evaluation and testing of the scheme(s) described in 4.1.
4.3 The circuitry associated with those scheme(s) described in 4.2, that are not relied upon to providefreedom from motor overheating, shall only be evaluated as operating circuits not as protective circuits.
5 Spacings
5.1 Spacings at an electronic protector terminal intended to be used as a field-wiring terminal shall not beless than those specified in Table 18.1 or Table 18.2 of UL 1004-1, as appropriate.
5.2 The adequacy of spacings shall reflect the actual levels of voltage involved,which in the case ofelectronically protected motors may be significantly greater or less than the nominal power line voltage.PERFORMANCE
6 Application of UL 60730-1 to Controls used to Provide Overtemperature Protection for Motors
6.1 With reference to 2.1,all performance testing required by the Standard for Automatic ElectricalControls – Part 1: General Requirements, UL 60730-1, on the control is to be performed with the controlconnected as intended to the motor.
6.2 Any test conducted on the control that does not result in an obvious inabiity of the motor to operateas intended,characterized by a cessation of rotation，shall not result in a temperature of the motorwindings in excess of the values specified in Table 32.1 of UL 1004-1.Cessation of rotation is consideredto be independent of an inability to start.
6.3 Any test conducted on the control that results in an obvious inability of the motor to operate asintended, characterized by a cessation of rotation, shall not result in a temperature of the motor windingsin excess of the values specified in Table 8.1 of UL 1004-3.Cessation of rotation is considered to beindependent of an inability to start.
Exception: Any test conducted on the control used within a motor intended for field installation shall notresult in a temperature of the motor windings in excess of the values specified in Table 32.1 of UL 1004-1.
6.4 Any abnormal test conducted on the electronic protection circuit that terminates as a result of acomponent failure, that failure mode shall be evaluated in a manner consistent with the requirements ofUL 60730-1 to ensure that the result is reliable and consistent.
6.5 Controls evaluated to provide required motor overtemperature protection shall provide the followingrequired safety functions when evaluated to the requirements of UL 60730-1:
a) Locked rotor protection -The control shall not allow motor temperatures in excess of theapplicable values specified in Table 8.1 of UL 1004-3 under any test condition required by UL60730-1.
UL 1004-7:2018 pdf free download
