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Electrical-shock Prevention. Volume III -fault Protection for Motion-drive Equipment.
Morley-LA; Trutt-FC; Buchan-GM
NTIS: PB/84-102961 :65 pages
This report examines the indication versus interruption procedures used on motion-drive power equipment with emphasis on surface excavators. A review of the electromechanical ac-dc conversion used with the control system is presented. Protection for the drive- system components are discussed. Fault sources and calculations for both the ac supply source and DC power loop are introduced to assist in discussing indication and interruption procedures. The dynamic process of the machine is examined and the effects of fault current and position of the machine to allow for an orderly shutdown is determined. Possible indication and interruption procedures are given to the four-quadrant duty cycle of excavators. The report is concluded by introducing other mining operations that utilize similar motion-drive systems and static (solid-state) drives and recommends further research in these areas, as well as a more detailed examination of the dynamic fault analysis for excavators.
CP; Final Contract Report;
NTIS Accession No.
Pennsylvania State Univ.
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division