Experimental research of the application of turning method in the non manipulative reverse protection of VVVF escalator

Abstract

Of escalators and moving sidewalks manipulation reversal protection device, the regular inspection and test is a standard, safety technical norms and requirements, is the important way to verify its validity function. Barring method applied in the field of frequency conversion of escalators and moving sidewalks reversal protection device for validation test, need to interrupt the motor running, because some automatic frequency conversion electric control system of escalators and moving sidewalks and protection function of frequency converter, cause in the process of test control system will automatically stop the escalator running, thus make barring method test cannot continue. Based on the analysis of frequency conversion control principle, design of ac electronic load circuit, to replace the inverter output load motor way, without changing and adjusting the original escalator and frequency converter control system, under the condition of on-site test is an effective method. Results show that using ac electronic load circuit, parts for frequency conversion escalators and moving sidewalks manipulation reversal protection device, technical measures for barring method test is feasible and solves the part of detection frequency escalators and moving sidewalks than manipulation reversal protection device, in stop problems in application of barring method test.