CORRECTION DEVICE OF ARRIVAL PRECISION IN ELEVATOR SYSTEM WITH GENERAL MOTOR AND INVERTOR OF VARIABLE VOLTAGE VARIABLE FREQUENCY METHOD

摘要

In an accuracy correction device for a VVVF type elevator an up switch (UP) and a down switch (DN) are parallelly connected to each other between input terminals (3,5), which are connected to a common terminal (COM) of an inverter via a relay (L30) and a relay (L70) respectively. The L30 is to be "on" if the charge is 30 % or less, and the L70 is to be "on" if the charge is 70 % or more. The input terminal (4) is directly connected to the common terminal.