| 摘要 |
PURPOSE:To make it possible to increase the number of a safety device without the increase of a cable by identifiably outputting and displaying the action of various safety devices provided in an electric apparatus of a manned conveyer etc., to a failure display circuit with one cable. CONSTITUTION:When any one of plural safety device contacts SA-SD is actuat ed during a manned conveyor operation, the self-retention of an ascent or descent coil Ux or Dx is cancelled by the OFF of the contact, main contactors U1-U3 and D1-D3 is opened, and a motor 2 is stopped. Consequently the con tact is switched to corresponding detection resistors R1-R4 sides, the voltage level signal of the ratio between the resistant value of the resistors R1-R4 and that of a damper resistor Rd enters in a failure display circuit 3, identified with a voltage detector 3a, and the defective action display data of a correspond ing safety device is read out from a memory part 3c via an A-D converter 3b to be displayed on a display unit 3d. Thus the number of a safety device can be increased without the increase of a cable. |
