Patent ID: 6422350
Filing Date: 2002-07-23
Classification: B66B

Abstract:
An apparatus for monitoring elevator drive equipment, the drive equipment including a switching device having an input for connection to a plural phase alternating current power source, an elevator drive motor and a power supply unit connected between the switching device and the drive motor for providing electrical power to the drive motor, comprising:a monitoring means for sensing a condition representing current flow in an output of a switching device and in an input of a power supply unit connected to the switching device output; and an input side control having an input for receiving said monitoring signals generated by said monitoring means, and having an output for generating switching-off signals when an elevator drive motor connected to the power supply unit is in a standstill condition whereby when said output of said input side control is connected to the switching device, the switching device responds to said switching-off signals by disconnecting the switching device from the power supply unit.