METHOD AND APPARATUS FOR CONTROLLING A BUCKET HOIST

摘要

A control system for a bucket hoist includes a two-axis master switch configured to generate a first and a second command signal responsive to motion along each axis. Each command signal is provided to one of a pair of motor controllers configured to control one of a pair of motors. The two motors are controlled to raise/lower and open/close the load handling member. When the two-axis master switch is moved to the close position, the closing motor controller is commanded to control its respective motor to begin closing the load handling member. The holding motor controller is configured to generate a current to its respective motor to generate torque at a predefined level. The predefined level of torque is selected such that the load handling member lowers into the material in which it is digging as it is being closed.

主权项

1. A control system for a hoist having a load handling member controlled by a closing motor and a holding motor, the control system comprising:
a two-axis master switch configured to generate a first command signal responsive to motion of the master switch in a first axis and to generate a second command signal responsive to motion of the master switch in a second axis; a first motor controller configured to rotate the closing motor in one of a raising direction and a lowering direction responsive to the first command signal, wherein the first motor controller includes an output configured to transmit a signal corresponding to the closing motor rotating in the raising direction; and a second motor controller including an input electrically connected to the output of the first motor controller, wherein the second motor controller is configured to rotate the holding motor in one of a raising direction and a lowering direction responsive to the second command signal and is further configured to output a current to generate a predefined torque in the holding motor responsive to the signal corresponding to the closing motor rotating in the raising direction received at the input.