CPC G05B 19/416 (2013.01) [B64C 39/024 (2013.01); B64D 1/22 (2013.01); B66D 1/505 (2013.01); B64U 2101/60 (2023.01); B66C 13/22 (2013.01); B66C 23/202 (2013.01); G05B 2219/41318 (2013.01)] | 16 Claims |
1. A control device configured to control an electric hoisting machine configured to wind and/or unwind a traction member on or from a rotating body by rotating the rotating body forward and backward by way of the forward and backward rotation drive of an electric motor, the control device comprising:
a tension detection part configured to detect a tension of the traction member;
an input part configured to input a mode switching signal to switch between a winding mode to rotate the rotating body forward to wind the traction member on the rotating body and a unwinding mode to rotate the rotating body backward to unwind the traction member from the rotating body; and
a control unit configured to receive a detection signal from the tension detection part and a mode switching signal from the input part and control the operation of the electric motor in response to the mode switching signal,
wherein the control unit is configured to control the electric motor in response to a detection signal from the tension detection part so that when set to the unwinding mode by the mode switching signal,
the rotating body is rotated backward when the tension of the traction member is equal to or greater than a predetermined threshold value, and
the rotating body is prevented from being rotated backward when the tension of the traction member falls below the predetermined threshold value,
wherein the control unit is configured to limit a speed of the backward rotation of the rotating body to a predetermined speed or less in the unwinding mode.
|