PLUGGING THE MOTION

The swing drive is torque controlled. This means that the further the controller is moved, the more torque the swing drive will develop, thus increasing the machine’s swing-acceleration rate. Full swing speed is obtained at any position of the controller. THIS CONTROL SHOULD NOT BE “JOCKEYED” DURING OPERATION.

PLUGGING THE MOTION

PLUGGING machinery motion is the use of motor torque, applied in the opposite direction of motor rotation, to slow or stop the motion. This process is recommended only on the swing motion on this machine. Plugging is accomplished when the operator positions the controller to swing the machine in the opposite direction of the current machine rotation. As the machine slows to a stop, the amount of plugging effort is gradually reduced to provide a smooth stop. Continued plugging effort will reverse the direction of the motion. Plugging rapidly dissipates the energy of heavy moving parts by regenerating into the power source. When the hoist or drag controllers are returned to neutral with the machinery in motion, the motions automatically plug to slow the machinery. Only a small amount of plugging is required for the hoist and drag motions.