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MOTORIZED CABLE REELING DRUM

Quick Overview

Working Principle:

Torque controller type cable reel are driven by a substantially constant speed motive power unit. In its standard form, the reel is designed to be powered by a totally enclosed fan cooled electric motor. The most popular choice is for motors working form a 3 phase supply but single phase or DC motors may also be used provided they have performance characteristic as in accordance with the torque controller data. The motive power unit drives the cable reel through an irreversible worm an wheel transmission which is totally enclosed and lubricated for life. The reduction ratio of this worm and wheel transmission is normally 50:1 and the rotational speed of the transmission out put spindle is adjusted by selection of the motive power speed. In all cases the selected rotational speed of this output spindle is in excess of that required for the cable reel. The speed differential between the transmission output spindle and the cable reel is accommodated by the torque controller using a friction pad as the slipping interface. The irreversible worm and wheel transmission and the stable torque characteristics of the torque controller permit successful cable reeling on the basis of energizing the motor for cable recovery. The benefits of energizing the reel motor for cable recovery only, are increased lining life and extended intervals between torque correction adjustments.

 TC Payout Sensor Operation:

The basic function of the payout sensor is to detect the rotation of the reel ensuring that the reel motor is energised during cable recovery and de-energised during cable payout. A limit switch is operated byaswivelingarm which is rotated by means of a cam fitted to the reel spindle. When the reel revolves in a payout condition the arm is moved until it opens the contacts in the limit switch de-energising the reel motor. In the reel-in condition the arm is rotated away from the limit switch making the contacts energising the reel motor. Since the payout sensor cannot anticipate the direction of rotation of the reel under start conditions, the reel motor is always energised for 30 seconds by the incorporation of a timer in the control circuit which by passes the payout sensor contacts. This timer allows sufficient time for the sensor to detect whether the machine is moving towards the cable anchor position or away from it so ensuring that the reel motor is either energised or de-energised.