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Dual-Drive Stacker Applications

Application

Conveyor with two shaft-mount drives on the systems

Issue

Reduced output, motor reliability

Description

With traditional dual-drive systems (i.e., same sheave sizes on both sides), like components can have enough variation to cause uneven load sharing between the motors.

In one such case, a plant superintendent was unable to optimize FPM output due to conveyor shock loads, resulting in unequal motor load sharing and amp spikes. This necessitated slowing the conveyor speed to 82% in order to accommodate load spikes and avoid motor damage. As a result, output from this particular part of the plant suffered.

Solution

Browning® MVP® sheave and companion on motor #1 (3MV5V97R and 3MVP815V95Q with corresponding bushings). Motor #2 was left unchanged with its 35V1090SF and 35V975SF sheaves.

Result

With the MVP sheaves installed, the operator was able to balance the shock load between the two motors, better controlling the amp draw and eliminating motor damage. Conveyor speed was increased with a corresponding improvement in output. Additionally, the plant avoided a 133 percent premium by not having to install variable speed inverters.