The changeover frame comprises of two sets of independent rollers.
The function of the first set is to be in-service or duty rollers which are orientated in the vertical position i.e. frame perpendicular to the conveyor belt.
The second set of rollers, are stand-by rollers which are inclined by 75 degrees to the vertical and provide 100% redundancy for a failed set of duty rollers. In the event of duty roller failure, the standby rollers are brought into service by the rotation of the changeover frame by the electrically operated drive mechanism.
The changeover frame drive mechanism is controlled by the operator/maintainer via an ultra-low voltage handheld controller. The controller interfaces with the drive mechanism via a locally connected control cable. The actuation of the changeover frame can then be performed at a safe distance from the conveying operations. Alternatively, permanent low voltage power supply could be installed.