Regeneration with adjustable frequency drives. In these units, sensors measure the dc bus voltage. When it exceeds specific limits, a power circuit connects a resistor across the dc bus to dissipate the excess energy. • Use a lineregenerative AFC or addon regenerative module .
Belt sag. The amount of vertical deflection of a conveyor belt from a straight line between idlers, usually expressed as a percentage of the center to center spacing of the idlers. Belt slip. The speed differential between the belt and the pulley surface, accelerating the abrasion of the belt cover.