An absolute position-feedback (APF) linear-displacement transducer built into linear actuators gets rid of the need for homing routines at power up or power loss.
Instead, the transducer sends analog feedback to the controller or PLC telling it the exact position of the load. The device also detects work-point variances throughout the cycle, so there’s no need to stop for manual setups. APF measures position directly, eliminating the effects of screw or nut backlash from positional feedback data. The APF option is currently available on BC3 Pneumatic and B3S Electric Series actuators from Tol-O-Matic, Hamel, Minn. (www.tolomatic.com). Unlike fixed-length sensors, APF can be configured in incremental stroke lengths from 2 to 156 in.