The VNW transducer combines the robust and versatile design of DFE's time-proven Model C shaft-end transducers with a choice of mounting styles and wheel options from the RFA -style cantilevered transducers. DFE has kept the quality of the VNW transducer high while offering it at a highly competitive base price.
A VNW transducer is cantilever-mounted on process machinery for unwind, payoff, rewind, take-up, or intermediate zone applications. Tension is measured by high-output silicon strain gages housed internally on a dual cantilevered transducer beam and connected in a wheatstone bridge configuration. As the ribbon or filament passes over the rotating transport wheel, the force of the substrate on the wheel shaft causes a minute deflection of the transducer beam. The resulting change in strain gage resistance yields a voltage output from the transducer that is proportional to tension. The transducer output is then amplified by a DFE indicator or automatic controller for tension measurement or complete closed-loop tension control.
The VNW transducer's standard configuration has an aluminum beam with a stainless steel housing and shaft holder. The five mounting styles offered are single bolt (with an alternative to face-mount the transducer on the opposite side of the machine frame using a bolt pattern on the transducer front), flange, pillow block, piloted flange, or through-frame.
All wheels are optional accessories; no wheel is provided as standard since many customers prefer to supply their own shafts and wheels. Wheels are shaft-mounted with the shaft inserted into the transducer's face coupling and secured by set screws. The shaft insertion depth can be adjusted (+/- 0.25 inch) for proper alignment of the wheel with the web. On the standard unit the electrical connector is positioned at 6 o'clock (same as the tension force direction).