Industrial +10V Digital Potentiometer motors modern industrial sy

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Industrial +10V Digital Potentiometer motors modern industrial sy

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Application Note 843: 2001
Industrial +10V Digital Potentiometer
motors modern industrial systems often controlled programmable logic controllers (PLCs) located control room safely away from process. operator must motor speed manually while observing process, component choice usually industrial-grade potentiometer, whose wiper produces signal that feeds back motor controller control room. Such potentiometers expensive prone wear. With wear they open control loop, allowing motor speed ramp control. With components, reliable, low-cost, all-surface-mount, solid-state digital potentiometer implemented industrial applications (Figure result direct drop-in replacement wearprone mechanical potentiometer, occupies same space within electrical enclosure. takes power from +10V formerly supplied mechanical from motor controller. solid-state provides similar output, delivers much 15mA controller.
Figure This solid-state industrial potentiometer simulates equivalent mechanical potentiometer, fits same space. this circuit low-power digital potentiometer 100k version (U3). Configured voltage divider, this provides output discrete voltage steps between minimum maximum settings 5V). low-power linear regulator (U1) provides supply rail resistor ladder internal (whose maximum rating +5V). constitute double-pushbutton industrial switch. Each high-to-low transition produced increments digital potentiometer's "wiper" step (depressing while toggling www.maxim-ic.com/an843 Page
decrements wiper step). switch debouncer that provides addition debouncing) 40ms fixed delay between outputs switch action. provide +10V outputs required motor controller, single-supply, rail-to-rail (U4) amplifies output factor two. input common-mode range this amp, (250mV beyond either supply rail), allows generate +10V outputs like mechanical potentiometer. resistors gain 2V/V. circuit's quiescent current ranges from 86µA output 186µA +10V. lower this quiescent current, choose 200k version Because stable capacitive load, easily drives long, shielded, multi-conductor cable runs back control room. Another benefit allsurface-mount solid-state construction important Class enclosures: lower power dissipation produces less heat within electrical enclosure. similar version this article appeared September 2001 issue magazine. DI384, November 2001
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Industrial +10V Digital Potentiometer motors modern industrial sy

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