INSTRUMENT_SERVO_CYCLING

Published:2009/7/24 1:32:00 Author:Jessie | From:SeekIC

Used to cycle instrument servo units from stop to stop for extended periods of time, as for determining wear characteristics and friction level changes. Motor drive is applied so servo pot arm is driven toward +30 v. When 27-V breakdown of D1 is exceeded, it conducts and turns on 1; K1 pulls in, energizing K3, and motor drive reverses. As pot arm approaches -30 V, reversing action occurs again.-P. J. Stein, Instrument Servo Cycling Circuit, EEE, 12:9, p 61.



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