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EIGHT_TONE_CRANE_MOTOR_CONTROL

2016-09-04 03:33  
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EIGHT_TONE_CRANE_MOTOR_CONTROL
Eight preset frequencies or tones activate collector relays that operate crane motor contactors. Sequence of preselected operations, recorded on magnetic tape, is repeated by traveling crane during playback, to give positioning accuracies better than 1/8th inch. Table gives values of R-C network compo nents in grid circuit of phase-shift oscillator to provide the eight tones.-G. V. Sadler, Taped Tones Control Overhead Crane, Electronics, 31:1, p 63-65.