Communications: electrical – Systems – Call station
Patent
1975-09-12
1977-01-11
Swann, III, Glen R.
Communications: electrical
Systems
Call station
324161, 324167, 340263, 340267R, G08B 2100
Patent
active
040030466
ABSTRACT:
A system for monitoring the operation of a plurality of rotating-shaft machines, including a switchable meter to indicate the shaft speed of any one of these machines. Each machine has a monitoring circuit including respective visual warning branch circuits to indicate if the machine shaft falls below a first preset speed and then to indicate if the machine shaft falls below a second preset speed, with provision for sounding an audible alarm. The system has a single power supply, switchable meter, audible alarm control circuit and warning reset circuit, and identical monitor modules for the respective machines to be monitored. Each module has an external sensor, consisting of a pickup coil and a magnet assembly attached to the rotating shaft of the monitored machine; a high-gain integrated circuit amplifier to amplify the pulses from the sensor; circuitry to convert the pulses to a D.C. voltage proportional to shaft speed; visual warning and alarm lamps; a switch to connect the audible alarm to the module or optionally to disconnect it; separate high-gain integrated circuit amplifiers to control the indicating meter, visual warning, and visual/audible alarm; and multi-turn potentiometers, accessible from a common front panel to control sensitivity, speed range, meter circuit gain, and set points in percent of normal speed for the warning and alarm circuits.
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patent: 3527928 (1970-09-01), Ryder et al.
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patent: 3611343 (1971-10-01), Schoenbach
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patent: 3913085 (1975-10-01), Farstad
patent: 3918037 (1975-11-01), Hall
Jordan Robert E.
Miller Lloyd D.
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