Proportional-integral process controller having a comparator wit

Details Proportional-integral process controller having a comparator wit Proportional-integral process controller having a comparator wit

1990-09-14

1992-03-24

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318609, 290 40R, H02P 500

Patent

active

050991833

ABSTRACT:
A process controller for maintaining constant pressure under varying flow conditions, including a variable ramp generator and a constant threshold generator which are used to phase-control the current to the pump motor. The process controller can operate over a wide range of incoming AC power line frequencies, and has safety features which drive the motor to its mininum speed in the event of a failure at the setpoint control potentiometer and also disconnect power to the controller if the pressure exceeds a dangerous magnitude.

REFERENCES:
patent: 3892975 (1975-07-01), Yannone et al.
patent: 3939328 (1976-02-01), Davis
patent: 4152758 (1979-05-01), Bailey et al.
patent: 4242592 (1980-12-01), Yannone et al.
patent: 4308463 (1981-12-01), Giras et al.

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