초록 ▼

An air regulator system for a powder coating system and method of operating the system whereby air regulators constructed with inexpensive, on-off servo control valves are positioned side by side and secured to a common bracket and are operated with a pulse width modulating circuitry that quickly an

An air regulator system for a powder coating system and method of operating the system whereby air regulators constructed with inexpensive, on-off servo control valves are positioned side by side and secured to a common bracket and are operated with a pulse width modulating circuitry that quickly and accurately controls the regulator. The circuitry is carried on a circuit board which is also mounted to the common bracket.

대표청구항 ▼

A method of controlling an on-off vent valve and an on-off fill valve of an electrically controlled air regulator, comprising the steps of: generating a reference signal corresponding to a desired pressure in an outlet pressure port of said air regulator; generating a feedback signal in response to

A method of controlling an on-off vent valve and an on-off fill valve of an electrically controlled air regulator, comprising the steps of: generating a reference signal corresponding to a desired pressure in an outlet pressure port of said air regulator; generating a feedback signal in response to the pressure in said outlet pressure port of said air regulator, said feedback signal having an envelope with a lower value corresponding to a vent trigger threshold value, and an upper value corresponding to a fill trigger threshold value; comparing said feedback signal with said reference signal for outputting a vent trigger signal to open said on-off vent valve whenever said reference signal is below said vent trigger threshold value; comparing said feedback signal with said reference signal for outputting a fill trigger signal to open said on-off fill valve whenever said reference signal is above said fill trigger threshold value; and pulsing at least one of said fill trigger and said vent trigger signals whenever said feedback signal approaches said reference signal. An electrically controlled air regulator to operate at least one air operated device, comprising: a pressure regulator having an inlet supply port connected to a source of pressurized air, an outlet pressure port connected to said air operated mechanism, and means for regulating the flow of pressure regulated air from said inlet supply port to said outlet pressure port comprising piston means for opening and closing a regulator valve to control the flow of said pressure regulated air at said outlet pressure port; a solenoid on-off fill valve connected to a source of pressurized control air for moving said piston means to open said regulator valve and increase the pressure of said pressure regulated air at said outlet pressure port; a solenoid on-off vent valve for moving said piston means to close said regulator valve and decrease the pressure of said pressure regulated air at said outlet pressure port; transducer means for generating a feedback signal proportional to the pressure in said outlet pressure port; means for providing a reference signal corresponding to a desired pressure at said outlet pressure port; circuit control means outputting fill and vent trigger signals to said solenoid on-off fill valve and said solenoid on-off vent valve, respectively, in response to said means for providing a reference signal and said means for generating a feedback signal for opening and closing said solenoid on-off vent valve and said solenoid on-off fill valve, respectively, said circuit control means including: an oscillator for pulsing at least one of said fill trigger and said vent trigger signals whenever said feedback signal approaches said reference signal; and pulse width modulating means for reducing the duration of said pulsing of said at least one of said vent trigger and fill trigger signals as said feedback signal moves closer to said reference signal.