Method and apparatus for controlling a system of compressors to

Details Method and apparatus for controlling a system of compressors to Method and apparatus for controlling a system of compressors to

1992-10-13

1994-08-30

Smith, Jerry

Boots, shoes, and leggings

364510, 62157, 417 8, G05B 1500, G05D 2332, F04B 4106

Patent

active

053433840

ABSTRACT:
Load sharing is achieved in a multiple compressor system by a program in a computer which sends signals to, and receives data from, a microcontroller located at each compressor. One compressor, designated as the lead compressor, furnishes its operating parameters, via the computer, to all the other, lag, compressors. The operating parameters include inlet valve position and bypass valve position of each compressor and the microcontroller controls the actuatation of both valves. When system demand decreases, compressors are gradually unloaded, and then stopped to go off-line. When system demands increase, compressors are first started, and then gradually loaded before going on-line. Compressors go both on-line and off-line subject to certain time delays so that compressors are gradually added to, or shed from, the load. To equalize running time, all compressors in the system may undergo a periodic rotation and compressors go off-line in reverse order that they came on-line.

REFERENCES:
patent: 4152902 (1989-05-01), Lush
patent: 4384462 (1983-05-01), Overman et al.
patent: 4502842 (1985-03-01), Currier et al.
patent: 4580947 (1986-04-01), Shibata et al.
patent: 5123256 (1992-06-01), Oltman
patent: 5231846 (1993-08-01), Goshaw et al.
Instruction and Installation Manual for the Ingersoll Rand Two to Eight Compressor Control Software 1X13132, dated Sep. 6, 1990.

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