Solid state compressor control system

Pumps – With signal – indicator – or inspection means

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Details

417282, 417310, F04B 4902

Patent

active

043360017

ABSTRACT:
A solid state system for controlling a compressor or pump which is driven by a motor, the compressor being loaded or unloaded manually or automatically and proportionally to maintain a selected suction-pressure setpoint and to maintain the load on the drive motor within a motor-current setpoint limit, the system having start-up and shut-down sequences which have timed stages including a delay to permit the building up of oil pressure prior to loading of the compressor and including the automatic loading and unloading of the compressor incident to start-up and shut-down. The control includes monitoring of temperatures and pressures associated with the system and automatic shut-down in response to malfunctions internal to the system, and includes automatic shut-down in response to external malfunctions as selectable options, and further includes separate malfunction indicators with a circuit for providing their operability.

REFERENCES:
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patent: 3535053 (1970-10-01), Jednacz
patent: 3536451 (1970-10-01), Ludwin
patent: 3743442 (1973-07-01), Wilson
patent: 3924972 (1975-12-01), Szymaszek
patent: 4147475 (1979-04-01), Shoop et al.
patent: 4249866 (1981-02-01), Shaw et al.
patent: 4254370 (1981-03-01), Miller

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