Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1978-09-19
1980-10-14
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 13, 417 18, 417 19, F04B 4906, F04B 4902, F04B 4910
Patent
active
042278627
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 shutdown in response to external malfunctions as selectable options, and further includes separate malfunction indicators with a circuit for providing their operability.
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Andrew Eduardo V.
Armstrong, Jr. Richard C.
Naunas, Jr. Robert A.
Freeh William L.
Frick Company
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