Method of operating a transport refrigeration unit

Details Method of operating a transport refrigeration unit Method of operating a transport refrigeration unit

1991-07-11

1992-08-25

Wayner, William E.

Refrigeration

Processes

Circulating external gas

62127, 324503, G01R 3100, F25B 4900

Patent

active

051408252

ABSTRACT:
A method of automatically checking components and associated wiring of electrical control associated with a microprocessor controlled transport refrigeration system. The transport refrigeration system has a prime mover which drives a refrigerant compressor and an alternator. The control includes a battery and a current shunt which measures battery current. During the automatic checking procedure, the prime mover is off, to provide a zero alternator output. Upper and lower battery current draw limits are provided for each component to be checked. Each of the components to be checked is energized and de-energized, with the microprocessor individually and successively connecting each component to, and disconnecting it from, the battery. The microprocessor compares the battery current draw of each component, when energized, with the associated battery current draw limits. An alarm is provided when a battery current draw is outside the associated draw limits, with the alarm identifying the associated component.

REFERENCES:
patent: 4207611 (1980-06-01), Gordon
patent: 4617510 (1980-10-01), Deicke et al.
patent: 4663725 (1987-05-01), Truckenbrod
patent: 4725959 (1988-06-01), Matsumoto
patent: 4884033 (1989-11-01), McConchie, Sr.
patent: 4918932 (1990-04-01), Gustafson et al.

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