Method of operating a transport refrigeration unit
First Claim
1. A method of operating a transport refrigeration unit having electrical control which includes a display, comprising the steps of:
- detecting the occurrence of predetermined events in the transport refrigeration unit,classifying at least certain of the predetermined events into at least first, second and third categories of unit fault conditions,shutting the unit down when a first category fault condition occurs,flashing a visual alarm indicator when a first category fault condition occurs,identifying the nature of a first category fault condition at the time of occurrence,energizing a visual alarm indicator continuously when a second category fault condition occurs,identifying the nature of a second category fault condition at the time of occurrence,storing a third category fault condition at the time of occurrence, anddisplaying all stored third category fault conditions for a predetermined period of time in response to a predetermined event.
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Abstract
A method of operating a transport refrigeration unit having electrical control which includes a display, including the steps of detecting the occurrence of predetermined events in the transport refrigeration unit, and classifying at least certain of them into first, second and third categories of fault conditions, and into a fourth category related to maintenance associated events. When a first category fault occurs, the unit is shut down, a visual alarm is flashed, and the nature of the fault is immediately identified. When a second category fault occurs, a visual alarm is steadily energized, and the nature of the fault if immediately identified. When third category faults and fourth category events occur, they are stored and periodically displayed, with the display respectively identifying the nature of the fault and the type of maintenance event.
94 Citations
7 Claims
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1. A method of operating a transport refrigeration unit having electrical control which includes a display, comprising the steps of:
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detecting the occurrence of predetermined events in the transport refrigeration unit, classifying at least certain of the predetermined events into at least first, second and third categories of unit fault conditions, shutting the unit down when a first category fault condition occurs, flashing a visual alarm indicator when a first category fault condition occurs, identifying the nature of a first category fault condition at the time of occurrence, energizing a visual alarm indicator continuously when a second category fault condition occurs, identifying the nature of a second category fault condition at the time of occurrence, storing a third category fault condition at the time of occurrence, and displaying all stored third category fault conditions for a predetermined period of time in response to a predetermined event. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification