Thermo King 098203, Maintenance Manual

Page: 139 / 264

Operating Theory
137
Figure 107: Details of CT Log
Trip Action and Unit Mode
• Container is prepared with CT settings and transported to be loaded. If the unit is running the
container will pre-cooled.
• If unit is equipped with the UDSA sensors, once all the sensor temperature readings deceases to or
below the USDA Max the CT period will start.
• Cargo is loaded and USDA sensors are placed in the cargo per the USDA specification.
• USDA sensor readings will increase to cargo temperature and a running CT period will be
canceled. Pull down of the cargo temperature begins
• Once all the USDA sensor temperature readings decease to or below the USDA Max the real CT
period will start.
• If any of the USDA sensor temperature readings go above the USDA Max, the CT period will be
canceled and the above action will repeat.
• When the specified number of days has finished the controlling setpoint is increase, 0.1 C per
hour, until the final setpoint is reached.
During the CT a set of events and temperature readings are logged in the datalogger.
2005/04/27 11:33 KBD Cold Treatment Activity - Option made possible - not yet activated.
2005/04/27 11:33 KBD Cold Treatment Activity - C/t set point 0.0C.
2005/04/27 11:33 KBD Cold Treatment Activity - Period/Days 3days.
2005/04/27 11:34 KBD Cold Treatment Activity - USDA max 3.0C.
2005/04/27 11:34 KBD Cold Treatment Activity - Final set point 5.0C.
2005/04/27 11:39 KBD Cold Treatment Activity - DE-ACTIVATED/STOPPED before time.
2005/05/03 10:30 KBD Cold Treatment Activity - ACTIVATED.
2005/05/03 10:30 AUTO Cold Treatment Activity - Initiated. C/t SP:1.0C - USDA max:3.0C - Period:3days - Final SP:5.0C.
2005/05/03 13:32 AUTO Cold Treatment Activity - Period started. C/t SP:1.0C - USDA max:3.0C - Period:3days.
2005/05/04 14:31 AUTO Cold Treatment Activity - Period started. C/t SP:1.0C - USDA max:3.0C - Period:3days.
2005/05/07 15:00 AUTO Cold Treatment Activity - Period passed OK.
2005/05/08 10:30 AUTO Cold Treatment Activity - Ended. Final SP:5.0C.
Commodity
is loaded
Pulling down
C/T Period started
Warm up
C/T Period
Maintaining C/T Set point
Final set point
reached
Commodity
is unloaded
Maintaining
final set point
Pre-cool
USDA MAX
temperature
C/T period
Passed
$5$