Diagnosis: Troubleshooting, Status Messages, Alarm Codes - Thermo King MAGNUM Maintenance Manual

Diagnosis: Troubleshooting, Status
Messages, Alarm Codes
Introduction
This chapter includes the following:
• Introduction to Controller Diagnostics
• Troubleshooting charts
• Status Messages chart
• Alarm Codes chart
The charts will help you identify and fix unit
problems.
Controller Diagnostics
The MP3000a can be a very helpful diagnostic
tool.
The following menu areas of the MP3000a
controller menu will help you diagnose problems
occurring with the Magnum unit.
The Alarm List menu displays
Alarms Menu:
alarm codes. Alarm codes are recorded in the
controller memory to simplify unit diagnosis
procedures. Some alarm codes are only recorded
during a pretrip (PTI) test or function test. Fault
codes are retained by the controller in a
non-volatile memory. Refer to the Alarms Menu
in the Operating Instructions Section.
The MP-3000a controller contains
Brief PTI Test:
a special Brief PTI pretrip test that automatically
checks unit refrigeration capacity, heating
capacity, temperature control, and individual
components including the controller display,
contactors, fans, protection devices and sensors.
The test includes measurement of component
power consumption and compares test results to
expected values. The test takes about 25-30
minutes to complete, depending on the container
and ambient temperature. Refer to the Brief PTI
Test in the Operating Instructions Section.
The MP-3000a controller contains a
Full PTI Test:
special Full PTI pretrip test that automatically
checks unit refrigeration capacity, heating
capacity, temperature control, and individual
components including the controller display,
contactors, fans, protection devices and sensors.
The test includes measurement of component
power consumption and compares test results to
expected values. The test takes up to 2 to 2.5
hours to complete, depending on the container and
ambient temperature. Refer to the Full PTI Test
Menu in the Operating Instructions Section.
The MP-3000a controller contains
Functions Test:
a special function test that automatically tests
individual components including the controller
display, sensors, condenser fan, evaporator fan,
compressors, etc. The test includes measurement
of component power consumption and compares
test results to expected values. Refer to the
Functions Test Menu in the Operating Instructions
Section.
The Manual Function Test
Manual Functions Test:
menu allows technicians to perform specific
diagnostic tests on individual components or turn
several components on at the same time to
perform a system test. Refer to the Manual
Functions Test Menu in the Operating Instructions
Section.
The Data menu displays general unit
Data:
operating information including sensor
temperatures, unit electrical data, etc. Refer to the
Data Menu in the Operating Instructions Section.
155