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PRETRIP (Continued)
If "CAN NOT START PRETRIP" is displayed in
the MessageCenter, check to see if the unit is in
PC Mode (Refer to Section 5.3) or Defrost
mode, or check the alarm list (Section 3.11) for
active shutdown alarms.
NOTE
Pretrip will run until completed, unless an alarm
occurs that causes Pretrip to be aborted. Only
alarms that will result in other erroneous alarms
or will affect future Pretrip tests will abort Pre-
trip.
Pretrip may be stopped by the user by either
turning the unit off then back on again, or by
pressing and holding the = key for 5 seconds.
"PRETRIP STOPPED BY USER" will display in
the MessageCenter.
Once Pretrip is started: If the unit is running, the micro-
processor will shut the unit down.
NOTE
Before completing Pretrip, the microprocessor
looks at the status of alarms and if certain
alarms are active (for example: Low Fuel Warn-
ing, Check Engine Oil Level, Check Coolant
Level, Check Coolant Temperature, Pretrip will
display "FAILED", indicating that the unit is not
ready to be sent out for a load, but that the alarm
list should be checked and all present alarm si-
tuations corrected.
It is always a good idea to clear all alarms from
both Alarm Lists before starting Pretrip. The
technician will then know that any alarms pres-
ent following Pretrip occurred during Pretrip,
and are not old alarms that had not been
cleared.
NOTE
The operator MUST be present and validate
Test 1 by watching the microprocessor display.
The microprocessor will illuminate all the Mode
Lights and all segments of the Main Display.
Following Test 1, the operator MUST verify that,
during the first 5 seconds of Test 2, the buzzer is
energized.
62-11389
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Test 1 - Display Test
The microprocessor activates the display, and both
lights on the Light Bar. This test will last 5 seconds. All
segments of the display, all LEDs on the microproces-
sor, both lights of the Light Bar will be on during this test.
This portion of the Pretrip requires that the operator de-
termines PASS or FAIL. A defective display is indicated
if: any LCD/LED segments are not visible or any LEDs
or lights do not illuminate. Anything that fails during this
test should be repaired at the conclusion of the Pretrip
cycle. Pretrip will continue regardless of the outcome of
this test. A faulty display or light bar will not affect the op-
eration of the unit, but will affect what is displayed during
unit operation.
Test 2 - Sound and 12VDC Electrical Component
Amperage Check
At the beginning of this test the microprocessor activ-
ates the buzzer for 5 seconds, the operator is to determ-
ine if the sound test is PASS or FAIL. If the sound test
fails it should be repaired at the conclusion of the Pretrip
cycle. Pretrip will continue regardless of the outcome of
the sound test. A faulty buzzer will not affect the opera-
tion of the unit, but will lead to operation without proper
audible warning on start up.
Test 2 will continue with a check of the amperage (cur-
rent) draw of the following components:
•
Battery DC Current (All Components Turned Off).
•
Front Unloader Solenoid (UL1).
•
Rear Unloader Solenoid (UL2) .
•
Intake Air Heater (IAH).
•
Engine Speed Control Unit (ENSCU).
•
Condenser Motor Contactor (CDCON).
•
Compressor Motor Contactor (CCON).
•
Generator Contactor (GENCON).
•
Standby Contactor (PSCON).
•
Heater Contactor (1HTCON1).
•
Heater Contactor (1HTCON2).
•
Evaporator Motor Contactor (1EVCON).
Each component will be individually checked for proper
current draw. An alarm will be activated for any compo-
nent not drawing amperage in the expected range.
Test 3 - Refrigeration System Equalization Check
With the engine and the unit off, the CSMV will open to
50% and the EVXV will open to 100% so that the pres-
sure in the refrigeration system can equalize.
Test 4 will last approximately 5 seconds. If a problem is
detected with any of the sensors, the corresponding
alarm will be activated.
3−6
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