Container Refrigeration Operation & Service

T -309
4-3
3. Pre-trip may also be initiated via
communications. Theoperationisthesame
asforthekeypadinitiationdescribedbelow
except that should a test fail, the pre-trip
mode will automatically terminate. When
initiatedviacommunications,atestmaynot
be interrupted with an arrow key, but the
pre-trip mode can be terminated with the
PRE-TRIP key.
a. Press the PRE-TRIP key. This accesses a test selec-
tion menu.
b. TO RUN AN AUTOMATIC TEST: Scroll through
the selections by pressing the UP ARROW or
DOWNARROWkeystodisplayAUTO,AUTO1or
AUTO 2 as desired and then press the AUTO key.
1. The unit will executethe series of tests without any
need for direct user interface. These tests vary in
length, depending on the component under test.
2. Whiletestsarerunning,“P#-#”willappearontheleft
display, where t he #’s indicate the test number and
sub-test. The right display will show a countdown
time in minutes and seconds, indicating how much
time there is left remaining in the test.
CAUTION
When a failure occurs during automatic
testing the unit will suspend operation
awaiting operator intervention.
Whenanautomatictestfails,itwillberepeatedonce.
Arepeatedtestfailurewillcause “FAIL”tobeshown
ontherightdisplay,withthecorrespondingtestnum-
ber to t he left. The user may then press the DOWN
ARROWtorepeatthetest,theUPARROWtoskipto
the next test or the PRE --TRIP key to terminate test-
ing. The unit will wait indefinitely, until the user
manually enters a command.
CAUTION
When Pre--Trip test Auto 2 runs to comple-
tion withoutbeing interrupted, the unit will
terminate pre-trip and display “Auto 2”
“end.”Theunitwillsuspend operationuntil
the user d epresses the ENTER key!
WhenanAuto1runstocompletionwithoutafailure,
theunitwillexitthepre-tripmode, andreturnto nor-
mal control operation. However, dehumidification
and bulb mode must be reactivated manually if re-
quired.
c. TO RUN AN INDIVIDUAL TEST: Scroll through
the selections by pressing the UP ARROW or
DOWN ARROW keys to display an individual test
code. Pressing ENTER when the desired test code is
displayed.
1. Individually selected tests, otherthan the LED/Dis-
play test, will perform the operations necessary to
verify the operation of the component. At t he con-
clusion, PASS or FAILwill bedisplayed. This mes-
sage will remain displayed for up to three minutes,
during which timea user may select another test. If
the three minute time period expires, the unit will
terminate pre-trip and return to control mode opera-
tion.
2. Whilethe tests are beingexecuted, theuser may ter-
minatethepre-tripdiagnosticsbypressingandhold-
ing the PRE-TRIP key. The unit will then resume
normal operation. If the user decides to terminate a
test but remain at the test selection m enu, the user
may press the UP ARROW key. When this is done
all test outputs will be de-energized and the test
selection menu will be displayed.
3. Throughout the duration of any pre-trip test except
the P-7 high pressure switch tests, the current and
pressure limiting processes are active .
d. Pre-Trip Test Results
At the end of the pre-trip test selection menu, the
message “P, ” “rSLts” (pre--trip results) will be
displayed.PressingtheENTER key will allowtheuser
toseetheresultsforallsubtests(i.e., 1-0,1-1, etc). The
resultswillbedisplayedas“PASS”or“FAIL”forallthe
testsrunto completion sincepower up. If atest hasnot
beenrunsincepowerup, “
-- -- -- -- --”willbedisplayed.
Once all pre--test activity is completed,
dehumidification and bulb mode must be reactivated
manually if required.
4.8 OBSERVE UNIT OPERATION
4.8.1 Probe Check
IftheDataCORDERisofforinalarmthecontrollerwill
revert to a four probe configuration which includes the
DataCORDER supply and return air probes as the
secondary controller probes. The controller
continuously performs probe diagnosis testing which
compares the four probes. If the probe diagnosis result
indicates a probe problem exists, t he controller will
perform a probe check to identify t he probe(s) in error.
a. Probe Diagnostic Logic -- Standard
Iftheprobecheckoption(controllerconfigurationcode
CnF31) is configured for standard, the criteriaused for
comparisonbetweentheprimaryandsecondarycontrol
probes is:
1_C(1.8_F)forperishablesetpointsor2_C(3.6_F)
for frozen set points.
If25ormoreof30readingstakenwithina30minute
periodareoutside ofthe limit, then adefrostis initi-
ated and a probe check is performed.
Inthisconfiguration,aprobecheckwill be runas apart
of every normal (time initiated) defrost.
b. Probe Diagnostic Logic -- Special
If the probe check option is configured for special the
abovecriteriaareapplicable.Adefrostwithprobecheck
will be initiated if 25 of 30 readings or 10 consecutive
readings are outside of the limits
Inthis configuration,aprobecheck will not be run as a
part of a normal defrost, but only as a part of a defrost
initiated due to a diagnostic reading outside of the
limits.
c.The30minutetimerwillberesetateachofthefollow-
ing conditions: