Carrier 69NT40-541-505, Руководство по эксплуатации и обслуживанию, Страница: 84 / 143

T-368 5–4
matically terminate. When initiated via commu-
nications, a Pre
− trip test may not be interrupted
with an arrow key, but the Pre − trip test can be
terminated with the PRE − TRIP key.
a. Press the PRE − TRIP key to accesses the Pre − trip
test selection menu.
b. TO RUN AN AUTOMATIC TEST: Scroll through the
selections by pressing the UP ARROW or DOWN
ARROW keys to display AUTO, AUTO 2 or AUTO 3
as desired and then press the ENTER key.
1. The unit will execute the series of tests without any
need for direct user interface. These tests vary in
length, depending on the component under test.
2. While tests are running, “P#-#” will appear on
the left display, where the #’s indicate the test
number and sub-test. The right display will show
a countdown time in minutes and seconds, indi-
cating the amount of time remaining in the test.
CAUTION
!
When a failure occurs during automatic
testing the unit will suspend operation
awaiting operator intervention.
When an automatic test fails, it will be repeated once .
A repeated test failure will cause “FAIL” to be shown on
the right display, with the corresponding test number to
the left.
The user may then press the DOWN ARROW to repeat
the test, the UP ARROW to skip to the next test or the
PRE-TRIP key to terminate testing. The unit will wait
indefinitely until the user manually enters a command.
CAUTION
!
When Pre-Trip test Auto 2 runs to com-
pletion without being interrupted, the unit
will terminate pre-trip and display “Auto
2” “end.” The unit will suspend operation
until the user depresses the ENTER key!
When an Auto test runs to completion without a failure,
the unit will exit the Pre-trip mode and return to normal
control operation.
If configuration variable CnF42 is set to IN, a Data-
CORDER trip start will be entered. If CnF42 is set to
OUT, the trip start will not be entered. However, dehu-
midification and bulb mode must be reactivated manu-
ally if required.
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. Press-
ing ENTER when the desired test code is displayed.
1. Individually selected tests, other than the LED/
Display test, will perform the operations neces-
sary to verify the operation of the component. At
the conclusion, PASS or FAIL will be displayed.
This message will remain displayed for up to
three minutes, during which time a user may
select another test. If the three minute time
period expires, the unit will terminate pre-
trip and return to control mode operation.
2. While the tests are being executed, the user
may terminate the pre-trip diagnostics by press-
ing and holding 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 menu, 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 dis-
played.
3. During Pre − trip testing, current limiting and
pressure limiting are both active, except during
P
− 7 (High Pressure Switch Testing) when pres-
sure limiting is turned off.
d. Pre-Trip Test Results
At the end of the pre-trip test selection menu, the mes-
sage “P,” “rSLts” (pre-trip results) will be displayed.
Pressing the ENTER key will allow the user to see the
results for all subtests (i.e., 1-0, 1-1, etc).
The results will be displayed as “PASS” or “FAIL” for all
the tests run to completion since power up. If a test has
not been run since power up, “ −−−−− ” will be displayed.
Once all pre-test activity is completed, dehumidification
and bulb mode must be reactivated manually if required.
5.8 PROBE DIAGNOSTICS
A complete temperature probe check is performed
during the P5 Pre − trip test. A probe check is also run at
the end of a defrost cycle; the defrost light will remain
on during this period. If supply probes are within limits
and return probes are within limits, the unit will return to
normal operation. During normal operation, the control-
ler continuously monitors and compares adjacent tem-
perature probe readings.
The probe check procedure consists of running the
evaporator fans for up to eight minutes in order to com-
pare the readings from the adjacent temperature
probes. If a significant difference in temperature read-
ings is detected between probes, a defrost cycle, fol-
lowed by another probe check may be initiated. Any
continued disagreement between probes will prompt
the controller to invalidate the failed temperature
probe, and the backup probe will be used for tempera-
ture control.
In Perishable Mode, both pairs of supply and return
probes are monitored for probe disagreement. Probe
disagreement is considered a difference of 0.5°C
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