Service manual

3-10T-294-01
Code
No.
DESCRIPTIONTITLE
Inapplicable Functions Display -- -- -- -- --
Cd39
Secondary Return
Air Temperature
(Optional)
This code is only applicable to units without a DataCORDER, that are configured
to have four probes. If this is true, it will then display the current secondary return
air temperature.If the unit is configured with a DataCORDER, the Controller
function code Cd39 will display “-- -- -- -- --,” and the display values for RRS will
appear on the DataCORDER function code dC2.
3.1.5 Controller Alarms
The alarm philosophy balances the protection of the
refrigerationunitandthatoftherefrigeratedcargo.The
action taken when anerrorisdetected alwaysconsiders
thesurvivalofthecargo. Rechecksaremadetoconfirm
that an error actually exists.
Somealarmsrequiringcompressorshutdownhavetime
delaysbeforeandafterto tryto keepthecompressoron
line.Anexample(seeTable 3-4)isalowmainsvoltage,
whenthevoltagedropsover25%,anindicationisgiven
on the display, but the unit will continue to run.
An alarm is indicated by flashing an alarm code on the
display panel, and for some alarms, by the alarm light
illuminating.
When an Alarm Occurs:
S The red alarm light will illuminate for “20
series” alarms only.
S If a detectable problem is found to exist, its
alarm code will be alternately displayed with
the set point on the l eft display.
S The user should scroll through the alarm list
to determine what alarms exist or have
existed. Alarms must be diagnosed and
corrected before the Alarm List can be
cleared.
To Display Alarm Codes:
While in Set Point Selection or Default Display mode,
press the ALARM LIST key. This accesses the Alarm
ListDisplayMode,whichdisplaysanyalarmsarchived
in the Alarm Queue. The alarm list stores up to 16
alarmsinthesequenceinwhichtheyoccurred. Theuser
may scroll through the list by depressing the UP
ARROW key. Depressing the DOWN ARROW key
allows the user to scroll backward through the list.
The leftdisplay will show “AL#,”where # is the alarm
number sequentially in the queue.
The right display will show:
S “AAXX” for an active alarm, where “XX” is
the alarm code. See Table 3-4, Controller
Alarm Indications.
S “IAXX” for an inactive alarm.
“END”is displayedtoindicate the endof the alarm list
if any alarms are active. “CLEAr” is displayed if all
alarms are inactive.
S The alarm queue may only be cleared if no
alarms are active, other than alarm code
AL51, and “CLEAr” is displayed.
To Clear the Alarm List:
If all above conditions have been satisfied, e.g. no
alarmsareactiveotherthanAL51, thealarm queuemay
be cleared.
S Press the ENTER key. The alarm list will
clear and “
-- -- -- -- -- ” will be displayed.