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62-11039
7-1
SECTION 7
ALARM TROUBLESHOOTING
7.1 INTRODUCTION TO ALARM TROUBLESHOOTING GUIDE
The Alarm Troubleshooting Guide should be used
whenever an alarm occurs. Alarms will appear in the
Message Center and will begin with the alarm number.
Alarms are listed in the Troubleshooting Guide by alarm
number.
When an alarm occurs, look through both Active and
Inactive alarm lists in the microprocessor. (See Note 1
Section 7.2 ) and make note of all alarms.
Before beginning to actually troubleshoot a unit, visually
inspect the unit, in particular the area of the unit that is
causing a problem. In many cases the cause of the
problem will be obvious once a visual inspection is
performed. For those cases where the cause of the
problem is not obvious, this troubleshooting guide will be
of assistance.
Usually you should begin troubleshooting with the first
alarm that appears in the active alarm list. Other alarms
in the list may have contributed to the occurrence of the
first alarm. The first alarm that appears is the last alarm
that was recorded.
The check items in the troubleshooting guide are listed
in order of their likeliness of occurrence and ease of
testing. We recommend that you follow the order in
which they are presented; however, there may be times
when situations or experience directs you to use a
different order. For example, if the trailer is loaded, you
may want to perform all the condensing unit checks first,
even though some evaporator section checks may be
listed before them.
As you go through the troubleshooting steps, you will
find the cause of the problem. When you find and
correct the problem, it is not necessary to continue
through the remainder of the steps. Some active alarms
will clear (inactivate) themselves automatically once the
cause has been corrected. You then only need to go to
the inactive list to clear all alarms before verifying the
remainder of the unit operation. Alarms that do not
inactivate themselves automatically must be cleared
manually. (See Note 1 Section 7.2 )
When you are finished making repairs, run the unit
through a Pretrip cycle and verify that no further active
alarms occur. Also, both alarm lists should be cleared
so that there are no ‘old’ alarms in memory when the unit
leaves your repair facility.
If the message
CHECK MICROPROCESSOR
or
CHK WIRES FROM MICRO TO KEYPAD
appears in
the MessageCenter, there is a communication error
between the keypad and the microprocessor. With no
communication, there will not be an associated alarm.
Should this occur, check the wire connections behind
the keypad assembly, at the keypad itself (remove the
rear cover from it to check), and at connector 5 on the
microprocessor. Check for microprocessor status led
blinking at 1 second rate (1 second ON/1 second OFF).
When working on the refrigeration system, an
accurately calibrated manifold test set should always be
installed. It is not necessary to connect an additional
high pressure gauge to the king valve. The
MessageCenter, under DATA, will display suction
pressure, discharge pressure and evaporator pressure.
In high or low ambients it may be necessary to cool or
warm the box temperature before performing specific
tests providing that the compartment is not loaded with
perishable product.
WARNING
When performing service and/or mainte-
nance procedures, make certain the unit
is disconnected from the power source
and that the RS is in OFF position so that
it is impossible for the unit to start up au-
tomatically during the maintenance opera-
tion.
Summary of Contents for VECTOR 1800 MT
Page 1: ......
Page 2: ...OPERATION SERVICE MANUAL for VECTOR 1800 MT Trailer Multi Temp Refrigeration Units ...
Page 19: ...1 5 62 11039 1 3 SAFETY DECALS ...
Page 20: ...1 6 62 11039 62 03958 00 Heat Warning 62 03957 01 High Voltage 62 60280 00 Standby Safety ...
Page 21: ...1 7 62 11039 ...
Page 303: ...10 1 62 11039 ...
Page 310: ...10 8 62 11039 BASED ON ENGINEERING SCHEMATIC 62 60926 REV G NEXT SHT ...
Page 311: ...10 9 62 11039 FROM PREVIOUS SHT ...