3--1
T--35603/11
SECTION 3
TROUBLESHOOTING
CAUTION
Do not under any circumstances attempt to service the microprocessor. Should a problem develop
with the microprocessor, replace it.
3.1 SELF DIAGNOSTICS
A self test is performed by the Micromax Logic Board
each time the board ispowered up. Errors, if any, willbe
indicated and the unit will not be allowed to start. The
errorcodescanbereadbycountingthenumberoftimes
that the Logic Board STATUS and CODE LED’s (see
Figure 1-6) flash simultaneously. The Micromate
control panel display will indicate errors with the code
ER--#, where “ER” is the error prefix and # is the error
number .
Table 3 -1 Error Codes
CODE NAME DESCRIPTION
ER 1 Data Memory Logic board data memory failure.
ER 2 Program Memory Logic board program memory failure.
ER 3 A/D A/D and multiplexer failure.
ER 4 Communication Failure Failure in communication between the logic board and MDST.
ER 5 Program Memory Display program memory failure.
3.2 SYSTEM ALARMS
3.2.1 Alarm Codes
The Micromax Logic Board continuously monitors
system parameters and will generate an ALARM if a
parameter exceeds preset limits. Alarms are indicated
and the controller will respond in accordance with the
information provided in Table 3-2. The alarm codes can
be read by counting the number of times that the Logic
BoardCODE LED(see Figure 1-6) flashes. Eachalarm
code is a two digit number, the first set of flashes is the
first digit and (after a slight pause) the second set of
flashes is the second digit.
TheMicromatecontrolpaneldisplaywillindicatealarms
with the code A--##or i--##, where“A” is an activealarm
prefix, “i” is an inactive alarm prefix and ## is the alarm
number . If no alarms are present, the display will show
“------”. To access the alarm codes, press the UP and
DOWN arrow keys at the same time and hold for 3
seconds. If multiple alarms are present the user can
scroll through each alarm by pressing the AUTO key.
Whenthe endof the alarm listis reachedthe display will
show “------”. Press VENT to scroll backward from the
latest alarm to the earliest alarm in the queue. When
using the VENT key to scroll back, only the alarm code
will be shown, the alarm time will not be shown. If the
AUTO key is held down for five seconds while “------” is
displayed all inactive alarms are cleared. A listing of
alarm codes is provided in Table 3-2.
3.2.2 Activation
When alarms are detected, they are placed in an alarm
queue in the order at which they initiated unless the
alarm is already present. Each alarm recorded will also
capture an evaporator hour meter reading
corresponding to the activation time. If the AUTO key is
pressed while an alarm is displayed, the activation time
capture will be shown.
3.2.3 Alarm Queue
The alarm queue consist of 10 alarm locations. When
the alarm queue is full the Logic Board will take the
requiredactionbutthealarm willnotberecorded.When
this situationoccurs,an“Alarm QueueFull”alarmwillbe
generated. When the alarms are viewed this will be the
first alarm to be shown.
3.2.4 Alarm Clear
TheusermayclearinactivealarmsusingtheMicromate
control panel keypad. Refer to paragraph 3.2.1.
3.3 TROUBLESHOOTING
General procedures for system troubleshooting are
provided in Table 3-3
(96 pages)
(310 pages)
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