TELEDYNE API T300M - Fault Diagnosis with Alerts; Table 5-4. Alerts - Indicated Failures

114 Maintenance and Service 083730300A DCN8101
5.7.2 FAULT DIAGNOSIS WITH ALERTS
The most common and/or serious instrument failures will result in a warning message,
called an Alert. Table 5-4 lists some of the more common Alert messages, along with
their meaning and recommended corrective action.
It should be noted that if more than two or three warning Alerts occur at the same time, it
is often an indication that some fundamental analyzer sub-system (power supply, relay
board, motherboard) has failed, rather than being an indication of the specific failures
referenced by the warning Alerts.
Table 5-4. Alerts - Indicated Failures
ALERT MESSAGE
FAULT CONDITION POSSIBLE CAUSES
BENCH TEMP
WARNING
The optical bench temp is
controlled at 48 ± 2
°
C.
Bad bench heater
Bad bench temperature sensor
Bad relay controlling the bench heater
Entire relay board is malfunctioning
I
2
C bus malfunction
BOX TEMP
WARNING
Box Temp is
< 5
°
C or > 48
°
C.
NOTE: Box temperature typically runs ~7
o
C warmer than
ambient temperature.
Poor/blocked ventilation to the analyzer.
Stopped exhaust-fan
Ambient temperature outside of specified range
CANNOT DYN
SPAN
Dynamic Span operation failed.
(Contact closure span calibration
failed while DYN_SPAN was set
to ON).
Measured concentration value is too high or low.
Concentration slope value to high or too low
CANNOT DYN
ZERO
Dynamic Zero operation failed
Measured concentration value is too high.
Concentration offset value to high.
CONFIG
INITIALIZED
Configuration and Calibration
data reset to original Factory
state.
Failed disk on module
User erased data
DATA INITIALIZED
Data Storage in DAS was erased
Failed disk on module
User cleared data
PHOTO TEMP
WARNING
PHT DRIVE is
>4800 mVDC
Failed IR photo-detector
Failed sync/demod board
IR photo-detector improperly attached to the sample chamber
Bench temp too high.
REAR BOARD
NOT DET
Motherboard not detected on
power up.
Warning only appears on serial I/O com port(s)
Front panel display will be frozen, blank or will not respond.
Massive failure of motherboard
RELAY BOARD
WARNING
The CPU cannot communicate
with the Relay Board.
I
2
C bus failure
Failed relay board
Loose connectors/wiring
SAMPLE FLOW
WARNING
Sample flow rate is < 500
cm
3
/min or > 1000 cm
3
/min.
Failed sample pump
Blocked sample inlet/gas line
Dirty particulate filter
Leak downstream of critical flow orifice
Failed flow sensor/circuitry