Fault Diagnosis With Test Functions - Teledyne T700 Operation Manual

Troubleshooting and Service
WARNING
REGULATOR PRESSURE
WARNING
RELAY BOARD WARN
SYSTEM RESET
VALVE BOARD WARN
1
Only applicable for calibrators with the optional the O
2
Only applicable for calibrators with the optional photometer installed.
3
On instrument with multiple Cal Gas MFCs installed, the MFC FLOW WARNING occurs when the flow rate requested is
<10% of the range of the lowest rated MFC (i.e. all of the cal gas MFC are turned off).

9.1.2. FAULT DIAGNOSIS WITH TEST FUNCTIONS

234
FAULT CONDITION
Regulator pressure is
< 15 PSIG or > 25 PSIG.
The CPU cannot
communicate with the
Relay PCA.
The computer has
rebooted.
The CPU is unable to
communicate with the valve
board.
Besides being useful as predictive diagnostic tools, the test functions viewable from the
calibrator‟s front panel can be used to isolate and identify many operational problems
when combined with a thorough understanding of the calibrator‟s Theory of Operation
(see Section 10).
The acceptable ranges for these test functions are listed in the "Nominal Range" column
of the calibrator Final Test and Validation Data Sheet shipped with the instrument.
Values outside these acceptable ranges indicate a failure of one or more of the
calibrator‟s subsystems. Functions whose values are still within acceptable ranges but
have significantly changed from the measurement recorded on the factory data sheet
may also indicate a failure.
A worksheet has been provided in Appendix C to assist in recording the values of these
Test Functions.
Table 9-2 contains some of the more common causes for these values to be out of range.
Teledyne API – Model T700 Dynamic Dilution Calibrator
POSSIBLE CAUSES
- Zero or source air supply is incorrectly set up or
improperly vented.
- Incorrectly adjusted O
- Leak or blockage exists in the T700‟s internal pneumatics
- Failed O
Generator Input pressure sensor
3
- I 2
C Bus failure
- Failed relay PCA
- Loose connectors/wiring
- This message occurs at power on.
- If it is confirmed that power has not been interrupted
- Failed +5 VDC power
- Fatal error caused software to restart
- Loose connector/wiring
- I 2
C Bus failure
- Failed valve driver PCA
- Loose connectors/wiring
generator installed.
3
zero air pressure regulator
3
06873E DCN7106