Page 92
FCO770 Users Guide Issue 1
TROUBLE SHOOTING
PROBLEM: INSTRUMENT DISPLAYS “PRESSURE LOW” AND WILL NOT
START.
Cause:
The pressure regulator is set too low, or the air supply pressure is too low.
Action:
Ensure the air line is on. Check the pressure regulator is set correctly.
PROBLEM: THE INSTRUMENT DISPLAYS “** WARNING: Mnn **”
Cause:
There is a Maintenance Early Warning System alert.
Action:
‘nn’ is a number that indicates the cause of the warning. Check the Warning
System section of this manual for details or look in the instrument’s Warning
System menu where the active warnings will flash. The instrument may
require a service, or it may be time to export data from the data logger.
PROBLEM: INSTRUMENT FAILS ALL TEST ITEMS.
Cause:
Every item is leaky, the jig is leaking, the connections from the FCO770 to the
test item are leaking or the instrument has an internal leak.
Action:
Blank the instrument and run a test. If the test passes, then the external pipe
work or test item may be leaky. Isolate parts of the test jig and leak test until
the leak is found. If the instrument fails the self check, then it will require
servicing.
Cause:
The test item is not being allowed to stabilise.
Action:
Check that the fill and stabilisation times are long enough to allow the item to
stabilise. If in doubt, start with long times and then reduce them.
Cause:
The leak test parameters are too stringent.
Action:
Ensure that the test timer and level are realistic. Flexible items will give more
variation in results than rigid items.
PROBLEM: INSTRUMENT PASSES ITEMS WITH LARGE LEAKS.
Cause:
The test tolerance is set too wide which allows the test pressure to decay
during stabilisation time, leaving no pressure to test with.
Action:
Set the tolerance for the pressure to a suitable level (e.g. 10%).
PROBLEM: INSTRUMENT PASSES ALL ITEMS.
Cause:
The pressure tolerance is set too large, and the jig has a large leak, or the test
pressure is turned to zero.
Action:
Set a pressure tolerance of about 10%. This will then detect large leaks and
errors in the pressure setting.
Cause:
The instrument is not being connected to the test item.
Action:
Check that the instrument is piped to the jig, and if an exhaust valve is being
used, check that it is operating.
Summary of Contents for FCO770
Page 2: ......
