Diagnosis Flow Chart And Troubleshooting - Omega FC-21 User Manual

FC-21 Flow Computer

13.2 Diagnosis Flow Chart and Troubleshooting

All instruments undergo various stages of quality control during pro-
duction. The last of these stages is a complete calibration carried out
on state-of-the-art calibration rigs.
A summary of possible causes is given below to help you identify
faults.
Is there an input power
supply voltage across
Terminals 23 and 24?
Yes
Is the Display Backlight
Visible?
Yes
Are the Display
Characters Visible?
Yes
Is there a black bar
across the display?
No
Does the display
alternate between blank
and sign on message?
No
Does the display show
an error message?
No
No system or process
errors present.
66
Check the connections
according to the circuit
No
diagrams.
Check junction box fuses.
Check/Replace internal
fuse. If fuse is OK,
No
Factory Service Required.
The display may not be
visible with ambient
temperatures below -10 °C
No
Allow the instrument to
warm up.
Contact factory if
necessary
Check line voltage.
If voltage is OK,
Yes
Factory Service Required.
Check line voltage.
If voltage is OK,
Yes
Factory Service Required.
See section 12.3 for
cause and remedy.
Yes