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LEVELtrol-II Installation & Operating Instructions
13.2 Diagnosis Flow Chart and Troubleshooting
Is there an input power
supply voltage across
Terminals 23 and 24?
No
Yes
Check the connections
according to the circuit
diagrams.
Check junction box fuses.
Is the LCD Display
Backlight Visible?
No
Yes
Check/Replace internal
fuse. If fuse is OK,
Factory Service Required.
Is there a black bar across
the LCD display?
Yes
No
Does the display
alternate between blank
and sign on message?
Yes
No
Does the display show
an error message?
Yes
No
See section 12.3 for
cause and remedy.
No system or process
errors present.
Are the Display
Characters Visible?
No
Yes
The LCD display may not
be visible with ambient
temperatures below -10 °C
Allow the instrument to
warm up.
Contact factory if
necessary
Check line voltage.
If voltage is OK,
Factory Service Required.
Check line voltage.
If voltage is OK,
Factory Service Required.
All instruments undergo various stages of quality control during produc
-
tion. 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.
NOTE: The 24 VDC output on terminal 1 is equipped with a thermal
self resetting fuse. The fuse will open if a short circuit occurs
or if more than 100 mA is drawn from terminal 1. To reset fuse:
turn power off for two minutes or disconnect wire from terminal
1 for two minutes.
