Gasboy CFN Series Diagnostic Manual - Manual (Page 60)

GASBOY CFN Series
2-34 0021
No console loop communications. All devices on console loop are down.
Possible Cause Checks Corrective Action
Site Controller is down. Check logger or do a PRint
DIagnostics command for
indication that the site is not
running. Do a RUN command if site is
down
RS-485 phone cable is loose
or not installed correctly. Check that one end of the
cable is installed in the
CONSOLE LOOP connector
on the rear of the site
controller and the other end is
installed in the SITE
CONTROLLER connector on
the rear of the console, or into
the console junction box (if
used). Install cable properly, if it is
incorrect
Incorrect wiring between
junction boxes (used only
when console is located more
than eight feet from site
controller). Move console within eight feet
of site controller and connect
directly using modular cable.
Verify all field wiring with the
SC I Installation Manual
(C01917)
If console works, proceed to
next check.
Make wiring connections, if
needed
Defective RS-485 receiver IC
and Protected Driver Board. None. Replace U2 and U3 on the
SC I CPU Board. When
replacing U3, replace the
entire Protected Driver Board
(C05848), not just the driver
IC.
If a junction box is used for
remote console
communication wiring, verify
that it is properly grounded as
shown in the SC I Installation
Manual.
Defective RS-485 junction
board (if used). None. Replace the RS-485 junction
board.
Defective CPU board. None. Replace the SC I CPU board.