On Tue, 18 Mar 2014 23:02:44 -0500, Jon Elson
wrote:

wrote:

Greetings All,
One of my CNC mills has a problem. The machine, a Fadal 15XT, built in
1998, (I think), keeps showing an alarm for a malfunction the machine
can't have.
Likely there is a rack of opto-coupled sensor modules. The lube and air
pressure sensor positions have likely been dummied out with jumper
wires. The symptom you describe is typical of a worn-out opto-coupler
where the LED light output is dying from being lit for 15 years. If
you can figure out which input coupler is the one for these functions,
you can probably just replace them. PLCcenter is a great resource
for all sorts of obscure Japanese components like this.

Jon
Greetings Jon,
There are opto-coupled boards in the machine but none on this board.
The Fadal repair folks told me this board is the interface board and
is probably the problem and since removing and replacing it stops the
alarm every time I think they are probably correct. However, I will
try to identify what all the opto-couplers do and see if any of them
are for the sensors that are not there.
Eric

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