B-63983EN/02 11.PMC ALARM MESSAGES AND ACTIONS TO TAKE
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System alarms began to occur after the machine had been in operation for
about one year.
<Category> Failure to connect the optical I/O Link adapter to
ground
<Configuration> (Unknown)
<Cause> The connection between the optical I/O Link
adapter case and the inside of the optical I/O Link
adapter was loose.
<Explanation> The case of the optical I/O Link adapter is not
painted and serves as a grounding body as well.
Therefore, the optical I/O Link adapter must be
connected to ground. In this case, the adapter was
properly grounded but, because it was installed in a
position subject to vibration, the connection
between the adapter case and the inside of the
adapter had been lost.
A system alarm occurs every time the power is turned on.
<Category> CNC or I/O device malfunction or failure
<Configuration>
NC
Operator's
panel I/O
Group 0
Spindle
monitor unit
Group 1
Connector
panel I/O
Group 2
Connector
panel I/O
Group 3
Connector
panel I/O
Group 4
Connector
panel I/O
Group 5
<Cause> The basic connector panel I/O module of group 5
was faulty.
<Explanation> Since the alarm had occurred every time the power
was turned on, we removed the devices
sequentially, starting with the one having the
largest group number, and checked whether an
alarm would arise. As a result, we found out that
the system would start normally when group 5 was
removed. We then conducted a test with the basic
module of group 5 attached to another CNC and
discovered that the error was due to the
malfunction of that individual module.