Your CNC just threw an alarm. Before you start pressing Reset and hoping for the best, here's what the different codes actually mean.
What the Main Alarm Categories Mean
• Axis/servo alarms — something's wrong with a movement axis. Could be electrical, mechanical, or a feedback signal issue.
• Spindle alarms — the spindle motor or drive has detected overload, overheating, or an encoder fault.
• PLC alarms — a safety circuit has flagged something. Door not closed, pressure switch unhappy, limit switch triggered.
• Program alarms — something in the NC code doesn't make sense to the controller.
• Communication alarms — the controller has lost contact with a drive, encoder, or peripheral.
• Battery low alarm — this one needs acting on fast. See below.
The Battery Alarm — Act on It Now
That small lithium battery keeps all your stored data alive when the machine is off — parameters, tool offsets, programs. When it dies, that data goes with it. Battery swap is cheap and simple, but must be done while the machine is powered on to avoid data loss. You've got a few weeks — don't sit on it.
When the Same Alarm Keeps Coming Back
One-off alarm that clears? Possibly a glitch. Same alarm repeating? Something is failing. Every reset just masks a deteriorating component. Get it diagnosed before a small fault turns into a big repair bill.
Got an alarm you can't figure out? Give us the machine make, the code, and what it was doing — we can often diagnose remotely. Give us a ring.
0121 272 5242 | service@cncguru.co.uk | www.cncguru.co.uk
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