100 models · 2 manufacturers

CNC Controls repair

CNC control units, display units, I/O boards and axis and spindle amplifiers on machine tools. CNC controls combine a computer, operator display, I/O and axis drives. Faults in any one stop the machine, and the parameters and machine data have to survive the repair. Control units, displays, I/O boards and amplifiers can be repaired at board level.

Manufacturers

CNC Controls by manufacturer

Common faults

What usually fails on CNC Controls

Control unit won't boot
Power supply faults, a flat backup battery or corrupted memory stop the control at power-up.
Display and keyboard faults
Dead or dim displays, failed CRT-to-LCD units and unresponsive operator keys.
Axis and spindle amplifier alarms
Overcurrent, overload and feedback alarms from the amplifiers or the motors they drive.
I/O link and interface faults
Loss of communication with machine I/O, causing emergency-stop or ready alarms.
Lost parameters
Machine data lost through a failed battery or memory, leaving axes unconfigured.

First checks

What to check before calling an engineer

Isolate and lock out the supply, and wait for stored energy to discharge, before opening anything.

Safe for plant staff

Record all alarm numbers shown on the screen.
Keep the backup battery fresh, and change it with the control powered on where the maker says to.
Back up parameters, programs and PLC data while the control works.

Leave to a specialist

Restoring machine data and parameters.
Board-level repair of control units and amplifiers.
Reference-point and axis set-up after a repair.

Warranty. Repairs carry a warranty of 30 days to 6 months, depending on the item and the repair; the exact term is confirmed before work starts.

FAQ