When one or more CNC axes stops moving, your machine cannot run any programs. The problem could be a driver alarm, wiring fault, failed stepper motor, mechanical jam, or controller issue. This guide walks you through every step to find and fix the fault. Replacement parts available in UAE same-day.
The stepper driver for that axis has tripped on overcurrent or overtemperature. Check the driver LED — red or flashing means alarm state.
Loose, broken, or short-circuited motor cable. Even one open wire in the motor coil will prevent movement.
The axis is at or beyond its limit switch position. Controller prevents movement to protect the machine.
The enable signal from the controller to the driver is missing or wired incorrectly. Driver is powered but not enabled.
Lead screw, linear rail, or coupling has seized. Motor tries to move but cannot — driver trips on overload.
Motor winding has burned out or short-circuited. Motor gets hot, does not move, or moves erratically.
Try jogging X, Y, and Z separately. Note which axis does not move. Also note if the axis makes a humming sound (motor energised but not moving) or is completely silent (no power reaching motor).
Look at the driver for the affected axis. A green LED means normal. Red or flashing means alarm. Power off, check motor wiring on that axis, reconnect all terminals, power on and retry.
In the RichAuto controller status screen, check if any limit switch shows as triggered. If yes, jog the axis away from the limit using the manual override function. If the limit switch itself is stuck, replace it.
Power off. Disconnect the motor cable at the driver. Use a multimeter to check continuity on all 4 motor wires (A+, A-, B+, B-). Any open circuit = broken wire or failed motor winding.
With machine off, manually push the axis carriage. It should move smoothly with light resistance. If it is stiff or jammed, locate the mechanical obstruction — check lead screw, coupling, and linear rails.
If driver alarm cannot be cleared and wiring is confirmed good, the driver has failed. If motor winding tests open circuit, the motor has failed. AACNC stocks stepper motors and drivers in UAE.
Send us a photo of your machine, alarm code, or faulty part. Nova (our AI) identifies the fault instantly — our CNC expert confirms and tells you exactly which part to order.
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AACNC stocks CNC stepper motors, stepper drivers, and all common axis components in UAE. Send us a WhatsApp photo of your current motor or driver nameplate and we will source the exact replacement. Same-day dispatch from Dubai.
Common questions about CNC axis movement problems
One-direction movement usually indicates a broken motor wire on one coil (A+ or A- open), a faulty limit switch on one end, or incorrect driver microstep or direction settings. Check wiring first, then verify limit switch operation.
Humming without movement means the motor is energised (driver is outputting power) but the rotor cannot turn. Causes: mechanical jam, incorrect wiring phase order, or underpowered driver. Check for mechanical obstruction first.
Most stepper drivers reset automatically after the fault condition is removed. Power off the machine, fix the wiring fault, then power on. If the alarm persists with no wiring fault, the driver itself has failed and needs replacement.
Yes — as long as you match the motor current rating and connector type. Send us your existing motor nameplate details and we will supply a compatible replacement.
Yes — AACNC stocks NEMA 23 and NEMA 34 stepper motors plus compatible stepper drivers in UAE. Same-day dispatch. WhatsApp us with your motor specifications for a quote.