Servo alarms on CNC machines cause immediate machine stop and cannot be overridden until the fault is cleared. Each alarm code points to a specific problem — encoder fault, overload, communication error, or power supply issue. This guide explains the most common servo alarms and how to fix them. Parts available in UAE same-day.
Encoder cable damaged, connector loose, or encoder disc dirty. Controller loses position feedback and triggers alarm.
Servo motor or driver sustained overload. Mechanical jam, excessive cutting force, or motor undersized for application.
Motor exceeded maximum speed limit. Usually caused by encoder fault giving false position data or incorrect parameter setting.
DC bus voltage outside normal range. Mains supply issue, regenerative energy fault, or power supply problem.
Controller-to-driver communication lost. Cable fault, connector corrosion, or driver board failure.
Servo motor overheating. Excessive load, blocked ventilation, or high ambient temperature in the control panel.
Note the exact servo alarm number shown on the servo driver display or in the CNC controller alarm list. Each number maps to a specific fault type. Consult your servo driver manual for the exact meaning.
After fixing the fault condition, power off the machine completely, wait 30 seconds, then power on. Most servo alarms clear automatically after power cycle if the underlying fault is resolved.
Inspect the encoder cable from motor to driver. Look for bent pins at connectors, damaged cable jacket, or loose connection. Reseat firmly. Encoder faults are the most common servo alarm in UAE environments due to cable vibration and dust.
If overload alarm, manually move the axis by hand (machine off). Should move smoothly. Stiff or jammed axis = mechanical issue. Find and remove the jam before restarting.
Verify 24V control power is stable. Measure at the servo driver control terminals. Low voltage (below 22V) can cause communication and parameter alarms.
If alarm cannot be cleared, WhatsApp our technician with the alarm number, your servo driver brand/model, and a description of what happened before the alarm. We diagnose within 1 business hour.
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 supplies servo system components and CNC spare parts across UAE. If your servo driver or motor has failed, WhatsApp us with your unit specifications and we will source a replacement. Same-day dispatch available on stocked items.
Common questions about CNC servo motor and driver alarms
Encoder faults are the most common servo alarm in UAE workshop environments. Dust, vibration, and heat cause encoder cable connector issues. Inspect and reseat the encoder cable connector at both the motor and driver end as the first step.
Intermittent alarms that return usually indicate a marginal fault — a hairline crack in an encoder cable that breaks under vibration, an overloaded axis where friction is borderline, or a power supply with marginal output voltage. Systematic diagnosis under load is needed.
The servo alarm system is designed to protect both the drive and the machine. Responding quickly to alarms prevents further damage. Ignoring repeated overload alarms will damage the servo motor windings. Address alarms promptly.
Yes — a replacement servo driver usually requires parameter programming to match your motor specifications (motor type, encoder type, inertia ratio, speed and torque limits). AACNC can provide on-site commissioning service across UAE.
Yes — AACNC can source servo drivers and servo motors for CNC machines in UAE. WhatsApp us with your brand and model number for pricing and availability. We offer same-day dispatch on stocked items.