Fanuc alarm SP9044: CONTROL CIRCUIT A/D ERROR
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
An anomaly was detected in the A/D converter section of the spindle amplifier control circuit. Since analog measurements (currents, voltages, sensor levels) feed every protective and control function, unreliable conversion makes safe operation impossible and the amplifier shuts down.
Likely causes
- Failed A/D converter or its reference on the control board
- Board contamination or moisture affecting analog inputs
- Surge damage to analog front-end components
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6120-Hxxx
alpha i Spindle Amplifier Module (SPM) · Primary suspect
Need the part urgently?
Send us alarm SP9044 with your machine details — typical RFQ turnaround is 24–48h.