Fanuc alarm SP9019: SERIAL SPINDLE AL19: EXCESSIVE U-PHASE CURRENT OFFSET
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
Initial value of U-phase current detection circuit out of range at power-up (AL20 = V-phase)
Likely causes
- SPM current-detection circuit drift/failure
- loose connector between power unit and control PCB after service
- control PCB failure
Triage note: Reseat the power-unit-to-control-PCB connectors first if the alarm appeared after board service; otherwise SPM exchange
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6202-H222
Spindle Amplifier Module (alpha iSP SPM) · Primary suspect
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A20B-8201-0190
SPM Control PCB · Common cause
Need the part urgently?
Send us alarm SP9019 with your machine details — typical RFQ turnaround is 24–48h.