Fanuc alarm HC: Overcurrent alarm (LED legend)
βi SVU/SVM · Fanuc βi SVU/SVM
What it means
The 'HC' legend LED on the β SVU lights on detection of abnormal current in the output stage. This corresponds to the classic HCL/HCM-style overcurrent protection and frequently indicates a short in motor, cable or power transistors.
Likely causes
- Phase-to-phase or ground short in motor power cable
- Motor winding short circuit
- Failed output transistors/power module in the SVU
Triage note: Disconnect motor leads and retest to isolate amp vs motor/cable.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
- Request a quote →
Servo motor power cable
amplifier · Common cause
- Request a quote →
A06B-6093-Hxxx (SVU)
amplifier · Common cause
Need the part urgently?
Send us alarm HC with your machine details — typical RFQ turnaround is 24–48h.