Fanuc alarm SV0366: PULSE LOSS (BUILT-IN)
0i-D servo alarm (built-in pulse coder) · Fanuc 0i-D
What it means
Lost pulses detected in built-in pulsecoder output - counted pulses do not match expected pattern
Likely causes
- pulse coder disc/sensor defect
- mechanical shock to motor
- noisy/damaged feedback cable
Triage note: Check cable shielding/ground first (cheap), then replace coder; pair with SV0367 count loss diagnostics
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
- View part →
A860-2000-T301
Pulse Coder (alpha iA1000) · Primary suspect
- Request a quote →
A06B-6134-K003
Encoder Feedback Cable Set (beta i) · Check if others ruled out
Need the part urgently?
Send us alarm SV0366 with your machine details — typical RFQ turnaround is 24–48h.