FANUC Alarm SRVO-315 — MPDT failed

Manufacturer wording — MPDT failed(G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SRVO-315 (“MPDT failed”): ## First check: Magnetic Phase Detection (MPDT) for 3rd party motor failed.

Updated 2026-09-17 · LogrobotLM reference

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →