FANUC Alarm SRVO-291 — IPM over heat
Error- Hardware
- servo amplifier
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- SERVO
Manufacturer wording — IPM over heat (G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-291 (“IPM over heat”): It was detected that the IPM element in the amplifier had overheated.
Updated 2026-10-22 · LogrobotLM reference
Description
It was detected that the IPM element in the amplifier had overheated.
Field diagnosis
The amplifier IPM power module has exceeded its allowable temperature.
What to check
- Clean blocked vents, check that the fan rotates, reduce the cycle rate if the code only appears under heavy load; replace the amplifier if it happens frequently.
- Note: Keep an eye on the cabinet air inlet filter: a clogged filter is enough.
Related codes
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 →