ABB ACS580 VFD
ABB ACS580 VFD code A491: External temperature 1
The first measured external temperature has exceeded its warning limit, which alerts the operator without stopping the booth equipment.
- Code
- A491
- Name
- External temperature 1
- Controller
- ABB ACS580 VFD
- Type
- Over temperature
- What it does
- Warning: the equipment keeps running and flags a problem
- Risk
- GREEN In your wheelhouse
- Reset
- Clears on its own when the condition goes away
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated November 4, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- What the manual says to do, and the page it is on
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does ABB ACS580 VFD code A491 mean?
The first measured external temperature has exceeded its warning limit, which alerts the operator without stopping the booth equipment.
Is ABB ACS580 VFD code A491 dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix ABB ACS580 VFD code A491?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.