ABB ACS580 VFD
ABB ACS580 VFD code A794: BR data
The brake resistor data has not been provided, which prevents the drive from operating correctly.
- Code
- A794
- Name
- BR data
- Controller
- ABB ACS580 VFD
- Type
- Setup or parameter fault
- 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 3 common causes listed for this code
- 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 A794 mean?
The brake resistor data has not been provided, which prevents the drive from operating correctly.
Is ABB ACS580 VFD code A794 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 A794?
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.