ABB ACS580 VFD
ABB ACS580 VFD code D502: All motors interlocked
All motors in the pump control system are interlocked, which prevents the drive from starting them.
- Code
- D502
- Name
- All motors interlocked
- Controller
- ABB ACS580 VFD
- Type
- Safety interlock
- 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
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- What to do next, in plain words
- What the manual says to do, and the page it is on
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Questions about this code
What does ABB ACS580 VFD code D502 mean?
All motors in the pump control system are interlocked, which prevents the drive from starting them.
Is ABB ACS580 VFD code D502 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 D502?
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.