ABB ACS800 Common Fault Codes – Part 3

ABB’s ACS800 Variable Frequency Drive is powerful AC drive that can handle applications from 0.75 to 7500 horsepower with ease. Advanced harmonics mitigation technology provide a cost efficient solution to meet your most stringent power quality standards.

The ACS800’s highly flexible, highly programmable platform makes integrating the drive into just about every drive-motor application you can think of. The drive’s “Everything Inside” design makes it fantastic “plug-and-play” tool but the drive really shines when it is tailor made for your most precise applications. The drive is suitable for use in process industries such as pulp and paper, metals, mining, cement, power, chemical, and oil and gas. The ACS800 can even be found powering offshore supply vessels in the Gulf of Mexico!

Because the ACS800 is such a valuable tool, it can be a headache when something goes wrong. With dozens of fault codes to parse and diagnose, it may be difficult to identify where your drive is encountering issues. To help you diagnose issues you’re having with the ACS800, we’ve composed this guide to give you a head start when troubleshooting your drive.

This is Part 3 in a five-part series. (Part 1, Part 2)




Control Board Temperature #4110

When a control board temp fault occurs, the drive’s display will show “CTRL B TEMP (4110)” on the control panel, 3rd line down.

This fault indicates that the control board temperature has gone above 88°C. The drive will shut down to keep itself safe from catastrophic failure.


  • Check that the ambient temperature is within the tolerable operating range
  • Check air flow and cooling fan operation
  • Check additional cooling fans (some drives have a smaller fan mounted near the main control board)

The main issue here is to make sure the control board’s vents are clear if the drive is enclosed in a NEMA 1 chassis, or the internal fan is running for a NEMA 12 chassis.


Slot Overlap #FF8A

For a slot overlap fault, the drive will display “SLOT OVERLAP (FF8A)” on the control panel, 3rd line down.

This fault means the drive has two option modules operating with the same connection interface selection. When they conflict with each other, the drive will show a fault.


  • Check the connection interface selections in Group 98, in the “OPTION MODULES” menu.

Go through these parameters carefully as it is easy to make a mistake here. The selections have very similar appearance and function. You may want to contact an expert technician or ABB representative for help.


Stay tuned for Part 4! If you have any questions about the ACS800 or drive fault codes, contact our experts today!


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