ABB ACH550 Error 3027: INVALID SUB ASM

AC drive · taken from the manufacturer’s manual, pages cited

Fault code3027

INVALID SUB ASM means an incompatible RBCU unit was installed after firmware change. The manual's first action is: “Contact ABB at 1-800-HELP-365 Option 4”

Model
ABB ACH550
Display shows
INVALID SUB ASM (3027)
Type
Fault code
Source
Manual p. 69

What 3027 means

INVALID SUB ASM p. 69

Common causes

  • RBCU unit from a different size bypass used to replace a defective RBCU. Parameters not matched after Firmware change. p. 69

What to do

  1. Contact ABB at 1-800-HELP-365 Option 4 p. 69

Before you service the product, read the safety instructions in the manual p. 2.

If 3027 is still not resolved

  • contact the factory or your local Authorized Service Center for repair or replacement. p. 2
    “Never attempt to repair a malfunctioning ACH550; contact the factory or your local Authorized Service Center for repair or replacement.”
Open the manual at page 69 All ACH550 error codes Manual details & download

This page summarises what the manufacturer’s manual says about 3027; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with ABB. Found a mistake? Report an error.