89

Software Handshake Error

Allen-Bradley · PowerFlex 700

What does 89 mean?

A microprocessor handshake error has occurred. This indicates an internal communication or processing issue within the drive's control software/hardware, preventing proper execution.

Common Causes

  • Similar to ref 8, indicates a problem with software module communication.
  • Lost handshake packets between different software components.
  • Incorrect sequence of software commands.
  • Buffer overflow in communication stack.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Main Control Board.

Browse all codes in this manual (49)
Verified technical data. Last updated: March 2026

Related Faults