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
Replace the Main Control Board.
Verified technical data. Last updated: March 2026
Related Faults
Source: Allen-Bradley PowerFlex 700