10021

Hall signals lost or incorrect (_ecHALL_SIGNAL_LOSS)

ABB · Application Error ABB Motion Drives Error trouble shoo

What does 10021 mean?

This error occurs when the drive is configured for "Halls only" or "Encoder + Halls" feedback and detects an illegal Hall sensor state (0 or 7). This typically points to a faulty encoder (which often simulate Hall signals) or incorrect wiring.

Common Causes

  • Faulty encoder in the motor, specifically issues with simulated Hall signals.
  • Damaged or incorrectly wired motor encoder cabling.
  • Poor quality of installation, leading to loose connections or electrical noise affecting Hall signals.
  • Incorrect encoder type selection in the drive parameters (e.g., expecting Hall signals when not provided).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the motor encoder wiring and connections for damage, loose terminals, or improper shielding.

  2. 2

    Verify that the selected encoder type in the drive's parameters accurately reflects the motor's feedback device (Halls only or Encoder + Halls).

  3. 3

    Use Mint Workbench to scope the Encoder Hall State to look for problems with signal integrity and transitions.

  4. 4

    Check the encoder for physical damage or internal faults that could cause illegal Hall states.

  5. 5

    Ensure proper grounding and shielding of the encoder cable as per the drive installation manual to prevent noise interference.

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Verified technical data. Last updated: March 2026

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Source: Application Error ABB Motion Drives Error trouble shoo