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ErrorLib — Industrial Fault Code Library

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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.

Browse all codes in this manual (58)
Verified technical data. Last updated: April 2026

Related Faults

-Initialization error (check memory unit insertion)10019Motor temperature trip (_ecMOTOR_TEMP_INPUT)10020Phase search failure (_ecPHASE_SEARCH_FAILED)
Source: Application Error ABB Motion Drives Error trouble shoo
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