403

FIVE-MINUTE FULL FIELD

Otis · DSD 412 DC Elevator Drive

What does 403 mean?

The Drive and Field Enable control circuit at TB1-9 was active for 5 minutes without the drive starting. This condition can cause motor field burnout.

Common Causes

  • Drive and Field Enable control circuit at TB1-9 active for 5 minutes without a drive start command.
  • Issues with car controller relay logic preventing a drive start.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the car controller relay logic to ensure proper drive start sequencing.

  2. 2

    Verify the state of the Drive and Field Enable control circuit at TB1-9.

  3. 3

    Ensure the drive is commanded to start within 5 minutes when Drive and Field Enable is active, or disable the enable signal if the drive is not intended to start.

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Verified technical data. Last updated: March 2026

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Source: Otis DSD 412 DC Elevator Drive