50

Analog Input Current Below 4mA

Vacon · NX All-in-One Application

What does 50 mean?

The analog input configured for a 4-20 mA signal range is receiving a current signal below 4mA. This suggests a problem in the current loop, such as a broken or loose control cable, or a failure of the signal source itself, preventing accurate control or feedback.

Common Causes

  • Analog input module failure or incorrect wiring for current loop (e.g., P1-02).
  • Sensor malfunction reporting a current below the minimum threshold (e.g., 4mA).
  • Open circuit in the analog input loop.
  • Faulty analog input card or module.
  • Incorrect parameter setting for analog input range (e.g., P1-04).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the entire 4-20 mA current loop circuitry, including the signal source, wiring, and input terminals on the drive, for breaks, loose connections, or component failures.

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Verified technical data. Last updated: March 2026

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Source: Vacon NX All-in-One Application