PtFL

PTCL Detected Error (OC/SC)

Schneider Electric · Altivar Machine ATV320 Variable Speed Drive

What does PtFL mean?

A PTCL (Positive Temperature Coefficient Logic) detected error, indicating either an open circuit (OC) or short circuit (SC) in the PTC probe circuit connected to logic input LI6. This prevents the drive from accurately monitoring motor temperature, risking motor overheating.

Complete Troubleshooting Guide

  1. 1

    Check the wiring connections for the PTC probe to logic input LI6 for continuity and correct polarity.

  2. 2

    Measure the resistance of the PTC probe (when motor is cool) to ensure it's within specifications.

  3. 3

    Inspect the PTC probe and its cable for physical damage or insulation breakdown.

  4. 4

    Ensure the LI6 input is correctly configured in the drive for PTC probe monitoring.

Source: Schneider Electric Manual