"Ex-e protection" fault Stop with inhibit

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The duration of operation below 5 Hz has been exceeded, which is critical for "Ex-e protection" compliance in hazardous environments. Prolonged operation at low frequencies can lead to motor overheating in certain certified motors, potentially creating an ignition risk.

• Drive parameter P5-25 (Minimum Motor Frequency) set below 5 Hz or not enabled for Ex-e protection mode.
• Motor operating profile frequently demands speeds below the 5 Hz Ex-e protection threshold for extended durations (e.g., >30 seconds).
• Inadequate cooling of the motor at low speeds, leading to hotspot formation not detectable by standard sensors.
• Drive control logic error causing the motor to dwell below 5 Hz for extended periods due to improper programming.
• Motor is not certified for Ex-e operation at low frequencies, or the application exceeds its thermal limits at these speeds.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   1. Verify parameter P5-25 (Minimum Motor Frequency) is set correctly to enforce a minimum of 5 Hz for Ex-e motor protection.

2. 2

   2. Analyze the machine's operation profile to identify if sustained low-speed operation (below 5 Hz) is inherent and modify the process.

3. 3

   3. Check the motor cooling fan for proper operation and ensure all ventilation paths are clear and unobstructed.

4. 4

   4. Measure the motor winding resistance (e.g., U-V, V-W, W-U) to detect any imbalances or hotspots, comparing to nameplate data.

5. 5

   5. If the operating profile absolutely requires low speeds, confirm the motor is rated for 'Ex-e' with appropriate additional cooling or specific protection measures.