Power card temperature

What does ALARM 69 mean?

The temperature on the frequency converter's power card is outside its acceptable operating range (either too high or too low). Extreme temperatures can lead to premature component failure or immediate drive shutdown to prevent damage.

• Blocked cooling air vents or heatsinks, preventing proper heat dissipation from the power card.
• Failed cooling fan (e.g., seized, not rotating, low RPM) within the frequency converter.
• Excessive ambient temperature in the control cabinet or operating environment, exceeding drive limits.
• Drive cabinet ventilation fan failure or insufficient cooling, resulting in heat accumulation.
• Sustained operation at high loads or with highly dynamic cycles without sufficient cooling.
• Internal power card temperature sensor fault or drift.

Click steps to track your progress.

1. 1

   Check the drive's cooling fan operation; verify it spins freely and replace if seized or noisy.

2. 2

   Inspect all cooling air vents and heatsinks for dust, debris, or blockages, and clean them thoroughly.

3. 3

   Measure the ambient air temperature inside the control cabinet and around the drive; ensure it is within specified limits.

4. 4

   Verify motor nominal current (P1-21) and motor nominal power (P1-22) are correctly set, and AMA has been performed.

5. 5

   Ensure the drive is not undersized for the application, leading to continuous high current draw.

6. 6

   For low temperature, consider adding cabinet heating or temporary shielding for cold startup.