How to Fix ABB ACS850 Fault 66 Cooling & Overheating Guide

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Staring at Fault 66 on your ABB ACS850? Learn what the Cooling fault means, how to check your fans, and the specific parameters to clear the error.

How to Fix ABB ACS850 Fault 66 Cooling & Overheating Guide

 

Solving ABB ACS850 Fault 66: The Cooling & Overheating Guide

If your ABB ACS850 drive has tripped with Fault 66 (COOLING), it means the drive module’s internal temperature has exceeded its safety limit. This isn't just a random error; it is a critical "Stop" command to prevent the power electronics (IGBTs) from melting.

In this guide, we will look at why your ACS850 is running hot and the exact steps to get it back into the safe zone.

What Exactly Causes Fault 66?

When the drive displays 0066 COOLING, it’s usually because of one of the following "Real World" issues:

  • Blocked Airflow: Dust and lint have built up on the heatsink fins or cabinet filters.
  • Fan Failure: The main cooling fan at the bottom of the drive is stuck, slow, or has died.
  • Ambient Temperature: The room or cabinet temperature is higher than 40°C (104°F).
  • Parameter Mismatch: The drive's internal ambient temperature setting doesn't match the actual environment.

Step-by-Step Troubleshooting for Fault 66

1. The "Physical Flow" Test

Before touching any parameters, check the physical drive:

  • Check the Fan: Put your hand near the exhaust at the top of the drive. Do you feel a strong breeze? If there is no air moving, the fan is likely dead or jammed.
  • The Dust Check: Use a flashlight to look at the heatsink fins. If they are matted with dust, the drive cannot shed heat. Blow them out with clean, dry compressed air.
  • Cabinet Filters: If the drive is in a panel, check the intake filters on the cabinet door. If they are clogged, the drive is just "breathing" its own hot air.

2. Check Ambient Settings (Parameter 95.03)

The ACS850 has a setting that tells it what the expected room temperature is.

  • Go to Parameter 95.03 (Temp inu ambient).
  • Ensure this value is set correctly for your location. If this is set too low while the room is actually hot, the drive will be overly sensitive and trip Fault 66 prematurely.

3. Monitor Actual Temperature (Parameter 01.15)

You can see exactly how close the drive is to its limit.

  • Look at Parameter 01.15 (Ambient inverter). This shows the temperature percentage relative to the trip limit.
  • If this value is consistently above 90%, you need to improve the cabinet cooling or derate the motor load.

4. Check for Overloading

If the drive is clean and the fans are spinning, you might be pulling too much current. High current equals high heat. Check if the motor is drawing more than its rated Amps or if the drive is undersized for the application.

How to Reset Fault 66

  1. Clean the heatsinks and filters.
  2. Wait! You cannot reset Fault 66 until the internal temperature drops below the trip threshold. Let the drive sit for 10–15 minutes.
  3. Press the RESET button on the control panel.
  4. If the fault returns immediately, verify that the 24V supply to the cooling fan is present.

Preventive Maintenance Tip

To avoid seeing Fault 66 again, set a quarterly schedule to vacuum your drive cabinet and check fan rotation. Cooling fans on ACS850 drives are considered "consumables" and typically need replacement every 3 to 5 years in heavy-duty applications.

Summary

The ABB ACS850 66 COOLING fault is usually a maintenance issue rather than a hardware failure. Keep the airflow clear, ensure your ambient settings in Group 95 are correct, and don't let the dust win!

 

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