Cause: AFE Current Control Error comes when mains voltage interruption. An "AFE current control error" generally indicates a problem with the drive's ability to accurately regulate the current flowing through the motor. This can lead to various issues, such as motor overheating, reduced performance, or even drive failure.

"ACF2" fault in Schneider ATV950 drive indicate an "AFE Current Control Error". This means the supply voltage has been lost or interrupted. This can lead to the drive shutting down or malfunctioning.

Here are steps to troubleshoot and address this issue:

1. Inspect Power Supply:

• Measure Voltage: Use a multimeter to check the voltage at the input terminals of the drive. Ensure that the voltage is within the acceptable range.
• Power Source: Verify that the power source is stable and not subject to frequent interruptions.

2. Examine Wiring and Connections:

• Secure Connections: Check all electrical connections for tightness and security. Loose or corroded connections can cause intermittent power loss.
• Cable Condition: Inspect the input power cables for any damage or wear that could lead to interruptions.

3. Check Circuit Breakers and Fuses:

• Proper Ratings: Ensure that circuit breakers and fuses in the supply line are correctly rated and functioning properly.
• Tripping: Check if any circuit breakers are tripping or if fuses are blown, which could indicate an issue with the power supply.

4. Monitor Power Quality:

• Voltage Fluctuations: Use a power quality analyzer to check for voltage dips, spikes, or other disturbances that could cause interruptions.
• Stabilizers: Consider installing voltage stabilizers or uninterruptible power supplies (UPS) to mitigate the effects of power quality issues.

5. Evaluate Load Conditions:

• Sudden Changes: Ensure that the drive is not experiencing sudden changes in load that could affect the power supply.
• Overload: Check if the drive is overloaded, which could cause it to draw more current and affect the power supply stability.