Schneider ATV310 Error F020 IGBT Short Circuit

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Getting the F020 error on your Schneider Altivar ATV310 drive? Learn why this internal short circuit occurs at power-on and how to diagnose hardware failure.

Schneider ATV310 Error F020 IGBT Short Circuit

 

The Schneider Electric Altivar ATV310 is a popular, cost-effective drive, but like all VFDs, it is susceptible to hardware fatigue. If you flip the power switch on and are immediately greeted by Fault F020, the drive has failed its internal safety check.

F020 specifically indicates an Internal power component short circuit detected at power-on. In plain English: the drive's "muscles" (the IGBT transistors) are damaged and cannot safely send power to the motor. Here is what you need to know about this critical error.

What Exactly is an IGBT Short Circuit?

The IGBT (Insulated Gate Bipolar Transistor) is the component responsible for switching power to the motor at high speeds. When the ATV310 powers up, it performs a micro-second test to ensure these switches are "open." If the drive senses that electricity is flowing through them even when they are supposed to be off, it triggers F020 to prevent a catastrophic electrical fire or further damage to your power supply.

Common Causes of F020

  • Component Failure: Thermal fatigue from years of high-load operation.
  • Moisture or Contamination: Conductive dust (like metal shavings) or humidity inside the drive casing causing a bridge between components.
  • Severe Output Short: A previous massive short circuit in the motor cables that was so violent it physically "blew" the internal transistors.
  • Manufacturing Defect: Rare, but possible in brand-new units that haven't been commissioned yet.

Step-by-Step Diagnostic Guide

Safety Warning: VFDs contain high-voltage DC capacitors. Always disconnect the main power and wait at least 15 minutes for the energy to dissipate before touching any terminals.

1. The "Clean Start" Test

Occasionally, an F020 can be a "ghost" fault caused by extreme electrical noise on the line during startup.

  • Turn off the power.
  • Wait for the display to go completely blank.
  • Turn the power back on. If the fault reappears instantly, it is a permanent hardware failure.

2. Isolate the Drive (The Motor-Off Test)

You need to determine if the short is actually inside the drive or if the drive is being "tricked" by the motor cabling.

  • Disconnect the motor leads (U, V, W) from the bottom of the ATV310.
  • Power up the drive with nothing connected to the output.
  • If F020 still appears: The drive's internal power module is definitely dead.
  • If the error changes or disappears: You may have a severe grounding issue or a dead short in your motor cables.

3. Static Diode Test (For Advanced Users)

If you have a digital multimeter, you can confirm the IGBT failure by performing a diode test:

  1. Set your meter to Diode Mode.
  2. Place the Positive probe on the PA/+ terminal and the Negative probe on U, V, and W one by one. Then reverse them.
  3. Repeat the process using the PC/- terminal.
  4. The Result: If you see a reading of 0.000 (a dead short) in both directions on any phase, the IGBT is physically melted inside.

The Remedy: Can it be Fixed?

Unfortunately, for the Schneider ATV310 series, Fault F020 is generally not field-repairable.

The power module is integrated into the main board in these compact units. Attempting to de-solder and replace individual IGBTs is often more expensive than replacing the entire drive.

  • If Under Warranty: Contact your Schneider Electric distributor immediately for a replacement.
  • If Out of Warranty: The most reliable path is to purchase a new unit. Continuing to use a drive with an IGBT fault can lead to more severe electrical issues in your control cabinet.

How to Prevent Future F020 Errors

To ensure your next drive lasts longer, follow these three tips:

  1. Improve Ventilation: Heat is the #1 killer of IGBTs. Ensure your cabinet has clean filters and working fans.
  2. Check Motor Insulation: Use a Megger to test your motor. A motor with weak insulation puts constant stress on the VFD.
  3. Use Line Reactors: If your power grid is unstable, a line reactor can protect the drive from voltage spikes that weaken internal components.

 

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