Why does an Altivar Process drive display an INFL error (Internal error 21), and how can I fix it?

Resolution:
INFL is a real time clock fault. This could be caused by a communication error between the keypad and the drive.

To reinitialize the communication, follow these steps:

1. Power off the drive.
2. Disconnect the keypad from the VFD and remove the battery of the keypad (you can find the battery at the bottom of the keypad under the plastic cover).
3. Re-connect the keypad (without the battery).
4. Power on the drive.

• If the INFL (INF21) fault is no longer displayed, power off the drive, reinstall the battery in the keypad, and power the drive back on.
  • If the fault reappears after resetting the clock, or if any other INFL fault is reported, replace the keypad battery and test again.

• If the INFL (INF21) fault remains active, test the keypad (VW3A1111) on another drive and/or connect a known-good keypad to the affected drive.
  • If the fault follows the keypad and a known-good battery is installed, replace the keypad.

• If the previous troubleshooting steps do not resolve the issue, update the drive firmware to one of the versions listed below or a newer version.

• For ATV600: Download and install firmware version V4.6IE47
• For ATV900: Download and install firmware version V4.6IE42
• For ATV340: Download and install firmware version V4.6IE39

If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:

Frequently Asked Questions - Schneider Electric (se.com)

If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us atdrive.products.support@se.comto create a case with our Technical Support Team.

If you are not located in North America, please contact your local Customer Care Center for assistance:

Support | Schneider Electric Global (se.com)

Released for: Schneider Electric Canada