How can I troubleshoot a bLF fault on an Altivar 312 or Altivar 31?

A bLF fault indicates that the brake release current was not reached.

To troubleshoot this fault:

• Check the drive-to-motor wiring connections.
• Verify the condition of the motor windings.
• Review the [Brake release I FW] (Ibr) setting in the [APPLICATION FUNCT.] (FUn-) menu and ensure it is configured correctly for the application.
• Verify and apply the recommended settings for [Brake engage freq] (bEn).

If the fault persists, inspect the motor and brake system for any conditions that could prevent the required brake release current from being achieved.

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:

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