What causes an EPHO (Output Phase Loss) fault on an Altivar ATV212 drive?

An EPHO fault on an Altivar ATV212 drive indicates that one or more motor output phases are missing. This condition can prevent proper motor operation and must be corrected before restarting the drive.

Common Causes

• The drive is connected to a single-phase motor (ATV212 drives require a 3-phase motor).
• Loose or damaged wiring between the drive and motor.
• An open circuit in one motor winding.
• An output contactor or disconnect switch opened while the drive is running.

Recommended Actions

1. Verify motor type
   Ensure the motor is a 3-phase motor. ATV212 drives are not designed for single-phase motor operation.

2. Inspect output wiring and connections
   Check for loose terminals, damaged cables, or disconnected phases between the drive and motor.

3. Check motor condition
   Test the motor windings for continuity to rule out an internal open phase.

4. Review parameter F605 (Output Phase Loss Detection)

   • Set F605 = 0 (Disabled) if using a bypass contactor, as phase loss detection may trigger during switching.
   • F605 may also be temporarily disabled for troubleshooting purposes.

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

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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.

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