Altivar shows negative 60hz but motor runs forward

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Altivar shows negative frequency but motor runs forward

Issue:
How can you correct an issue where the motor runs forward but the display is showing negative frequency?

Product Line:
Altivar and Altivar Process Drive

Environment:
All models Altivar Drives

Cause:
Incorrect Wiring

Resolution:
The motor phasing is incorrect. This requires the drive to send a Reverse Run command to the drive (indicate by the negative frequency) to get the motor to run in the correct direction.
To resolve this swap any 2 motor leads and then command a Forward Run.

Note, if the drive system has a bypass option, you'll need to ensure the direction of rotation in bypass is also correct.
- If the direction is correct in Bypass but incorrect in drive mode the motor leads need to be switched on the T terminals of the drive.
- If the direction is correct in drive mode but incorrect in bypass, 2 phases need to be switched at the incoming power to the system or Input of Bypass Contactor.
- If the direction is incorrect both Drive and Bypass mode, 2 phases need to be switched at the motor connection.

Some drives have a parameter that allows you to change the Output Phase Rotation (PHR in the ATV600, 900 and 340 drives). This can be useful for testing, but it is recommended that the connections physically be changed to provide correct direction, since the parameter change will be lost if the drive is ever reset to defaults.

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 at drive.products.support@se.com to create a case with our Technical Support Team.

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