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Can TeSys T be used downstream of Altivar range Variable Speed Drive.

Article available in these languages: Finnish, Swedish

The Current Transformers (CTs) of TeSys T are deigned to work under the frequency range between 47 to 63 Hz only.

However, the output frequency range of Altivar Variable Speed Drive varies from 0 Hz to 400 Hz. So when the TeSys T is placed in the downstream of the Variable Speed Drive, the CTs of TeSys T will not be able to sense the current values correctly, as the frequency of the current is not as per design specifications.
This will affect the TeSys T working and the outcome will not be the actual.  So, it is not recommended to use the TeSys T in downstream of the Altivar Range Variable Speed Drives.

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