This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
When the motor is controlled by a variable speed drive (VSD):
- The current transformers (external or internal) must be mounted upstream of the variable speed drive, and not between the variable speed drive and the motor. The CTs cannot be used between the drive
outputs and the motor because the drive can output fundamental frequencies outside the 47-63 Hz range.
- Chokes must be mounted on the three phases, between the current transformers (external or internal) and the variable speed drive, to minimize the soft start harmonics current and the voltage disturbances
generated by the variable speed drive.
- The current transformers (external or internal) must be mounted upstream of the variable speed drive, and not between the variable speed drive and the motor. The CTs cannot be used between the drive
outputs and the motor because the drive can output fundamental frequencies outside the 47-63 Hz range.
- Chokes must be mounted on the three phases, between the current transformers (external or internal) and the variable speed drive, to minimize the soft start harmonics current and the voltage disturbances
generated by the variable speed drive.
Released for:Schneider Electric Egypt and North East Africa
