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DSD 412 Isolation Transformer Selection

September 2005

Magnetek recommends:
  1. Making the nominal Vac line-line input to the drive equal to the Full Load Vdc required by the elevator motor. This will allow the drive to fully operate correctly when the power line sags down to 90% of rated, and to continue to operate without fail with several line cycles down to 80% of rated.
  2. Using a full rated Isolation Transformer rather than a buck-boost auto-transformer.
  3. The transformer secondary side should not be grounded.

For detailed guidelines: Application Note DSD 412 Isolation Transformer Selection
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