The Sinamics Perfect Harmony GH180 variable frequency drives have medium-voltage power output for critical applications and is created by linking a series of low-voltage power cells. This modular design also facilitates Advanced Cell Bypass, which allows the drive to maintain consistent output if one or more cells fail. In the event of a fault, the drive isolates the output of the failed cell and reconfigures the power section to bypass the cell without interrupting performance - all in less than a quarter of a second. The quality of the voltage waveform remains unchanged even when only a single cell per phase remains operational. An integral transformer with phase-shifted secondaries provides 18-pulse or better input harmonic cancellation. Synchronous transfer provides a bumpless transition when starting a series of multiple motors, pumps, or compressors and transferring them across the line.