Medium Voltage Drives With Reduced Footprint

Medium voltage variable frequency drive
Courtesy Siemens

Floor space, a resource most facilities managers dole out sparingly. There seldom seems to be enough for all the equipment and operations that comprise a modern industrial operation.

Siemens, globally recognized leader in the design and manufacture of variable frequency drives, offers its latest version of the Perfect Harmony GH180 variable frequency drive to reduce the required footprint by up to one third. The drive includes a transformer cabinet, cell cabinet, and cooling cabinet. Programming has been simplified and reduced, along with component count and required connections. A number of other enhancements increase reliability and reduce the need for maintenance. The units are available for medium voltage applications and come in air-cooled and water-cooled variants.

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Siemens Perfect Harmony Medium Voltage Drives from Instrument Specialties, Inc.

Advanced Cell Bypass for Variable Frequency Drives (VFDs)

Advanced cell bypass is patented technology at the Siemens Robicon drive. It allows the drive to continue operating in the unlikely event at the cell fault.

This feature is available on all Siemens Robicon drives. The unique perfect harmony topology makes it all possible.

When a drive is equipped with this feature a contact is present on the output if each other power cells. In the event of a fault the contact closes and isolates the output to the power cell.

With multiple power cells connected in series, the loss of one power cell leaves the remaining cells active, which allows the VFD to continue operating at a voltage a at least 80 percent, or up to 92 percent speed on a centrifugal load. This serial cell configuration is central to the bypass feature.

Watch the video below to learn more abut this technology.