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VFD Derating

Derating a variable frequency drive means using a larger than normal VFD in the application. Derating is required when a VFD is to be operated outside the normal operating range specified by the manufacturer. Most VFD manufacturers provide derating figures when the VFD is to be operated outside the specified temperature, voltage, & altitude. As an example, derating must be considered when the VFD is installed at high altitude, greater than 1000 meters (3300 ft.). The cooling effect of the VFD is deteriorated because of the reduced density of the air at high altitudes (see details of how to derate a VFD?).

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