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TECHNICAL BULLETINS

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VFD Application Guidelines

Details

VFD APPLICATION GUIDELINES 

Background 

The application of variable frequency drives (VFDs) in heating and cooling units is becoming more common every day. Colmac’s experience has shown that there are several design considerations that must be accounted for in order for these applications to be successful. This is particularly important with regard to extending motor life by reducing the potential causes of bearing currents and insulation breakdown that can arise with the use of VFDs. 

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