Variable Frequency Drive Components; Vfd Modules; Vfd Control Card; Figure 170 - Vfd - Danfoss Turbocor VTT Series Service Manual

Variable twin turbo compressors

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Variable Frequency Drive Components

A VFD is an electronic motor controller that converts DC into a variable AC waveform output. The

frequency and voltage of the output are regulated to control the motor speed or torque. The VFD can

vary the speed of the motor in response to commands from the CCM.

There are three (3) VTT VFD Modules specifically designed and programmed to operate with the VTT

Compressor Module and cannot be replaced by a generic drive. The following VFDs are designed to be

used with the VTT Compressor Module:

• N165

• N232

• N262

For detailed VFD information, refer to the VFD Service Manual.

The VFD Control Card contains most of the logic section. The primary logic element of the VFD Control

Card is a microprocessor, which supervises and controls all functions of frequency converter operation.

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