VFD General

Variable Frequency Drives (VFDs)

Variable Frequency Drives are commonly used to move our machines to a specific position. They allow the motor to run at variable speeds, smoothly ramping up and ramping down as needed.

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Control Wiring (Motion Control)

When a VFD is used for controlled movement, there are typically four control wires:

Function	Wire Color
Run / Stop	Green
Forward / Reverse	White / Green
Frequency (Speed) Input	Orange
Common / Ground	Brown

These four wires are present on every VFD that is controlled using this method.

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Communication Wiring

Two additional wires may be used for RS-485 communication with the VFD:

Function	Wire Color
RS-485 (+)	Blue
RS-485 (–)	White / Blue

These communication wires may connect directly to terminal blocks on the VFD, or they may be terminated with an RJ45 or RJ11 connector, depending on the VFD model.

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Cabling

All of the above signals are typically run through a single shielded, stranded Cat5/Cat6 cable.
Any remaining unused wires in the cable can be reserved for future use or alternate functions.

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Control Panel Connection (VC1)

The opposite end of this cable connects to the VC1 controller, which issues the commands needed to drive the VFD and control motion.

Enventek supports multiple VFDs see Replacement article for supported VFDs