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# Inverter Drive Setting4

## Inverter Drive Setting

(OP)
Hello

I am doing the configuration of a VFD and in the "select control mode" there are 3 options
1. SVC control
2. FVC control
3. V/F control

What are the first 2?

### RE: Inverter Drive Setting

The "VC" in 1 and 2 stands for "vector control". This is closed-loop control of the motor as opposed to the open-loop V/F (voltage/frequency) control of 3.

As to the first letter, different companies use different terminology. "S" is probably for "Space" as "Space Vector Control" is a term often used. "F" may refer to "Flux".

Usually, the biggest difference between different vector control algorithms is whether they use a shaft position sensor or estimate the shaft angle from various electrical properties and a good mathematical model of the motor. You will probably have to consult the VFD mode to see what they are talking about.

Curt Wilson
Omron Delta Tau

### RE: Inverter Drive Setting

It's simulated and full vector control for 1 and 2. Full vector control require a shaft encoder \$. Modern drives have good torque characteristics in simulated vector but if you're using the drive for a hoist or need best low speed performance you'll still need an encoder.

V/F is volts /frequency. It's the simplest control format but has poor starting torque. It's acceptable for small fan and centrifugal pump applications.

### RE: Inverter Drive Setting

2
https://www.eng-tips.com/faqs.cfm?fid=1062

Re-reading that 18 years later, I was reminded of my friend Gunnar (skogsgurra) with whom I collaborated on that. I miss him. RIP.

" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

### RE: Inverter Drive Setting

(OP)

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