Danfoss VLT Midi Drive FC 280 Design Manual page 20

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Product Overview

works for 2 directions. The torque is calculated

from the internal current measurement in the

frequency converter.

Speed/torque reference

The reference to these controls can be either a single

reference or the sum of various references including

relatively scaled references. Reference handling is explained

in detail in chapter 2.4 Reference Handling.

Process control

There are 2 types of process control:

•

Process closed-loop control, which runs speed

open-loop to control the motor internally, is a

basic process PID controller.

•

Extended PID speed open-loop control, which

also runs speed open-loop to control the motor

internally, extends the function of the basic

process PID controller by adding more functions.

For example, feed forward control, clamping,

reference/feedback filter, and gain scaling.

VLT

Midi Drive FC 280

MG07B102

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