Application Examples; Introduction; Encoder Connection; Encoder Direction - Danfoss VLT Midi Drive FC 280 Design Manual

Application Examples

3 Application Examples

3.1 Introduction

3.1.1 Encoder Connection

The purpose of this guideline is to ease the set-up of
encoder connection to the frequency converter. Before
setting up the encoder, the basic settings for a closed-loop
speed control system are shown.
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Illustration 3.1 24 V Encoder
MG07B102
Design Guide
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Danfoss A/S © 03/2016 All rights reserved.
A
B
Z
A
B
Z
Illustration 3.2 24 V Incremental Encoder, Maximum Cable
Length 5 m (16.4 ft)

3.1.2 Encoder Direction

The order in which the pulses enter the frequency
converter determines the direction of the encoder.
Clockwise direction means that channel A is 90 electrical
degrees before channel B.
Counterclockwise direction means that channel B is 90
electrical degrees before A.
The direction is determined by looking into the shaft end.

3.1.3 Closed-loop Drive System

A drive system usually consists of more elements such as:
•
Motor.
•
Brake (gearbox, mechanical brake).
•
Frequency converter.
•
Encoder as feedback system.
•
Brake resistor for dynamic brake.
•
Transmission.
•
Load.
Applications demanding mechanical brake control usually
need a brake resistor.
CW
CCW
45
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