Encoder Connection; Encoder Direction; Closed Loop Drive System - Danfoss VLT AutomationDrive FC 360 Design Manual

Application Examples

6.1.1 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.
12 18 19 27
Illustration 6.2 24 V or 10-30 V Encoder
A
B
A
B
Illustration 6.3 24 V Incremental Encoder, Maximum Cable
Length 5 m
MG06B402
Design Guide
29 32 33 20
CW
CCW
Danfoss A/S © 09/2014 All rights reserved.

6.1.2 Encoder Direction

The direction of the encoder is determined by which order
the pulses are entering the frequency converter.
Clockwise direction means channel A is 90 electrical
degrees before channel B.
Counter Clockwise direction means channel B is 90
electrical degrees before A.
The direction is determined by looking into the shaft end.

6.1.3 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 braking.
•
Transmission.
•
Load.
Applications demanding mechanical brake control usually
need a brake resistor.
Motor
Encoder Mech. brake
Illustration 6.4 Basic Set-up for Closed-loop Speed Control
Brake resistor
Transmission
Gearbox
Load
81
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