Illustration 4.5 Encoder Connection to the Frequency Converter
B
A
B
A
130BA646.10
CW
CCW
Illustration 4.6 24 V Incremental Encoder with Maximum Cable
Length 5 m
4.2 Encoder Direction
The direction of encoder is determined by which order the
pulses are entering the drive.
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 determined by looking into the shaft end.
4.3 Closed Loop Drive System
A closed loop drive system usually comprises elements
such as:
•
Motor
•
Add
(Gearbox)
(Mechanical Brake)
•
Frequency converter
•
Encoder as feed-back system
•
Brake resistor for dynamic braking
•
Transmission
•
Load
Applications demanding mechanical brake control will
usually need a brake resistor.
130BC996.10
3
4
7
5
6
ON
WARNING
ALARM
Bus MS
NS2
NS1
1
2
Illustration 4.7 Basic Set-up for Closed Loop Speed Control
Item
Description
1
Encoder
2
Mechanical brake
3
Motor
4
Gearbox
5
Transmission
6
Brake resistor
7
Load
Table 4.15 Legend
4.4 PID Control
Application Examples
VLT
®
Decentral Drive FCD 302
52
MG04H102 - VLT
®
is a registered Danfoss trademark
4
4
Содержание vlt fcd 302
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