Introduction - Danfoss VLT CDS302 Operating Instructions Manual

Introduction

1 1
1 Introduction
Illustration 1.1 Compressor Drive System
The Compressor Drive
design and manufacturing expertise. Our extensive
application knowledge of Refrigeration, Air Conditioning
and Motion Controls ensures an optimised product design
and package solution:
•
One package "plug & play" solution.
•
Operation efficiency.
•
Flexibility & best control accuracy.
•
Innovative and reliable solution.
The frequency converter is 100% pre-set for speed open
loop configuration with 0-10 V reference corresponding to
1800 to 5400 RPM for CDS302 and 1500 to 6000 RPM for
CDS303.
4
Operating Instructions VLT
®
utilises and combines Danfoss
®
MG34M302 - VLT is a registered Danfoss trademark/Commercial Compressor
®
CDS302 and CDS303
The dedicated frequency converter functionality includes:
•
Start Up
Once the frequency converter has a start
command, the compressor runs up to 3000 RPM
and remains at that speed for 10 s. Once this
initial time is complete, the frequency converter
slowly ramps to the reference speed.
•
Shut Down
The stop command bypasses the normal ramp
time and the frequency converter ramps the
compressor to stop fast.
•
Short Cycle Prevention
The frequency converter has a minimum running
time of 12 s, with an interval between starts of 5
minutes (300 s). The short cycle delay values are
adjustable in parameter group 28-0* Short Cycle
Protection.