Compressor Minimum Speed Detection - Danfoss VLT CDS 803 Manual
Compressor drive
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Also See for VLT CDS 803:
- Programming manual (92 pages) ,
- Design manual (82 pages) ,
- Operating manual (54 pages)
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VLT® Compressor Drive CDS 803
Design Guide
Speed
Start
speed
Speed
Compressor
start minimum
speed
A18, Start
failed
Compressor start
maximum time to trip
Illustration 2: Compressor Start-up Sequence
3.2.1.2 Compressor Minimum Speed Detection
To avoid a malfunction inside the compressor due to missing or low lubrication the VLT® Compressor Drive CDS 803 protects the
compressor if the speed drops below the minimum speed detection limit for too long.
•
In case of excessive low speed the drive issues Alarm 49, Speed limit.
Speed
Motor speed
low limit
Compressor
minimum
speed for trip
Minimum
speed
detection
timer start
Illustration 3: Minimum Speed Detection
Danfoss A/S © 2021.05
Start-up sequence
Time
Time
AJ330233902305en-000201 / 130R0596 | 13
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