Undersized Compressor; Application Features; Automatic Motor Adaptation (Ama); Motor Thermal Protection - Danfoss VLT CDS 803 Manual

VLT® Compressor Drive CDS 803
Design Guide

3.2.1.7 Undersized Compressor

Programmable compressor choices allow downscaling of a drive to operate with an undersized compressor or running an oversized
drive under extreme conditions. This functionality is useful in applications which are outside the specified appliance area:
• High ambient temperature installations.
• High altitude installations.
UL 60730-1 certification restricts for only allowing 1 dedicated compressor combination and does not offer the ability to run an
undersized compressor.

3.2.2 Application Features

The VLT® Compressor Drive CDS 803 offers custom application functions for enhanced performance.

3.2.2.1 Automatic Motor Adaptation (AMA)

Automatic motor adaptation (AMA) is an automated test procedure used to measure the electrical characteristics of the motor. AMA
provides an accurate electronic model of the motor, allowing the drive to calculate optimal performance and efficiency. Running
the AMA procedure also maximizes the automatic energy optimization feature of the drive.
AMA is performed without the motor rotating and without uncoupling the load from the motor.
Automatic motor adaptation (AMA) is not required when used with a VZH Danfoss compressor.

3.2.2.2 Motor Thermal Protection

Motor thermal protection can be provided via:
• Mechanical thermal switch (Klixon type) on a DI.
• Built-in electronic relay (ETR).
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