Danfoss VLT CDS 803 Manual page 22

VLT® Compressor Drive CDS 803
Design Guide
The CDM contains the drive controller as well as auxiliary devices and input components.
Motor control equipment = CDM or starter
Mains &
cabling
Illustration 13: Drive System Design
The efficiency classes IE0 to IE2 of the drive controller as specified in IEC 61800-9-2 (EN 50598-2) refer to the 90/100 operating point,
i.e. 90 % motor stator frequency and 100% torque current (see
Relative torque
producing current
100 %
50 %
25 %
0 %
0 % 50 % 90 %
Illustration 14: Operating Point according to IEC 61800-9-2 (EN 50598)
Since in the future all component manufacturers will disclose their loss data according to this new standard, optimized applications
can be designed with a wide range of different components. The new Standard allows an accurate preliminary calculation of the
power losses, so that the ROI (Return of Investment) can be reliably determined. Up to now the overall efficiency of speed-regulated
electric motors was estimated with the aid of approximate energy consumption calculations.
It is now possible to determine the total losses of a system for the 8 operating points defined in the standard, including the part
load operation, via a simple addition of power losses. Danfoss helps its customers to avoid having to rely on system solution provid-
ers, to ensure that their systems will retain a competitive advantage also in the future.
EC 61800-9-2 (EN 50598-2) shifts the focus from the individual component to the efficiency of the whole drive system. The new
efficiency classes (International Efficiency for Systems, IES)
allow a simple determination of the total losses for a whole drive system (PDS).
Danfoss offers the MyDrive
®
tion. Use MyDrive ecoSmart
®
• Look up part load data as defined in IEC 61800-9-2, for VLT® and VACON® drives
• Calculate efficiency class and part load efficiency for drives and power drive systems
• Create a report documenting part load loss data and IE or IES efficiency class.
For more information, refer to http://ecosmart.danfoss.com.
Refer to Illustration 15 to see the components in the PDS which contribute to losses in the design. Mains cables and the load ma-
chine are not a part of the PDS, even though their losses can be significant and could be a part of the evaluation of the overall
energy efficiency of the installation.
22 | Danfoss A/S © 2021.05
Motor Starter
(Contactor, Softstarter,...)
Vollständiges Antriebsgerät (CDM)
Complete Drive Module (CDM)
Feeding Auxiliaries
section
Module
Power Drive System (PDS)
Motor System
Extended Product
Relative
motor stator
frequency
ecoSmart tool, which is available online or as a Smartphone app to assist with the efficiency calcula-
™
to:
™
Basic
Drive
(BDM)
Illustration 14).
Product Overview
Driven Equipment
Load-
Transmis-
Machine
sion
AJ330233902305en-000201 / 130R0596