Danfoss VLT CDS 303 User Manual

6.14 Par. Group 25 - Cascade Controller
Parameters for conguring the Basic Cascade Controller for
sequence control of multiple compressors.
Figure 6.24 Cascade Controller Feedback Signals
To congure the Cascade Controller to the actual system
and the desired control strategy, it is recommended to
follow the below sequence, starting with parameter group
25-0* System Settings, and next parameter group 25-5*
Alternation Settings.These parameters can normally be set
in advance.
Parameters in parameter group 25-2* Bandwidth Settings
and 25-4* Staging settings will often be dependent on the
dynamic of the system and nal adjustment to be done at
the commissioning of the plant.
NOTICE!
The Cascade Controller is supposed to operate in closed
loop controlled by the built-in PI controller ([1] Speed
Closed Loop selected in parameter 1-00 Conguration
Mode). If [0] Speed Open Loop is selected in
parameter 1-00 Conguration Mode, all xed speed
compressors will be destaged, but the variable speed
compressor will still be controlled by the frequency
converter, now as an open loop conguration:
Figure 6.25 Conguring the Cascade Controller
Parameter Descriptions
VLT
®
Compressor Drives CDS 302/CDS 303
112 Danfoss A/S © Rev. 2013-07-03 All rights reserved. MG34M422
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Danfoss VLT CDS 303 Specifications

General

Brand	Danfoss
Model	VLT CDS 303
Category	DC Drives
Language	English