Parameters 25-** Cascade Controller - Danfoss VLT AQUA Drive FC 200 Programming Manual

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Parameter Description
VLT AQUA Drive Programming Guide

3.22 Parameters 25-** Cascade Controller

Parameters for configuring the Basic Cascade Controller for sequence control of multiple pumps. For a more application
oriented description and wiring examples, see Chapter Application Examples, item Basic Cascade Controller in the Design
3 3
Guide, MG20N.
To configure the Cascade Controller to the actual system and the desired control strategy, it is recommended to follow the
sequence below, 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 25-2* Bandwidth Settings and 25-4* Staging settings, will often be dependent on the dynamic of the system
and final 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 (Closed-loop selected in
1-00 Configuration Mode). If Open-loop is selected in 1-00 Configuration Mode, all fixed-speed pumps will be destaged, but
the variable-speed pump will still be controlled by the adjustable frequency drive, now as an open-loop configuration:
Figure 3.65
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