Operating instructions

3.23 Main Menu - Cascade Controller -

Group 25

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 Guide.

To configure 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 parameter 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.

NOTE

The Cascade Controller is supposed to operate in closed

loop controlled by the built-in PI controller (Closed Loop

selected in Configuration Mode, par. 1-00 Configuration

Mode). If Open Loop is selected in par. 1-00 Configuration

Mode, all fixed speed pumps will be destaged, but the

variable speed pump will still be controlled by the

frequency converter, now as an open loop configura-

tion:

Parameter Description

VLT

HVAC Drive Programming Guide

MG.11.CA.02 - VLT

is a registered Danfoss trademark 167