The Cascade Controller option provides the capability to control multiple pumps configured in parallel in a way that makes them appear as a single larger

pump.

When using Cascade Controllers, the individual pumps are automatically turned on (staged) and turned off (de-staged) as needed in order to satisfy the

required system output for flow or pressure. The speed of pumps connected to VLT Automation VT Drive is also controlled to provide a continuous range

of system output.

Illustration 3.24: Cascade control of multiple pumps

The Cascade Controllers are optional hardware and software components that can be added to the VLT Automation VT Drive. It consists of an option

board containing 3 relays that is installed in the B option location on the Drive. Once options are installed the parameters needed to support the Cascade

Controller functions will be available through the control panel in the 27-** parameter group. The Extended Cascade Controller offers more functionality

than the Basic Cascade Controller. It can be used to extend the Basic Cascade with 3 relays and even to 8 relays with the Advanced Cascade Control card

installed.

While the Cascade controller is designed for pumping applications and this document describes the cascade controller for this application, it is also possible

to use the Cascade Controllers for any application requiring multiple motors configured in parallel.

MG.20.X1.22 - VLT

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Automation VT Drive FC322 Design Guide

is a registered Danfoss trademark

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