Danfoss VLT AQUA Operating Instructions Manual page 7

Introduction
by a frequency converter or connected to a contactor or a
soft starter.
1 1
Additional frequency converters in the system (follower
drives) do not need any Cascade Controller option card.
They are operated in open loop mode and receive their
speed reference from the master drive. Pumps connected
to follower drives are referred to as variable speed pumps.
Pumps connected to mains through a contactor or
through a soft starter are referred to as fixed speed
pumps.
Each pump, variable speed or fixed speed, is controlled by
a relay in the master drive.
The Cascade Controller options can control a mix of
variable speed and fixed speed pumps.
Other resources are available to understand advanced
functions and programming.
•
The VLT
Instructions provide details on installation and
operation of the frequency converter.
•
The VLT
Guide provides greater detail on working with
parameters and many application examples.
•
The VLT
provides detailed capabilities and functionality to
design motor control systems.
•
Supplemental publications and manuals are
available from Danfoss.
See www.danfoss.com/BusinessAreas/DrivesSo-
lutions/Documentations/Technical
+Documentation.htm for listings.
•
Optional equipment may change some of the
procedures described. Reference the instructions
supplied with those options for specific
requirements. Contact the local Danfoss supplier
or visit the Danfoss website: www.danfoss.com/
BusinessAreas/DrivesSolutions/Documentations/
Technical+Documentation.htm, for downloads or
additional information.
4
VLT
®
AutomationDrive FC 302Operating
®
AutomationDrive FC 302 Programming
®
AutomationDrive FC 302 Design Guide
MI38C402 - VLT
®
AQUA Drive MCO 101/MCO 102
®
is a registered Danfoss trademark