Supported Configuration; Introduction - Danfoss MCO 101 Manual

Extended and Advanced Cascade Controller
Option

3 Supported Configuration

3.1.1 Introduction

The extended and advanced cascade controllers support a variety of different pumps and Drive configurations. All of these configurations must have at
least one variable speed pump, controlled by a VLT AQUA Drive, with the extended and advanced cascade controller option card installed. They support
1 to 8 additional pumps each connected to either a Danfoss VLT Drive with master/follower or to line power through a contactor or soft starter for a
direct online system.
When setting up the system, it is necessary to create a hardware configuration, which communicates with the master to determine how many pumps
and drives are connected. The necessary hardware is described in the following hardware configuration examples.
The following describes the features and how to use the extended cascade in parameter group 27:
3.1.2 Extension of Basic Cascade
Use of the extended cascade option MCO 101 as an extension of
the basic cascade built into drive 3.1.2
In applications already controlled by the built-in cascade controller in group 25**, the option card can be used to extend the numbers of relays for cascade
control. For instance, if a new pump is added to the system. It can also be used in case it is necessary to alternate the lead pump in systems with more
than 2 drives, which is the limit for the basic cascade without the MCO 101 option installed.
Install the option in slot B, enable the basic cascade in P27-10. Please refer to AQUA Programming guide for parameter group 25 settings.
Example: The electrical wiring diagram for the external equipment needed for systems with an alternating lead pump of four pumps using the basic
cascade and the MCO 101 as a relay extension.
®
MI.38.C2.22 - VLT is a registered Danfoss trademark
3 Supported Configuration
3
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