Introduction; Purpose Of These Operating Instructions; Software Version - Danfoss VLT AQUA Operating Instructions Manual

Introduction

1 Introduction

1.1 Purpose of these Operating Instructions

The purpose of these operating instructions is to describe
the Danfoss Cascade Controller Options MCO 101 and
MCO 102.
The operating instructions contain information about:
•
Application types
•
Installation
•
Configuring the system
•
Parameters
•
Configuration examples
These operating instructions are intended for use by
qualified personnel. Read these operating instructions in
full in order to use the Cascade Controller Options safely
and professionally and pay particular attention to the
safety instructions and general warnings.

1.1.1 Software Version

Extended Cascade Controller Option for
®
VLT AQUA Drive
Software version: 1.9x
Table 1.1 Software Version
NOTICE
MCO 101/102 is software supported from version 1.24
onwards.
1.1.2 Cascade Control
The Cascade Controller consists of an option board
containing 3 relays that is installed in option slot B. Once
options are installed the parameters needed to support the
Cascade Controller functions will be available through the
control panel in parameter group 27-**.
MCO 101 and 102 are add-on options extending the
supported number of pumps and the functionalities of the
built-in Cascade Controller in the VLT
The following options for cascade control are available for
®
the VLT AQUA Drive:
®
VLT AQUA Drive MCO 101/MCO 102
For further information, see 2 Application Types.
The Extended Cascade Controller can be used in two
different modes:
With MCO 101, a total of 5 relays can be used for cascade
control and with MCO 102, a total of 8 pumps can be
controlled. The options are able to alternate the lead
pump with 2 relays per pump.
NOTICE
If MCO 102 is installed, the relay option MCB 105 can
extend the number of relays to 13.
Application
Cascade control is a common control system used to
control parallel pumps or fans in an energy efficient way.
The Cascade Controller option enables control of multiple
pumps configured in parallel by:
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 the VLT
provide a continuous range of system output.
Designated use
The Cascade Controller options are designed for pump
®
AQUA Drive.
applications, however, it is also possible to use Cascade
Controllers in any application requiring multiple motors
configured in parallel.
Operating principle
The Cascade Controller software runs from a single
frequency converter with Cascade Controller option
(master drive). It controls a set of pumps, each controlled
®
MI38C402 - VLT is a registered Danfoss trademark
•
Built-in Basic Cascade Controller (standard
Cascade Controller)
•
MCO 101 (Extended Cascade Controller)
•
MCO 102 (Advanced Cascade Controller)
•
with the extended features controlled by
parameter group 27-**
•
to extend the number of available relays for the
Basic cascade controlled by parameter
group 25-**
•
Automatically turning individual pumps on/off
•
Controlling the speed of the pumps
®
AQUA Drive is also controlled to
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