Application Types; Overview; Supported Configurations; Extension Of Basic Cascade - Parameter Group 25** Control Mode - Danfoss VLT AQUA Operating Instructions Manual

Application Types

2 Application Types

2.1 Overview

100% 100% 200%
1 VSP + 2 FSP
Built-
parameter group 25-** Cascade
in
Controller
1 VSP + 5 FSP
MCO parameter group 25-** Cascade
101 Controller
1 VSP + 8 FSP
MCO parameter group 25-** Cascade
102 Controller
Table 2.1 Application Overview
VSP = Variable Speed Pump (directly connected to the frequency
converter)
FSP = Fixed Speed Pump (the motor could be connected via
contactor, soft starter or star/delta starter)

2.2 Supported Configurations

When setting-up the system, create a hardware configu-
ration, which communicates the number of connected
pumps and frequency converters to the master. The
necessary hardware is explained in the following hardware
configuration examples.
2.2.1 Extension of Basic Cascade -
Parameter Group 25** Control Mode
Use of the extended cascade option MCO 101 as an
extension of the built-in basic cascade in the frequency
converter
In applications already controlled by the built-in Cascade
Controller in parameter group 25-**, the option card can
®
VLT AQUA Drive MCO 101/MCO 102
200%
-
1 to 6 VSP + 1 to 5 FSP
(max. 6 pumps)
parameter group 27-** Cascade
CTL Option
1 to 8 VSP + 1 to 7 FSP
(max. 8 pumps)
parameter group 27-** Cascade
CTL Option
®
MI38C402 - VLT is a registered Danfoss trademark
-
6 VSP
parameter group 27-** Cascade
CTL Option
8 VSP
parameter group 27-** Cascade
CTL Option
be used to extend the numbers of relays for cascade
control. For instance if a new pump is added to the
system.
Enable the Basic Cascade Controller in 27-10 Cascade
Controller by selecting [3] Basic Cascade Ctrl. Refer to VLT
AQUA Drive Programming Guide for further programming
with parameter group 25-** settings.
Illustration 2.1 and Illustration 2.2 show the external wiring
needed for systems with alternating lead pump of 4
pumps using basic cascade and MCO 101 as relay
extension.
2 2
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