Danfoss VLT AQUA Drive FC 202 Design Manual page 23

Product Features
When using cascade controllers, the individual pumps are
turned on (staged) automatically and turned off (destaged)
as needed to satisfy the required system output for flow or
pressure. The speed of pumps connected to the VLT
AQUA Drive is also controlled to provide a continuous
range of system output.
Designated use
The cascade controller options are designed for pump
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 drive
with the cascade controller option. It controls a set of
pumps, each controlled by a drive or connected to a
contactor or a soft starter.
Extra drives in the system (slave 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 slave drives are referred
to as variable speed pumps.
Pumps connected to mains through a contactor or 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.
100% 100%
1 VSP + 2 FSP
Built-in
parameter group 25-** Cascade Controller
® 1 VSP + 5 FSP
VLT Extended Cascade
parameter group 25-** Cascade Controller
Controller MCO 101
® 1 VSP + 8 FSP
VLT Advanced
parameter group 25-** Cascade Controller
Cascade Controller
MCO 102
Illustration 5.7 Application Overview
MG22B102
Design Guide
®
Built-in
VLT
Cascade Controller
MCO 101
VLT
Cascade Controller
MCO 102
Built-in
VLT
200% 200%
Controller MCO 101
VLT
Controller MCO 102
VSP = Variable-speed pump (directly connected to the drive).
FSP = Fixed-speed pump (the motor could be connected via
contactor, soft starter, or star/delta starter).
Danfoss A/S © 05/2017 All rights reserved.
1–6 VSP + 1–5 FSP
®
Extended
(maximum 6 pumps)
parameter group 27-** Cascade CTL
Option
1–8 VSP + 1–7 FSP
®
Advanced
(maximum 8 pumps)
parameter group 27-** Cascade CTL
Option
Illustration 5.8 Application Overview
6 VSP
®
Extended Cascade
parameter group 27-** Cascade CTL
Option
8 VSP
®
Advanced Cascade
parameter group 27-** Cascade CTL
Option
Illustration 5.9 Application Overview
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