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 xed-speed pumps. Each pump -
variable speed or xed speed - is controlled by a relay in
the master drive. The cascade controller options can
control a mix of variable speed and xed-speed pumps.
Built-in 1 VSP + 2 FSP
parameter group 25-** Cascade Controller
VLT
®
Extended Cascade
Controller MCO 101
1 VSP + 5 FSP
parameter group 25-** Cascade Controller
VLT
®
Advanced
Cascade Controller
MCO 102
1 VSP + 8 FSP
parameter group 25-** Cascade Controller
Figure 5.7 Application Overview
Built-in –
VLT
®
Extended
Cascade Controller
MCO 101
1–6 VSP + 1–5 FSP (maximum 6 pumps)
parameter group 27-** Cascade CTL
Option
VLT
®
Advanced
Cascade Controller
MCO 102
1–8 VSP + 1–7 FSP (maximum 8 pumps)
parameter group 27-** Cascade CTL
Option
Figure 5.8 Application Overview
Built-in –
VLT
®
Extended Cascade
Controller MCO 101
6 VSP
parameter group 27-** Cascade CTL
Option
VLT
®
Advanced Cascade
Controller MCO 102
8 VSP
parameter group 27-** Cascade CTL
Option
Figure 5.9 Application Overview
Product Features Design Guide
MG22B222 Danfoss A/S © 01/2018 All rights reserved. 27
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