Communication Options; Input/Output, Feedback And Safety Options; Cascade Control Options - Danfoss VLT AQUA Drive FC 202 Design Manual

System Integration
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Input capitance load: <10 uF.
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Power-up delay: <0.6 s.
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Easy to install in frequency converters in existing
machines.
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Keeps the control board and options active
during power cuts.
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Keeps fieldbuses active during power cuts
Ordering number 130B1108 uncoated – 130B1208
coated (Class G3/ISA S71.04-1985).

3.7.1 Communication Options

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VLT PROFIBUS DP V1 MCA 101
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VLT DeviceNet MCA 104
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VLT PROFINET MCA 120
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VLT EtherNet/IP MCA 121
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VLT Modbus TCP MCA 122
For further information, refer to chapter 7 Specifications.
3.7.2 Input/Output, Feedback and Safety
Options
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VLT General Purpose I/O Module MCB 101
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VLT Relay Card MCB 105
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VLT PTC Thermistor Card MCB 112
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VLT Extended Relay Card MCB 113
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VLT Sensor Input Option MCB 114
For further information, refer to chapter 7 Specifications.

3.7.3 Cascade Control Options

The cascade controller options extend the number of
available relays. Once one of the options is installed, the
parameters needed to support the cascade controller
functions will be available through the control panel.
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:
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Built-in basic cascade controller (standard cascade
controller)
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MCO 101 (extended cascade controller)
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MCO 102 (advanced cascade controller)
For further information, see chapter 7 Specifications.
MG20N602
Design Guide
The extended cascade controller can be used in 2 different
modes:
MCO 101 allows using a total of 5 relays for cascade
control. MCO 102 allows controlling a total of 8 pumps.
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
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 the cascade controller option. It
controls a set of pumps, each controlled by a frequency
converter or connected to a contactor or a soft starter.
Additional frequency converters in the system (slave
®
AQUA Drive.
frequency converters) do not need any cascade controller
option card. They are operated in open-loop mode and
receive their speed reference from the master frequency
converter. Pumps connected to slave frequency converters
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 frequency converter.
Danfoss A/S © 09/2014 All rights reserved.
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With the extended features controlled by
parameter group 27-** Cascade CTL Option.
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To extend the number of available relays for the
basic cascade controlled by parameter
group 25-**. Cascade Controller.
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Automatically turning individual pumps on/off.
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Controlling the speed of the pumps.
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AQUA Drive is also controlled to
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