Configuring The System; Configuring The Extended And Advanced Cascade Controller; Setting-Up The Cascade Parameters; Configuration Of Multiple Frequency Converters - Danfoss VLT AQUA Operating Instructions Manual

Configuring the System

4 Configuring the System
4.1 Configuring the Extended and
Advanced Cascade Controller
The Extended- and Advanced Cascade Controller can be
quickly configured using many of the default parameters.
For more information about application types and on how
4 4
to use advanced features of the Cascade Controller
options, see also 2 Application Types.
NOTICE
To avoid a misconfiguration, check the settings even if
the parameters have their default values.

4.1.1 Setting-up the Cascade Parameters

Configure the Cascade Controller as follows:
1. Select values for the parameters in parameter
group 27-1* Configuration.
Parameter Description
27-10 Cascade Controller can be used to enable or disable
the Extended Cascade Controller. The mixed pump
selection is the general selection for the Cascade
Controller. If using one frequency converter per
pump the master-follower configuration can be
selected reducing the number of parameters needed
to setup the system.
27-11 Set number of frequency converters
27-12 Number of pumps - will default to the number of
frequency converters.
27-14 Pump capacity for each pump (Indexed Parameter) -
If all pumps are the same size the default values
shall be used. To adjust: first choose pump, press
[OK] and adjust the capacity.
27-16 Runtime balancing for each pump (Indexed
Parameter) - If the system should equally balance
the running hours between the pumps then use the
default values.
27-17 Motor Starters - All fixed speed pumps must be the
same.
27-18 Spin time for unused pumps - Depends on the size
of the pumps.
Table 4.1
2. Define relays in parameter group 27-7*
Connections
16
®
VLT AQUA Drive MCO 101/MCO 102
•
•
•
NOTICE
Any unused relays will be available for other functions
through the parameter group 5-4* Relays.
4.1.2 Configuration of Multiple Frequency
If more than one frequency converter is used with the
Cascade Controller the master drive sets the frequency for
all frequency converters via a digital signal.
Illustration 4.1 Multiple Frequency Converters
NOTICE
All frequency converters always run at the same speed.
1.
2.
3.
®
MI38C402 - VLT is a registered Danfoss trademark
Assign one relay for each follower drive in the
system
Assign the relays for the fixed speed pumps.
If it is necessary to have a single frequency
converter alternate between two pumps, then
assign additional relays.
Converters
DO DO
Pin 27 Pin 27
Set basic cascade parameters, see 4.1.1 Setting-up
the Cascade Parameters
Set 5-01 Terminal 27 Mode to [1] Output,
5-30 Terminal 27 Digital Output to [55] Pulse
output and 5-60 Terminal 27 Pulse Output Variable
to [116] Cascade ref.
Set each follower drive to open loop, set
1-00 Configuration Mode to [0] Open Loop and
3-15 Reference 1 Source to selection [7] Pulse input
29 and 5-13 Terminal 29 Digital Input to [32] Pulse
input.
DI DI
Pin 29 Pin 29
DI DI
Pin 29 Pin 29