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
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
•
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.
NOTICE
Any unused relays will be available for other functions
through the parameter group
5-4* Relays
.
4.1.2 Configuration of Multiple Frequency
Converters
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.
DO
Pin 27
DI
DI
Pin 29
Pin 29
DO
Pin 27
DI
DI
Pin 29
Pin 29
Illustration 4.1 Multiple Frequency Converters
NOTICE
All frequency converters always run at the same speed.
1.
Set basic cascade parameters, see
4.1.1 Setting-up
the Cascade Parameters
2.
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.
3.
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
.
Configuring the System
VLT
®
AQUA Drive MCO 101/MCO 102
16
MI38C402 - VLT
®
is a registered Danfoss trademark
4
4
