Danfoss VLT AQUA Drive FC 202 Programming Manual page 243

Parameter Description
3.25.6 29-6* Flow Meter
®
VLT AQUA Drive FC 202 can measure the flow in the
system. Irrigation applications is the most common use
case for parameters in this parameter group. The
functionality allows to:
•
Measure the flow in the system.
•
Calculate the water volume pumped for a period
of time.
•
React on flow conditions (for example, low flow
rate).
•
Control the system using the pumped water
volume calculated by the frequency converter (for
example, stop pumping when a certain amount
of water is pumped, cyclic pumping of water
volumes).
•
Utilize the output signal of an external flow meter
that is connected to an input of the frequency
converter.
Inputs and supported signal types
The flow meter feature can use and scale the output
signals of commonly used flow meters. The feature
supports the following signal types:
•
Current: 0/4–20 mA.
•
Voltage: 0–10 V.
•
Pulse signal (for example: paddle wheel flow
meters).
Configure the scaling of the flow meter signal received as
input via the available parameters for the input configu-
ration (parameters in parameter group 6-** Analog In/Out,
or 5-5* Pulse Input). The flow meter feature also supports
inputs of hardware options.
Volume counters
The flow meter feature uses 2 different counters for storing
the calculated volume of pumped water:
•
Parameter 29-66 Actual Volume: See the volume of
water pumped since the last counter reset.
•
Parameter 29-65 Totalized Volume: See the volume
of water pumped since the last counter reset. Use
this parameter for the total volume of water
pumped.
The 2 counters can have different units. Use
parameter 29-66 Actual Volume for shorter periods of time.
Each parameter can be reset individually in 1 of the
following ways:
•
Using parameter 29-67 Reset Totalized Volume or
parameter 29-68 Reset Actual Volume.
•
Using a digital input.
•
Using an action of the smart logic controller.
MG20OB02
Programming Guide
Reading the data
The measured data is available via readout parameters:
•
•
•
To show the readout parameters on the LCP, configure the
display lines. Comparator operands can use the data from
readout parameters as conditions for SLC, and as triggers
for actions. The measured flow can also be used as input
for the feedback.
NOTICE
This software feature has not been designed as being
part of a calibrated measurement system. The overall
accuracy also depends on external factors such as flow
conditions and used flow meter. See the design guide for
details about analog and digital inputs of the frequency
converter.
Examples
•
•
•
29-60 Flow Meter Monitor
Enable the flow meter monitor.
Option:
[0] Disabled
*
[1] Enabled
[2] Enabled While Running Enable the monitor only when the
29-61 Flow Meter Source
Select the source for the flow meter signal. Available options
depend on the hardware configuration.
Option:
[0]
*
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
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Parameter 29-65 Totalized Volume.
Parameter 29-66 Actual Volume.
Parameter 29-69 Flow.
A sequence of SLC is triggered (or stopped) after
a specific amount of water is pumped.
The frequency converter performs 1 or more
actions and resets the volume counters within a
sequence of SLC.
An alert shows up after a specific amount of
water is pumped.
Function:
connected pump is running.
Analog Input 53
Analog Input 54
Analog Input X30/11
Analog Input X30/12
Analog Input X42/1
Analog Input X42/3
Analog Input X42/5
Analog Input X48/2
Pulse Input 29
Pulse Input 33
Bus Feedback 1
Bus Feedback 2
Bus Feedback 3
3 3
Function:
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