4.15 Main Menu - FC Closed Loop - Group
20
This parameter group is used for configuring the closed-
loop PI controller, that controls the output frequency of
the frequency converter.
4.15.1 20-0* Feedback
This parameter group is used to configure the feedback
signal for the closed-loop PI control of the frequency
converter.
20-00 Feedback 1 Source
Option:
Function:
This parameter defines the inputs
used as the source of the feedback
signal.
[0]
*
No function
[1]
Analog Input 53
[2]
Analog Input 54
[3]
Pulse input 29
[100] Bus Feedback 1
[104] Sensorless Flow
[105] Sensorless Pressure
20-01 Feedback 1 Conversion
Option:
Function:
This parameter allows a conversion function to
be applied to feedback 1.
[0]
*
Linear
[0] Linear
has no effect on the feedback.
[1]
Square
root
[1] Square root
is commonly used when a
pressure sensor is used to provide flow
feedback
(
( flow ∝ pressure)
).
20-12 Reference/Feedback Unit
Option: Function:
[0] None See
parameter 20-02 Feedback 1 Source Unit
for details.
4.15.2 20-2* Feedback/Setpoint
This parameter group is used to determine how the PID
controller uses the 3 possible feedback signals to control
the output frequency of the frequency converter. This
group is also used to store the 3 internal setpoint
references.
20-21 Setpoint 1
Range:
Function:
0
ProcessCtrlUnit
*
[-999999.999 -
999999.999
ProcessCtrlUnit]
Setpoint 1 is used in closed-
loop mode to enter a setpoint
reference that is used by the
frequency converter’s PID
controller. See the description
20-21 Setpoint 1
Range:
Function:
of
parameter 20-20 Feedback
Function
.
NOTICE
The setpoint reference
entered here is added to
any other references that
are enabled (see
parameter group
3-1*
References
).
4.15.3 20-6* Sensorless
20-60 Sensorless Unit
Select the unit to be used with
Option:
Function:
[0]
None
[20]
l/s
20-69 Sensorless Information
Range:
Function:
0
*
[0 - 25 ]
View information about the sensorless data.
4.15.4 20-8* PI Basic Settings
Parameters for configuring the process PI control.
20-81 PI Normal/ Inverse Control
Option:
Function:
[0]
*
Normal Causes the frequency converter output frequency
to decrease when the feedback is greater than the
setpoint reference. This behavior is common for
pressure-controlled supply fan and pump
applications.
[1]
Inverse Causes the frequency converter output frequency
to increase when the feedback is greater than the
setpoint reference. This behavior is common for
temperature-controlled cooling applications, such
as cooling towers.
20-83 PI Start Speed [Hz]
Range:
Function:
0 Hz
*
[ 0 -
200.0 Hz]
Enter the motor speed to be attained as a
start signal for commencement of PI control.
After power-up, the frequency converter
operates using speed open-loop control.
When the process PI start speed is reached,
the frequency converter changes to PI control.
Parameters
VLT
®
DriveMotor FCP 106/FCM 106
102
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MG03N202
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