3.3 Parameters 1-** Load and Motor
3.3.1 1-0* General Settings
Define whether the frequency converter operates in open
loop or closed loop.
1-00 Configuration Mode
Option:
Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
NOTICE
When set to
[3] Closed Loop
, the commands
reversing and start reversing do not reverse
the motor direction.
[0] Open
Loop
Motor speed is determined by applying a speed
reference or by setting the speed when in hand-on
mode.
Open loop is also used if the frequency converter
is part of a closed-loop control system based on an
external PID controller providing a speed reference
signal as output.
[3] Closed
Loop
Motor speed is determined by a reference from the
built-in PID controller varying the motor speed as
in a closed-loop control process (for example
constant pressure or flow). Configure the PID
controller in
parameter group 20-** Feedback
or via
the
Function Set-ups
accessed by pressing [Quick
Menu].
1-01 Motor Control Principle
Option:
Function:
NOTICE
This parameter cannot be adjusted
while the motor is running.
Select which motor control principle to
employ.
[0]
*
U/f
Special motor mode for parallel connected
motors in special motor applications. When
U/f is selected, edit the characteristic of the
control principle in
and
.
[1]
VVC+
Voltage vector control principle suitable for
most applications. The main benefit of VVC
+
operation is that it uses a robust motor
model.
[2]
Flux
sensorless
Flux vector control without encoder
feedback, for simple installation and
robustness against sudden load changes.
1-01 Motor Control Principle
Option:
Function:
[3]
Flux w/
motor feedb
High accuracy speed and torque control,
suitable for the most demanding
applications.
1-03 Torque Characteristics
Option:
Function:
[0] Constant
torque
For speed control of constant torque applications
such as:
•
Axial pumps.
•
Positive displacement pumps.
•
Blowers.
Provides a voltage, which is optimized for a
constant torque load characteristic of the motor
in the entire speed range.
[1] Variable
torque
For speed control of centrifugal pumps and fans.
Also to be used when controlling more than 1
motor from the same frequency converter (for
example, multiple condenser fans or cooling
tower fans). Provides a voltage, which is
optimized for a squared torque load charac-
teristic of the motor.
[2] Auto
Energy
Optim. CT
For optimum energy-efficient speed control of
screw and scroll compressors. Provides a voltage,
which is optimized for a constant torque load
characteristic of the motor in the entire range
down to 15 Hz. Furthermore, the AEO feature
adapts the voltage exactly to the current load
situation, reducing energy consumption and
audible noise from the motor. To obtain optimal
performance, set the motor power factor cos phi
correctly. This value is set in
parameter 14-43 Motor Cosphi
. The parameter has
a default value that is automatically adjusted
when the motor data is programmed. These
settings typically ensure optimum motor voltage,
but if the motor power factor cos phi requires
tuning, an AMA function can be carried out
using
parameter 1-29 Automatic Motor Adaptation
.
[3]
*
Auto
Energy
Optim. VT
For optimum energy-efficient speed control of
centrifugal pumps and fans. Provides a voltage,
which is optimized for a squared torque load
characteristic of the motor. Furthermore, the AEO
feature adapts the voltage exactly to the current
load situation, reducing energy consumption and
audible noise from the motor. To obtain optimal
performance, set the motor power factor
correctly. This value is set in
parameter 14-43 Motor Cosphi
. The parameter has
a default value that is automatically adjusted
when the motor data is programmed. These
settings typically ensure optimum motor voltage,
Parameter Description
VLT
®
AQUA Drive FC 202
40
Danfoss A/S © 05/2018 All rights reserved.
MG20OB02
3
3
Summary of Contents for VLT AQUA Drive FC 202
Page 2: ......
