Danfoss VLT AQUA Programming Manual page 45

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VLT AQUA Drive Programming Guide
1-03 Torque Characteristics
Option:
[0]
[1]
[2]
*
[3]
2.3.2. 1-2* Motor Data
Parameter group 1-2* comprises input data from the nameplate on the connected motor.
Parameters in parameter group 1-2* cannot be adjusted while the motor is running.
NB!
When set for Closed Loop, the commands Reversing and Start Reversing will not
reverse the direction of the motor.
Function:
Constant Torque For speed control of screw and scroll compressors. Provides a
voltage which is optimized for a constant torque load charac-
teristic of the motor in the entire range down to 15 Hz.
Variable torque For speed control of centrifugal pumps and fans. Also to be used
when controlling more than one motor from the same frequency
converter (e.g. multiple condenser fans or cooling tower
fans).Provides a voltage which is optimized for a squared torque
load characteristic of the motor.
Auto energy optim. For optimum energy efficient speed control of screw and scroll
CT compressors. Provides a voltage which is optimized for a con-
stant torque load characteristic of the motor in the entire range
down to 15Hz but in addition the AEO feature will adapt the
voltage exactly to the current load situation, thereby reducing
energy consumption and audible noise from the motor. To ob-
tain optimal performance, the motor power factor cos phi must
be set correctly. This value is set in par. 14-43, Motor cos phi.
The parameter has a default value which is automatically ad-
justed when the motor data is programmed. These settings will
typically ensure optimum motor voltage but if the motor power
factor cos phi requires tuning, an AMA function can be carried
out using par. 1-29, Automatic Motor Adaptation (AMA). It is
very rarely necessary to adjust the motor power factor param-
eter manually.
Auto energy optim. For optimum energy efficient speed control of centrifugal pumps
VT and fans. Provides a voltage which is optimized for a squared
torque load characteristic of the motor but in addition the AEO
feature will adapt the voltage exactly to the current load situa-
tion, thereby reducing energy consumption and audible noise
from the motor. To obtain optimal performance, the motor pow-
er factor cos phi must be set correctly. This value is set in par.
14-43, Motor cos phi. The parameter has a default value and is
automatically adjusted when the motor data is programmed.
These settings will typically ensure optimum motor voltage but
if the motor power factor cos phi requires tuning, an AMA func-
tion can be carried out using par. 1-29, Automatic Motor Adap-
tation (AMA). It is very rarely necessary to adjust the motor
power factor parameter manually.
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MG.20.O2.02 - VLT is a registered Danfoss trademark
2. Parameter Description
45
2