Danfoss VLT Instruction Manual page 80

6 How to program the adjustable frequency
drive
1-03 Torque Characteristics
Option:
[0] Compressor torque
[1] Variable torque
[2] Auto Energy Optim. CT
6
[3] * Auto Energy Optim. VT
1-29 Automatic Motor Adaptation (AMA)
Option:
[0] * Off
[1] Enable complete AMA
[2] Enable reduced AMA
Activate the AMA function by pressing [Hand on] after selecting [1] or [2]. See also the section
the display will read: "Press [OK] to finish AMA". After pressing the [OK] key, the adjustable frequency drive is ready for operation.
Note:
• For the best adaptation of the adjustable frequency drive, run AMA on a cold motor
• AMA cannot be performed while the motor is running.
6-22
Function:
Compressor [0]: For 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 10 Hz.
Variable Torque
[1]: For speed control of centrifugal pumps and fans. Also to be used when con-
trolling more than one motor from the same adjustable frequency drive (e.g., multiple condenser
fans or cooling tower fans). Provides a voltage which is optimized for a squared torque load char-
acteristic of the motor.
Auto Energy Optimization Compressor
scroll compressors. Provides a voltage which is optimized for a constant 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 obtain optimal performance, the motor power factor cos phi must be set correctly.
Motor Cos-Phi
This value is set in par. 14-43
ically 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 function can be carried
Automatic Motor Adaptation (AMA)
out using par.1-29
power factor parameter manually.
Auto Energy Optimization VT
[3]: 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
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 obtain optimal performance,
the motor power factor cos phi must be set correctly. This value is set in par. 14-43
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 function can be carried out using par.1-29
Adaptation (AMA)
. It is very rarely necessary to adjust the motor power factor parameter manually.
Function:
The AMA function optimizes dynamic motor performance by automatically optimizing the advanced
Stator Resistance (Rs)
motor parameters par. 1-30
motor is stationary.
No function
performs AMA of the stator resistance R
the rotor leakage reactance X and the main reactance X
2
performs a reduced AMA of the stator resistance R
filter is used between the adjustable frequency drive and the motor.
MG.11.A9.22 - VLT ® is a registered Danfoss trademark
VLT ® HVAC Drive Instruction Manual
[2]: For optimum energy efficient speed control of screw and
. The parameter has a default value which is automat-
. It is very rarely necessary to adjust the motor
Main Reactance (Xh)
to par. 1-35
, the rotor resistance R , the stator leakage reactance X
S r
.
h
in the system only. Select this option if an LC
s
Automatic Motor Adaptation . After a normal sequence,
Motor Cos-
Automatic Motor
) while the
,
1