1-29 Automatic Motor Adaptation (AMA)
Option:
Function:
The AMA function optimises dynamic motor performance by automatically optimising the advanced motor pa-
rameters (par. 1-30 to par. 1-35) at motor standstill.
Activate the AMA function by pressing [Hand on] after selecting [1] or [2]. See also the section
Automatic Motor
Adaptation
in the Design Guide. After a normal sequence, the display will read: "Press [OK] to finish AMA". After
pressing the [OK] key the frequency converter is ready for operation.
This parameter cannot be adjusted while the motor is running.
[0]
*
OFF
[1]
Enable complete AMA
Performs AMA of the stator resistance R
S
, the rotor resistance R
r
, the stator leakage reactance X
1
, the rotor
leakage reactance X
2
and the main reactance X
h
. Select this option if an LC filter is used between the frequency
converter and the motor.
FC 301:
The Complete AMA does not include X
h
measurement for FC 301. Instead, the X
h
value is determined
from the motor database. Par. 1-35
Main Reactance (X
h
)
may be adjusted to obtain optimal start performance.
[2]
Enable reduced AMA
Performs a reduced AMA of the stator resistance R
s
in the system only.
Note:
•
For the best adaptation of the frequency converter, run AMA on a cold motor.
•
AMA cannot be performed while the motor is running.
•
AMA cannot be performed on permanent magnet motors.
NB!
It is important to set motor par. 1-2* Motor Data correctly, since these form part of the AMA algorithm. An AMA must be performed
to achieve optimum dynamic motor performance. It may take up to 10 min, depending on the power rating of the motor.
NB!
Avoid generating external torque during AMA.
NB!
If one of the settings in par. 1-2* Motor Data is changed, par. 1-30 to 1-39, the advanced motor parameters, will return to default
setting.
NB!
AMA will work problem-free on 1 motor size down, typically work on 2 motor sizes down, rarely work on 3 sizes down and never work
on 4 sizes down. Please keep in mind that the accuracy of the measured motor data will be poorer when you operate on motors smaller
than nominal VLT size.
2.4.4. 1-3* Adv. Motor Data
Parameters for advanced motor data. The motor data in par. 1-30 - par. 1-39 must match the relevant motor in order to run the motor optimally. The
default settings are figures based on common motor parameter values from standard motors. If the motor parameters are not set correctly, a malfunction
of the frequency converter system may occur. If the motor data is not known, running an AMA (Automatic Motor Adaptation) is recommended. See the
Automatic Motor Adaptation
section in the Design Guide. The AMA sequence will adjust all motor parameters except the moment of inertia of the rotor
and the iron loss resistance (par. 1-36).
Parameters 1-3* and 1-4* cannot be adjusted while the motor is running.
2. How to Programme
FC 300 Programming Guide
42
MG.33.M3.02 - VLT
®
is a registered Danfoss trademark
2