FC 300 Design Guide
Application Examples
" Automatic Motor Adaptation (AMA)
AMA is an algorithm to measure the electrical motor parameters on a motor at standstill.
This means that AMA itself does not supply any torque.
AMA is useful when commissioning systems and optimizing the adjustment of the adjustable
frequency drive to the applied motor. This feature is particularly used where the default
setting does not apply to the connected motor.
Par. 1-29 allows a choice of complete AMA with determination of all electrical mo tor parameters
or reduced AMA with determination of the stator resistance Rs only.
The duration of a total AMA varies from a few minutes on small motors to more than 15 minutes on large motors.
Limitations and preconditions:
• For the AMA to determine the motor parameters optimally, enter the correct motor
nameplate d ata in par. 1-20 to 1-26.
• For the best adjustment of the adjustable frequency drive, carry out an AMA on a cold
motor. Repeated AMA runs may lead to a heating of the motor, which results in an increase
of the stator resistance, Rs. N orm ally, this is not c ritical.
• An AMA can only be carried out if the rated m otor current is minimum 35% of the rated output current of
the adjustable fre quency drive. An AMA can be carried out on up to one oversize motor.
• It is possible to carry out a reduced AMA test with an LC filter installed. Avoid ca
rrying out
a comp lete AMA with an LC filter. If an overall setting is re quired, remove the LC filter while
running a total AMA. After completion of the AMA, reinsert the LC filter.
• If motors are coupled in parallel, use only a reduced AMA if any.
• Avoid running a complete AMA when using synchronous motors. If synchronous motors
are applied, run a reduced AMA a nd manually set the extended motor data. The AMA
function does not apply to permanent magnet motors.
• The adjustable frequency drive does not produce motor torque during an AMA. During an AMA, it is
imperative that the application does not force the motor shaft to run, which is known to happen,
e.g., with w ind mi lling in ventilation systems. This disturbs the
AMA function.
132
MG.33.B6.22 - VLT is a registered Danfoss trademark
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