Automatic Motor Adaptation (Ama) - Danfoss FC 100 Series Operating Instructions Manual

Commissioning and Applicati...

5.2.3 Automatic Motor Adaptation (AMA)

AMA is an algorithm to measure the electrical motor parame-
ters on a motor at standstill. This means that AMA itself does
not supply any torque.
AMA is useful when commissioning systems and optimising
the adjustment of the frequency converter to the applied
motor. This feature is particularly used where the default
setting does not apply to the connected motor.
Par. 1-29 Automatic Motor Adaptation (AMA) allows a choice of
complete AMA with determination of all electrical motor
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 data in
par. 1-20 Motor Power [kW] to par. 1-28 Motor
Rotation Check.
•
For the best adjustment of the frequency converter,
carry out 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. Normally, this
is not critical.
•
AMA can only be carried out if the rated motor
current is minimum 35% of the rated output current
of the frequency converter. AMA can be carried out
on up to one oversize motor.
•
It is possible to carry out a reduced AMA test with a
Sine-wave filter installed. Avoid carrying out a
complete AMA with a Sine-wave filter. If an overall
setting is required, remove the Sine-wave filter while
running a total AMA. After completion of the AMA,
reinsert the Sine-wave filter.
•
If motors are coupled in parallel, use only reduced
AMA if any.
•
Avoid running a complete AMA when using synchro-
nous motors. If synchronous motors are applied, run
a reduced AMA and manually set the extended
motor data. The AMA function does not apply to
permanent magnet motors.
•
The frequency converter does not produce motor
torque during an AMA. During an AMA, it is impera-
tive that the application does not force the motor
shaft to run, which is known to happen with e.g.
wind milling in ventilation systems. This disturbs the
AMA function.
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VLT HVAC Drive Operating Instructions
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MG.11.AD.02 - VLT is a registered Danfoss trademark
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