Smart Logic Control Programming - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
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 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 con-
nected motor.
Par. 1-29 allows a choice of complete AMA with determination of all electrical motor parameters or re-
duced 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 to 1-26.
• 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 synchronous motors. If synchronous motors are ap-
plied, 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
imperative 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.

Smart Logic Control Programming

A new useful facility in FC 302 is the Smart Logic Control (SLC).
In applications where a PLC is generating a simple sequence the SLC may take over elementary tasks
from the main control.
SLC is designed to act from event sent to or generated in the FC 302. The frequency converter will then
perform the pre-programmed action.
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Application Examples
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