8 Commissioning/Shutdown
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PumpDrive 2
NOTE
Carry out AMA only when the motor is cold to adapt the frequency inverter.
If standard AMA and extended AMA are used in conjunction with long motor
connection cables, measurement errors can occur when identifying the extended
motor data. This, in turn, can prevent the motor from being operated in an optimal
fashion or prevent it from being operated at all. In such scenarios, it is
recommended that you use offline AMA.
8.5.1 Automatic motor adaptation (AMA) of frequency inverter for asynchronous
motors
Three (3) types of AMA are available to carry out automatic motor adaptation for
asynchronous motors:
▪ Offline calculation:
Using the nominal data of the motor as a basis, the extended motor data
required for vector control is calculated.
▪ Standard AMA:
The extended motor data is determined by taking a measurement with the
motor being at a standstill.
▪ Extended AMA:
The extended motor data is determined by taking a measurement with the
motor running at approximately 10percent of its nominal speed.
The extended AMA option is the most accurate method for determining the
extended motor data and ensures very good control of the motor. Offline calculation
is the simplest method available and is sufficient for basic applications.
After starting AMA using the Start Automatic Motor Adaptation parameter (3-3-3-1),
you can select one of the above-mentioned types for automatic motor adaptation.
The motor is disabled while AMA is being carried out.
NOTE
Carrying out standard AMA and extended AMA in particular can take several
minutes, depending on the size of the motor.
NOTE
If the extended motor data cannot be determined using the AMA option, an AMA
Fault alert is output. In this scenario, the extended motor data is not saved and
AMA must be restarted.
NOTE
If a different alert is output while AMA is being carried out, the AMA process is
interrupted and the AMA Fault alert is output. In this scenario, the extended motor
data is not saved and AMA must be restarted.
The following extended motor data (3-3-3-2 to 3-3-3-5) is calculated or measured
depending on the AMA type selected under Start Automatic Motor Adaptation
(3-3-3-1):
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