Danfoss VLT HVACDrive Instruction Manual

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Contents

Danfoss VLT HVACDrive Instruction Manual Manual pdf 67 page image

5.2.3 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 par-ticularly used where the default setting does not apply to the connected motor.Par. 1-29Automatic Motor Adaptation (AMA) allows a choice of complete AMA with determination of all electrical motor parameters or reduced AMA withdetermination 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. 1-20Motor Power [kW] topar. 1-28Motor Rotation Check.• For the best adjustment of the adjustable frequency drive, carry out AMA on a cold motor. Repeated AMA runs may lead to a heating of themotor, 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 adjustable frequency drive. AMA canbe 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 anoverall 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 applied, run a reduced AMA and manually set theextended 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 notforce the motor shaft to run, which is known to happen with, e.g., wind milling in ventilation systems. This disturbs the AMA function.VLT® HVAC Drive Instruction Manual 5 Commissioning and Application ExamplesMG.11.AB.22 - VLT® is a registered Danfoss trademark 5-95