Rockwell-automation 7000 PowerFlex Medium Voltage (B Frame) Commission Manual de usuario descargar pdf (Pagina 105)

Rockwell Automation Publication 7000-IN006B-EN-P - May 2013 101

Commissioning the Drive Chapter 5

• Regulator Limit - indicates that the torque command was greater than Trq

Limit Motoring or Trq Limit Braking. The measured inertia value is

invalid. Set the Autotune Trq Stp or Autotune Spd Cmd parameter to a

lower value and repeat the test.

• Tuning abort - indicates that the deviation in motor speed was greater than

10 Hz. The measured inertia value is invalid. Set Autotune Trq Stp to a

lower value and repeat the test.

• Inertia high - indicates that the measured total inertia is greater than 20

seconds. This warning indicates an unusually high inertia value. For a very

high inertia load such as a large fan, this may be a valid result; set Total

Inertia manually to equal Autotune Inertia. However, a high inertia

measurement might also indicates that the Autotune Trq Stp value is too

low.

Flux Regulator Manual Tuning (Induction Motor)

1. Adjust the reference command to a value between 20 and 30 Hz.

2. Start the drive and wait for it to accelerate to the commanded speed.

3. Record the value of parameter Lm Measured (134) in Motor Model.

4. Stop the drive.

5. Set parameter Lm Rated in Motor Model to the recorded value of Lm

Measured.

6. Calculate an approximate value of the rotor time constant using the

following formula:

Where:

Set the parameter T Rotor in Motor Model to the calculated value.

Speed Regulator Manual Tuning (Induction Motor)

If it is not possible to tune the speed regulator using the auto-tune function, then

tune the speed regulator’s step response manually using the following procedure.

To obtain accurate results, the load torque must be steady.

SlipRated

LmRated

rotor

RPMSync

RPMRatedRPMSync

FreqmotorSlipRated

) (

)2(

−

×=

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Rockwell-automation 7000 PowerFlex Medium Voltage (B Frame) Commission Manual de usuario Pagina 105