Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control - Manual (Page 103)

Rockwell Automation Publication 7000-IN012B-EN-P - June 2014 103
Commissioning the Drive Chapter 4
Flux Regulator Manual Tuning (Induction Motor)
1. Adjust the reference command to a value between 25...40 Hz.
2. If possible, run the motor loaded (not uncoupled).
3. Start the drive and wait for it to accelerate to the commanded speed.
4. Record the value of parameter Lm Measured (P#134) in Motor Model.
5. Stop the drive.
6. Set parameter Lm Rated in Motor Model to the recorded value of Lm
Measured.
7. Verify that the measured value is:
, where
FLA: Motor Full Load Amps; and,
NLA: Motor No Load Amps.
8. 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, tune
the speed regulator's step response manually using the following procedure.To
obtain accurate results, the load torque must be steady.
1. Click the Display tab, and click Speed Control from the Group Name
column.
The Speed Control parameters will appear in the right window.
2. Click SpdReg Bandwidth and click Value. Type 1.0 in the New Value Field,
and click OK.
L
Mag
FLA
NLA
----------- 
T
rotor
LmRated
RatedSlip
-------------------------- =
RatedSlip 2
Freqmotor   SyncRPM RatedRPM –
 
SyncRPM
-----------------------------------------------------------------

=