Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 19)

Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013 19
Detail Drive Configuration and Operation Chapter 1
Direction Test
The direction test checks the actual direction relative to the commanded
direction, and checks for proper encoder feedback. The test prompts you to
answer if the motor direction is correct. When it is not, you can either power
down and swap two of the motor leads, or change the drive’s logic to change the
motor direction. Then the test is performed again. The test then checks if the
feedback is positive. When it is not, you can either power down and swap two of
the encoder signals, or you can change the drive’s logic to change the sign of the
feedback. Then the test is performed again.
Motor Tests
This submenu performs the tests to measure the motor characteristics. These
tests can be performed with the motor coupled or uncoupled to the load, but be
aware that the motor will rotate during some of the tests.
For Field Oriented Control the following motor tests are performed:
For Permanent Magnet Control the following motor tests are performed:
Stator Resistance Test
This test identifies the motor stator resistance and stores the value into parameter
491 [StatorResistance]. The motor should not rotate during this test.
Stator Inductance Test
This test identifies the motor stator inductance and stores the value into parameter
490 [StatorInductance]. The motor should not rotate during this test.
Leakage Inductance Test
This test measures the inductance characteristics of the motor. A measurement of the motor inductance is required to
determine references for the regulators that control torque. The motor should not rotate during this test. The test
runs for approximately 1 minute and then stores the calculated value into parameter 492 [LeakInductance]. A typical
value is between 15 and 25%.
Flux Current Test
This test is used to identify the value of motor flux current required to produce rated motor torque at rated current.
When the flux test is performed, the motor will rotate. The drive accelerates the motor to the speed set in parameter
19 [Atune Spd Ref] (default is 85% of base speed) and then coasts for several seconds. This cycle may repeat several
times, then decelerate to a low speed and shut off. This test stores the value for flux current in parameter 488 [Flux
Current].
Stator Resistance Test
This test identifies the motor stator resistance and stores the value into parameter 522 [PM Stator Resist]. The motor
should not rotate during this test.
Stator Inductance Test
This test identifies the motor stator inductance and stores the value into parameter 520 [PM Q Inductance] and 521
[PM D Inductance]. The motor should not rotate during this test.
Encoder Offset
The absolute position sensor counter offset from the rotor flux center position for a Permanent Magnet (PM) motor.
This value is determined by an automated measurement procedure, which uses parameter 505 [PM TestWait Time],
506 [PM Test Idc Ramp], 507 [PM Test FreqRamp], 508 [PM Test Freq Ref] and 509 [PM Test I Ref]. First, the Flux
Producing (d-axis) current is applied to the stator, starting with 0A and with 0 Hz. Current increases with the ramp
rate defined by parameter 506 [PM Test Idc Ramp] to the peak current value defined by parameter 509 [PM Test I
Ref]. The current is continuously applied at this level for the time interval defined by parameter 505 [PM TestWait
Time]. Then, the DC excitation position will be changed by 90 electrical degrees with the frequency defined by
parameter 508 [PM Test Freq Ref] and the rate change of the frequency defined by parameter 507 [PM Test
FreqRamp]. The 90 degree phase shifted d-axis current with the current value defined by parameter 509 [PM Test I
Ref] is continuously applied for the time interval defined by parameter 505 [PM TestWait Time] The value of
parameter 504 [PM AbsEnc Offst] is determined by value in the absolute position sensor counter.
Back EMF
Measures the permanent magnet motor CEMF (motor voltage feedback) coefficient and stores the value in
parameter 523 [PM Mtr CEMF Coef].