Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 20)

16 Autotune
Aborting an Auto-Reset/Run Cycle
During an auto reset/run cycle the following actions/conditions will abort the reset/
run attempt process.
•
Issuing a stop command from any source. (Note: Removal of a 2-wire run-fwd
or run-rev command is considered a stop assertion).
•
Issuing a fault reset command from any source.
•
Removal of the enable input signal.
•
Setting [Auto Rstrt Tries] to zero.
•
A fault which is not auto resettable.
•
Removing power from the drive.
•
Exhausting an Auto Reset/Run Cycle
After all [Auto Rstrt Tries] have been made and the drive has not successfully
restarted and remained running for five minutes or more, the auto reset/run cycle
will be considered exhausted and therefore unsuccessful. In this case the auto reset/
run cycle will terminate and an additional fault, “Auto Rstrt Tries” (Auto Restart
Tries) will be issued if bit 5 of [Fault Config 1] = “1.”
Autotune Description of parameters determined by the autotune tests.
Flux Current Test
[Flux Current Ref] is set by the flux current test, and is the reactive portion of the
motor current (portion of the current that is out of phase with the motor voltage)
and is used to magnetize the motor. The flux current 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 approximately two-thirds of base speed and then coasts for several
seconds.
IR Voltage Drop Test
[IR Voltage Drop] is set by the IR voltage drop test, and is used to provide
additional voltage to offset the voltage drop developed across the stator resistance.
An accurate calculation of the [IR Voltage Drop] will ensure higher starting torque
and better performance at low speed operation. The motor does not rotate during
this test.
Leakage Inductance Test
[Ixo Voltage Drop] is set by the leakage inductance test and measures the
inductance characteristics of the motor. A measurement is required to determine
references for the regulators that control torque. The motor does not rotate during
this test.
Inertia Test
[Total Inertia] is set by the inertia test and represents the time in seconds, for the
motor coupled to a load to accelerate from zero to base speed at rated motor torque.
During this test, the motor is accelerated to approximately 2/3 of base motor speed.
This test is performed during the Start-up mode, but can be manually performed by
setting [Inertia Autotune] to “Inertia Tune”. The [Total Inertia] and [Speed Desired
BW] automatically determine the [Ki Speed Loop] and [Kp Speed Loop] gains for
the speed regulator.
70EC 700VC 700H
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