Autotune - Allen-Bradley PowerFlex 70 Reference Manual

Autotune

Autotune
40
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.
• The occurrence of 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."
Description of parameters determined by the autotune tests.
Flux Current Test
[Flux Current Ref ] is set by the flux current test. Flux current 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. [IR Voltage Drop] is used by
the IR Compensation procedure to provide additional voltage at all frequencies
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 should not rotate during this
test.
Leakage Inductance Test
FV
Vector
[Ixo Voltage Drop] is set by the 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.
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013