Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 35)

Rockwell Automation Publication 750-RM002B-EN-P - September 2013 35
Drive Configuration Chapter 1
Autotune The Autotune feature is used to measure motor characteristics. The Autotune
feature is made up of several individual tests, each of which is intended to identify
one or more motor parameters. These tests require motor nameplate information
to be entered into the drive parameters. Although some of the parameter values
can be changed manually, measured values of the motor parameters provide the
best performance. Each motor control mode requires its own set of tests to be
performed. The information obtained from these measurements is stored in the
drives non volatile memory for use during operation of the drive. The feature lets
these tests to be separated into tests that don’t require motor rotation (Static
Tune), all tests within the selected control mode (Rotate Tune), or if the control
mode requires the Inertia (Inertia Tune).
The Autotune tests are selected through the P70 [Autotune]. The feature
provides a manual or automatic method for setting P73 [IR Voltage Drop], P74
[Ixo Voltage Drop] and P75 [Flux Current Ref ]. Valid only when P35 [Motor
Ctrl Mode] is set to 1 “Induction SV,” 2 “Induct Econ,” or 3 “Induction FV.”
Other motor control modes such as Permanent Magnet and Interior Permanent
magnet, populate other parameters associated with those control modes. See the
autotune parameter set below.
Tests
Four Autotune selections are available in the PowerFlex 755 drive control. All
four selections are selected from the Autotune parameter.
P70 [Autotune]
• 0 = Ready
• 1 = Calculate
• 2 = Static Tune
• 3 = Rotate Tune
• 4 = Inertia Tune
Ready
Parameter returns to this setting following a Static Tune or Rotate Tune, at which
time another start transition is required to operate the drive in Normal mode. It
also permits manually setting P73 [IR Voltage Drop], P74 [Ixo Voltage Drop],
and P75 [Flux Current Ref ].