Torque Performance Modes 2-165
after a value is entered (1 for static or 2 for dynamic) into this parameter and
the start button is pressed. When the tests are finished, the [Autotune]
parameter is set to 0 (ready), the drive is stopped, and the Autotune
procedure is complete.
If any errors are encountered during the Autotune process drive parameters
are not changed, the appropriate fault code will be displayed in the fault
queue, and the [Autotune] parameter is reset to 0. If the Autotune procedure
is aborted by the user, the drive parameters are not changed and the
[Autotune] parameter is reset to 0.
The following conditions will generate a fault during an Autotune
procedure:
• Incorrect stator resistance measurement
• Incorrect motor flux current measurement
• Load too large
• Autotune aborted by user
When the drive is initially powered up, the [Autotune] parameter is
defaulted to a value of 3(calculate). With this setting, any changes made by
the user to motor nameplate HP, Voltage, Frequency, or Power activates a
new calculation, which will update the [IR Voltage Drop] and [Flux
Current] parameters. This calculation is based on a typical motor with those
nameplate values. The Autotune parameter will not be reset to zero after
this calculation is performed; calculations will continue to be performed
every time motor nameplate values are changed.
Flux Current
This parameter displays only the flux producing component of output
current. It displays the amount of current that is out of phase with the output
voltage. This current is reactive current and is used to produce flux in the
motor.
Flux Up
[Flux Up Mode]
AC induction motors require flux to be established before controlled torque
can be developed. To build flux in these motors, voltage is applied to them.
PowerFlex drives have two methods to flux the motor.
The first method is a normal start. During a normal start, flux is established
as the output voltage and frequency are applied to the motor. While the flux
is being built, the unpredictable nature of the developed torque may cause
the rotor to oscillate even though acceleration of the load may occur. In the
motor, the acceleration profile may not follow the commanded acceleration
profile due to the lack of developed torque.
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