User Manual Instruction Manual

Application Notes
13-3
Motor NP Hertz (43)
Motor NP Power (45)
Dynamic or Static Autotune tests will be performed during the Autotune Procedures.
Dynamic - the motor shaft will rotate during this test. The dynamic autotune
procedure determines both the stator resistance and motor flux current. The test to
identify the motor flux current requires the load, including gearing, to be uncoupled
from the motor to find an accurate value. If this is not possible then the static test
can be performed.
Static - the motor shaft will not rotate during this test. The static test determines
only IR Voltage Drop (62). This test does not require the load to be uncoupled from
the motor.
The static and dynamic tests can be performed during the Start-up routine on the LCD
OIM. The tests can also be run manually by setting the value of the Autotune (61)
parameter to 1 “Static Tune” or 2 “Rotate Tune”.
13.2.3 Alternate Methods to Determine IR Voltage Drop (62) & Flux
Current Ref (63)
If it is not possible or desirable to run the Autotune tests, there are three other
methods for the drive to determine the IR Voltage Drop (62) and Flux Current Ref (63)
parameters:
The first method is used when the motor nameplate parameters are left at default.
When the drive is initially powered up, the Autotune (61) parameter is defaulted to a
value of 3 “Calculate”. The values for IR Voltage Drop (62) and Flux Current Ref (63)
are calculated based on the default motor nameplate data. This is the least preferred
method.
The second method calculates IR Voltage Drop (62) and Flux Current Ref (63) from
the user-entered motor nameplate data parameters. When Autotune (61) is set to 3
“Calculate”, any changes made by the user to motor nameplate HP, Voltage, FLA, or
Frequency activates a new calculation. This calculation is based on a typical motor
with those nameplate values.
Finally, if the stator resistance and flux current of the motor are known, the user can
calculate the voltage drop across the stator resistance. Autotune (61) is set to 0
“Ready” and stator resistance and flux current values are directly entered into the Flux
Current Ref (63) and IR Voltage Drop (62) parameters.
13.2.4 Autotune Procedure for Flux Vector
For FVC vector control an accurate model of the motor must be used. For this reason,
the motor data must be entered and the autotune tests should be performed with the
connected motor.
Motor nameplate data must be entered into the following parameters for the Autotune
procedure to obtain accurate results:
Motor NP Volts (41)