User guide
Unidrive SP Short Form Guide 59
Issue Number: 2 www.controltechniques.com
Safety
Information
Product
Information
Mechanical
Installation
Electrical
Installation
Getting Started Basic parameters
Running the
motor
SMARTCARD
Advanced
parameters
Diagnostics
UL Listing
Information
Autotune
Unidrive SP is able to perform either a stationary or a rotating
autotune. The motor must be at a standstill before an autotune is
enabled. A rotating autotune should be used whenever possible so
the measured value of power factor of the motor is used by the
drive.
• A stationary autotune can be used when the motor is loaded
and it is not possible to uncouple the load from the motor shaft.
A stationary autotune measures the stator resistance of the
motor and the voltage offset in the drive. These are required for
good performance in vector control modes. A stationary
autotune does not measure the power factor of the motor so
the value on the motor nameplate must be entered into
Pr 0.43.
• A rotating autotune should only be used if the motor is
uncoupled. A rotating autotune first performs a stationary
autotune before rotating the motor at
2
/
3
base speed in the
direction selected. The rotating autotune measures the power
factor of the motor.
To perform an autotune:
•Set Pr 0.40 = 1 for a stationary autotune or set Pr 0.40 = 2 for a
rotating autotune
• Close the Drive Enable signal (terminal 31). The drive will
display ’rdY’.
• Close the run signal (terminal 26 or 27). The lower display will
flash ’Auto’ and ’tunE’ alternatively, while the drive is
performing the autotune.
• Wait for the drive to display ’rdY’ or ‘inh’, and for the motor to
come to a standstill.
If the drive trips, see Chapter 10 Diagnostics on page 107.
Remove the drive enable and run signal from the drive.
Save
parameters
Enter 1000 in Pr xx.00
Press the red reset button or toggle the reset digital input
(ensure Pr xx.00 returns to 0)
Run Drive is now ready to run
Action Detail
A rotating autotune will cause the motor to accelerate up
to
2
/
3
base speed in the direction selected regardless of
the reference provided. Once complete the motor will
coast to a stop. The run signal must be removed before
the drive can be made to run at the required reference.
The drive can be stopped at any time by removing the
run signal or removing the drive enable.
WARNING
cos
∅
σ
L
S
R
S