User guide
Unidrive SP Short Form Guide 63
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
stationary autotune will give moderate performance whereas a rotating
autotune will give improved performance as it measures the actual
values of the motor parameters required 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. The
stationary autotune measures the stator resistance and transient
inductance of the motor. These are used to calculate the current
loop gains, and at the end of the test the values in Pr 0.38 and
Pr 0.39 are updated. 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 stator inductance of the motor and
calculates the power factor.
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
T
Nm
N rpm
saturation
break-
points
R
S
L
S