Unidrive M702 / HS72 Control Getting Started Guide 37
Issue Number: 4
Safety information Introduction Control connections Getting started
Basic parameters
(Menu 0)
Running the motor Further information
Autotune
The drive is able to perform either a stationary or a rotating auto-tune.
The motor must be at a standstill before an auto-tune is enabled. A
rotating auto-tune should be used whenever possible so the measured
value of power factor of the motor is used by the drive
• A stationary auto-tune can be used when the motor is loaded and it
is not possible to uncouple the load from the motor shaft.
A stationary auto-tune 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 auto-tune does
not measure the power factor of the motor so the value on the motor
nameplate must be entered into Pr 00.043.
• A rotating auto-tune should only be used if the motor is uncoupled.
A rotating auto-tune first performs a stationary auto-tune before
rotating the motor at
2
/
3
base speed in the direction selected.
The rotating auto-tune measures the power factor of the motor.
To perform an auto-tune:
•Set Pr00.040 = 1 for a stationary auto-tune or set Pr 00.040 = 2 for a
rotating auto-tune
• Close the Drive Enable signal (terminal 11 and 13). The drive will
display ’Ready’.
• Close the run signal (terminal 7 or 8). The lower display will flash
’Autotune’ while the drive is performing the auto-tune.
• Wait for the drive to display ’Ready’ or ‘Inhibit’ and for the motor to
come to a standstill.
• Remove the drive enable and run signal from the drive.
Save
parameters
Select ‘Save Parameters’ in Pr mm.000 (alternatively enter a value of
1000 in Pr mm.000) and press red reset button or toggle the
reset digital input.
Run Drive is now ready to run
Action Detail
A rotating auto-tune 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 enable 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.
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