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48 Unidrive M700 Getting Started Guide

Issue Number: 5

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

base speed in the direction

selected. The rotating auto-tune measures the power factor of

the motor.

To perform an auto-tune:

•Set Pr 00.040 = 1 for a stationary auto-tune or set Pr 00.040 = 2

for a rotating auto-tune

• Close the Drive Enable signal (terminal 31). The drive will

display ’Ready’.

• Close the run signal (terminal 26 or 27). 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

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.

WARNING

cos

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