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the motor
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120
Affinity User Guide
www.controltechniques.com Issue Number: 5
Autotune
The drive 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.
It is highly recommended that a rotating autotune is performed (Pr
0.40
set to 2).
•
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’ or ‘Off’.
•
Press the blue
auto or green
hand button. The display will flash‘Autotune in progress’,
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 13
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
NOTE
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 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
∅
σ
L
S
T
Nm
N rpm
saturation
break-
points
R
S
L
S
Summary of Contents for Affinity
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