Control Techniques Unidrive M400 Quick Start Manual page 38

00.038
RW Num
OL
RFC-A
Defines the auto-tune test to be performed.
There are two autotune tests available in open loop mode, a stationary and a rotating test. A rotating
autotune should be used whenever possible so the measured value of power factor of the motor is
used by the drive.
Open Loop and RFC-A:
1. A stationary autotune can be used when the motor is loaded and it is not possible to remove the
load from the motor shaft. To perform a Stationary autotune, set Pr 00.038 to 1,
2. A rotating autotune should only be used if the motor is unloaded. A rotating autotune first
performs a stationary autotune, as above, then a rotating test is performed in which the motor is
accelerated with currently selected ramps up to a frequency of Rated Frequency (00.039) x 2/3,
and the frequency is maintained at that level for 4 seconds. To perform a Rotating autotune, set
Pr 00.038 to 2.
RFC-A only:
3. This test measures the total inertia of the load and the motor. A series of progressively larger
torque levels are applied to the motor to accelerate the motor up to 3/4 x Motor Rated Speed
(Pr 00.007) to determine the inertia from the acceleration/deceleration time.
Following the completion of an autotune test the drive will go into the inhibit state. The drive must be
placed into a controlled disable condition before the drive can be made to run at the required
reference. The drive can be put in to a controlled disable condition by removing the Safe Torque Off
signal from terminals 31 and 35, setting the Drive Enable to Off (0) or disabling the drive via the
Control Word and Control Word Enable
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
WARNING
signal or removing the drive enable.
00.039
RW Num
OL
RFC-A
Enter the value from the rating plate of the motor. Defines the voltage to frequency ratio applied to
the motor.
38
Autotune
0 to 2
0 to 3
Motor Rated Frequency
0.00 to 550.00 Hz
NC
0
50 Hz: 50.00 Hz
60 Hz: 60.00 Hz
Unidrive M400 Control Quick Start Guide
US
US
Issue Number: 3