4-61
890CS & 890CD Common Bus Units
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
Performing a Rotating Autotune
Note
The drive will not perform an Autotune when in Volts/Hz Mode (Open-Loop Drive.) An Autotune is not
necessary in this control mode.
Check that the motor can rotate freely in the forward direction. Ensure also that the motor is unloaded.
Ideally, the motor shaft should be disconnected. If the motor is connected to a gearbox this is okay,
provided that there is nothing on the output of the gearbox which could load the motor.
1.
In the QUICK SETUP menu, set MAX SPEED (S2) to the maximum speed at which you will operate
the drive in normal operation. The Autotune will characterise the motor up to 30% above this speed. If
you later wish to run faster than this, you will need to carry out another Autotune.
2.
Ensure that STO is disabled by connecting X11/01 and X11/03 to X14/03, and X11/04 to X14/04.
3.
Set AUTOTUNE ENABLE (S22) to TRUE, and start the drive
. The drive will carry out a Rotating
Autotune (indicated by the Run and Stop led’s flashing. This may take several minutes,
during
which
the motor will be accelerated to maximum speed and then brought to a stop. When complete, the drive is
returned to the stopped condition and the AUTOTUNE ENABLE parameter is reset to FALSE. In
Closed-loop Vector mode (with an encoder) the encoder sign has been adjusted by the Autotune feature.
IMPORTANT
Now perform a SAVE CONFIG to save your new settings. Refer to Chapter 9: “The Keypad” -
SAVE CONFIG.
