Commander GP User Guide
Issue code: gpxu2
2-12 Getting Started
Autotune
Autotune is a sequence of tests performed by the
Drive. The results of the tests are subsequently
used by the Drive for controlling the motor.
Autotune should be used after the motor
parameters have been entered, but before the Drive
is used. Normally (and if the motor is not changed),
Autotune needs performing only once.
Warning
During the following
procedures, the Drive will
power the motor and cause
the shaft to rotate at up to
2
/
3
full speed. Before
starting, make sure it will be
safe for the motor to be run.
Note
To stop the test at any time, press .
The motor will then coast to a stand-still
and the test will not be completed.
If the Drive trips
If the Drive trips during the test, note the trip code
that appears on the upper display and refer to
Appendix E Diagnostics. The test will not be
completed.
Direction of rotation
Warning
Stored charge
The Drive contains capacitors
that remain charged to a
potentially lethal voltage after
the
AC supply has been
disconnected. If the Drive has
been energized, the
AC supply
must be isolated at least
ten minutes before work may
continue.
The motor shaft should rotate clockwise as viewed
from the free end of the shaft during Autotune. If
the shaft rotates in the reverse direction, stop the
test, remove the
AC supply and check the motor
connections. If required, change the motor phase
connections and repeat Autotune.
Procedure
Note
If the settings of parameters 0.41 to 0.47
are changed by a user after Autotune has
been performed, it is essential that
Autotune is repeated.
1. Ensure the motor is unloaded and at a stand-still.
2. Ensure the EXTERNAL TRIP contact is closed.
3. Follow this step only if the Drive has previously
been set up and both of the following have
occurred...
• The setting of parameter 0.07 Voltage mode
selector has been changed to Ur
• A different motor is now connected to the
Drive
... change the setting of parameter 0.07 to
Ur_I. (See Open-loop voltage control modes later
in this chapter.)
4. Disconnect, then after at least 10 seconds,
re-connect the
AC supply (this causes the Drive
to measure the stator resistance of the motor
— it is essential for the Drive to be aware of the
actual value of stator resistance for Autotune
to be performed correctly).
5. Set parameter 0.40 Autotune enable at 1. The
following tests are performed:
• The motor is accelerated up to two-thirds
rated frequency in the forward direction
while the magnetizing current is measured
• The motor is decelerated to a stand-still
6. Parameter 0.43 Motor – power factor is
automatically updated.
7. Parameter 0.40 is automatically returned to zero.
Saving the values
1. Set parameter 0.00 at 1000.
2. Press
. The display returns to Parameter
mode. Do not press any keys within eight
seconds; the display then enters Status mode.
3. Momentarily press
to reset the Drive.
Changing the user-interface mode
Change the user-interface mode, as required. If jog
is required, select Terminal mode (jog is available
only in Macros 0, 1, 4).
User-interface mode Set parameter 0.05 at...
Terminal 0
Keypad 4
Note
The main function of parameter 0.05 is a
reference selector which has other settings
that operate the Drive in Terminal mode.
At this stage, do not use any of these other
settings.
Use of parameter 0.05 is described for
Macros 0 and 1 in Chapter 3 Setting Up the
Drive.
