ABB Motion control products 13
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speed data
(_ecCANNOT_FIT_L
OAD_MODEL)
motor inertia test, a torque
waveform is applied by the
motor and the motor speed
logged. A simple
inertia/damping model is then
fitted numerically to the
resulting torque/speed
characteristic. Error 4020
indicates that the fitting
process failed. A common
cause for this is lack of
sufficient information to fit the
load model.
Click Options... in the Autotune tool
and then select the Limits tab.
Increase the value in the Max Travel
box to allow the motor to rotate
further during the test and
consequently log more data. The
model fitting process can also fail for
certain types of load. For example,
loads with high coulomb or static
friction will not conform well to an
inertial load model. Likewise,
gravitational loading (i.e. vertical
axes) will cause problems for
autotuning. If the Measure the motor
inertia test continues to fail then the
subsequent Calculate the speed and
position gains test will also fail, as it
requires values for load inertia and
damping. It may be necessary to
manually tune the system using the
Fine-tuning tool's Speed and Position
tabs.
Workbench
Tuning
(_ecAUTOTUNE_TEST
_TIMEOUT)
voltage constant and
Measure the motor inertia
tests, current is applied to the
motor to accelerate the motor
and load. Error 4021
indicates that the rotor did
not reach a sufficient speed,
or travel a sufficient distance,
within the duration of the test.
Error 4021 can occur if the
torque (or force) generated
by the motor is insufficient to
overcome friction in the load.
Click Options... in the Autotune tool
and then select the Limits tab.
Increase the value in the Max Torque
box to allow the motor to generate
sufficient torque to overcome friction.
If the Measure the motor inertia test
continues to fail then the subsequent
Calculate the speed and position
gains test will also fail, as it requires
values for load inertia and damping.
It may be necessary to manually tune
the system using the Fine-tuning
tool's Speed / Velocity and Position
tabs.
Workbench
Tuning
far during test
(_ecAUTOTUNE_TEST
_OVERTRAVEL)
voltage constant and
Measure the motor inertia
tests, current is applied to the
motor to accelerate the motor
and load. Once the motor
has reached a sufficient
speed, the direction of
applied current is reversed to
bring the rotor to a halt within
specified travel limits. Error
4022 indicates that the test
was unable to impose these
limits.
Click Options... in the Autotune tool
and then select the Limits tab.
Increase the value in the Max Travel
box to allow the motor to rotate
further during the test. Also, try
reducing the value in the Max Speed
box. If the Measure the motor inertia
test continues to fail then the
subsequent Calculate the speed and
position gains test will also fail, as it
requires values for load inertia and
damping. It may be necessary to
manually tune the system using the
Fine-tuning tool's Speed / Velocity
and Position tabs.
Workbench
Tuning