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7
7. BASIC OPERATIONS AND TRIAL RUN
7.10 AUTO-TUNING
These four function parameters can define
required AO curve.
If “b” represents zero offset, “k” represents
gain, “Y” represents actual output of the AO,
and “X” represents output frequency, then the
actual output is Y=kX + b.
Zero offset coefficient 100% of AO1 and AO2
corresponds to 10 V or 20 mA. A standard
output is the value corresponding to 0 to 10 V
or 0 to 20 mA without offset or gain.
For example, AO is used for output of
frequency reference. To implement output of 8
V at 0 Hz and output of 4 V at 40 Hz, set F5-11
to -0.5 and set F5-10 to 80%.
You can obtain the parameters of a controlled motor through motor auto-tuning.
Motor auto-tuning methods are dynamic auto-tuning, static auto-tuning 1, and
static auto-tuning 2. You can also enter the motor parameters manually.
Figure 7-9-2 AO signal correction characteristic curve
Auto-tuning Method
Application
Result
Dynamic auto-tuning
with no-load F1-37 = 2
Applied to applications where motor can be disconnected from load.
Best
Dynamic auto-tuning
with load F1-37 = 2
Applied to applications where motor cannot be disconnected from load
and dynamic auto-tuning is not allowed. The load friction force is small
and the motor is appropriately idle when running at a constant speed.
The effect is better
with smaller
friction force.
Static auto-tuning 1
F1-37 = 1
Applied to applications where the motor cannot be disconnected from
the load and dynamic auto-tuning is not allowed.
OK
Static auto-tuning 2
F1-37 = 3
Applied to applications where the motor cannot be disconnected from the
load and dynamic auto-tuning is not allowed. This mode is recommended
for static auto-tuning. It lengthens the auto-tuning time compared to static
auto-tuning 1.
Better
Manual parameter
input
Applied to applications where the motor cannot be disconnected from
the load. Copy parameters of motors of the same model that have been
auto-tuned to F1-00 to F1-10.
Better
AO1 output
(Y after correction)
Parameter
to be output
(X before correction)
k=F5-11
b=F5-10
