01/02 AWB8230-1415GB
SLV and autotuning
171
SLV and autotuning
This section describes the function of the SLV (sensorless vector)
control and how to automatically determine motor data with the
autotuning function.
SLV (sensorless vector control)
SLV control can be used instead of the
U
/
f
characteristic to obtain
even higher torques at lower speeds and to achieve an even
greater speed stability, and therefore even steadier motor opera-
tion.
To achieve this, the present motor current and motor voltage are
used to calculate the magnetization current (machine flux-genera-
ting component) and the resistive current (torque-generating
component). In combination with the motor constants defined by
the motor type (which you can either configure manually or deter-
mine automatically with autotuning), these two current compon-
ents are sufficient for an optimal motor control.
The actual control is implemented with a powerful microprocessor
built into the frequency inverter. Even though SLV control does not
require actual motor speed feedback, (hence the term “sensor-
less”), it is nearly as powerful as vector control with motor speed
feedback.
You can choose between two versions of SLV control:
• Standard SLV control
• 0 Hz range SLV control
Standard SLV control
Before you can use standard SLV control, you need to make the
following settings:
X
Under PNU A044 (or PNU A244 for the second parameter set),
enter the value 03 (
a
Section “Voltage/frequency charac-
teristic and voltage boost“, Page 126).
X
Under PNU H002 (or PNU H202), specify whether the standard
motor data (value 00), the standard autotuning data (value 01)
or the adaptive autotuning data (value 03) will be used.
To use the standard autotuning data in the second parameter set,
enter the value 01 under PNU H202.
The adaptive autotuning data is only available for the first para-
meter set.
X
Under PNU H003 (or PNU H203), enter the motor rating, and
under PNU H004 (or PNU H204), the number of motor poles.
X
If necessary, change the controller’s response speed with
PNU H005 and (if motor resonance arises) the motor stabiliza-
tion constant with PNU H006.
0 Hz range SLV control
This function improves the torque characteristics in the range 0 to
2.5 Hz.
X
Under PNU A044 (or PNU A244 for the second parameter set),
enter the value 04 (
a
Section “Voltage/frequency charac-
teristic and voltage boost“, Page 126).
X
Then, continue as described in Section “Standard SLV control“.
Autotuning
With the autotuning function, the motor constants of the
connected motors can be automatically determined and written to
the memory locations of PNU H030 to H034 (standard parameter
set) or PNU H230 to H234 (second parameter set). You do not
have to enter the constants manually in this case.
Before you carry out an autotuning, do the following:
X
Under PNU F002 and F003, enter the first acceleration and
deceleration time.
To allow autotuning to correctly determine the motor’s moment of
inertia, the same value must be entered in both parameters. The
smaller the entered acceleration and deceleration time, the faster
can autotuning be carried out. Make sure that no fault messages
occur and that the first parameter set is selected.
The Autotuning function can not be used in conjunction with PID
control and the frequency inverter must not be in RUN mode.
Make sure, that the motor rating is no more than one stage below
the frequency inverter rating, as the autotuning function could not
otherwise obtain correct data.
Motor data
Parameter set
1
2
3
Standard motor data
j
j
j
Autotuning motor data
j
j
–
Adaptive autotuning data
j
–
–
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