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E6581528
F-37
6
Examples of setting the motor constants
Inverter : VFAS1-6150PL
Motor : 15kW-6P-50Hz
1) Set the V/f control mode selection at (Sensorless vector control).
2) Set , , , and , as specified on the motor nameplate.
3) Set the auto-tuning 1() at .
4) Set the auto-tuning 1 () at .
(2) Setting sensorless vector control and manual independently
Setting motor constants
Perform all operations in the flowchart on the previous page. If the motor specifications are unknown, enter only the
motor capacity () and set parameter to . After that, run the motor and set other parameters with the
following explanation about parameter adjustments as a guide.
This section describes how to set motor constants. Select the items to be improved and change the related motor
constants.
(1) Slip frequency gain
This parameter is to adjust the slippage of the motor.
Setting this parameter at a larger number can reduce the slippage of the motor. However, setting it at an excessively
large number may result in hunting, etc., and thus cause an unstable operation.
(2) Motor constant 1 (Torque boost) (Motor test reports may be useful.)
This parameter is to adjust the primary resistance of the motor. Setting this parameter at a larger value can prevent
the drop of the motor torque in low speed ranges due to a voltage drop. However, setting it at an excessively large
number may result in large current in low speed range and appearance of an overload trip, etc.
(3) Motor constant 2 (No-load current) (Motor test reports may be useful.)
This parameter is to adjust the exciting inductance of the motor. The larger the set value, the more exciting current
can be increased. Note that specifying a too large value for the motor constant may cause hunting.
(4) Motor constant 3 (Leak inductance) (Motor test reports may be useful.)
This parameter is to adjust the leakage inductance of the motor. The larger the set value, the larger torque the motor
can produce in high-speed ranges.
(5) Motor constant 4 (Rated slip)
This parameter is to adjust the secondary resistance of the motor. The amount of compensation for slip increases
with increase in this value.
(6) (Speed loop proportional gain)
This parameter is to adjust the gain responsive to speed. Specifying a large gain increases the speed of response,
but specifying an excessively large gain may result in the occurrence of hunting. If operation is unstable and hunting
occurs, operation can be stabilized in most cases by reducing the gain.
(7) (Moment of inertia of load)
This parameter is used to adjust the excess response speed. Specifying a large value reduces the amount of
overshoot at the completion of acceleration. So, specify a value appropriate to the actual moment of inertia of the
load.