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E6581381
F-48
6
H: Using this parameter along with H, adjust the speed of response to the frequency command.
H: Using this parameter along with H, adjust the speed of response to the frequency command.
* How to make adjustments according to the moment of inertia of the load
The moment of inertia of the load (including that of the motor shaft) was set at the factory on the
assumption that it would be three times as large as that of the motor shaft.
Adjust H, H with the ratio of inertia in case load inertia is different from three times
of the motor inertia.
When making the above adjustments, increase or decrease settings in steps of 10% or so while
checking how things change.
Note also that, depending on the settings of H and H, the frequency may exceed
the upper-limit frequency if the inverter is set so as to accelerate the load in the shortest
possible time.
6.15.2 Setting motor constants 2 (Details)
H : Exciting current coefficient
H
: Stall prevention control coefficient 1
H
: Stall prevention control coefficient 2
H
: Motor adjustment coefficient
H
: Maximam voltage adjustment coefficient
H
: Waveform switching adjustment coefficient
* The following parameters enables you to make adjustments more finely.
Title Function Adjustment range Default setting
H Exciting current coefficient 100-130 (%) 100
H
Stall prevention control
coefficient 1
10-250 100
H
Stall prevention control
coefficient 2
50-150 100
H
Motor adjustment coefficient 0-200
Depends on
the capacity
H
Maximam voltage adjustment
coefficient
90-120 (%) 104
H
Waveform switching
adjustment coefficient
0.1-14.0(kHz) 14.0
H: Used to fine adjust the magnetic field increase rate in low-speed range. To increase the torque in
low-speed range, specify a larger value for H. Note that this parameter should be adjusted
only when enough torque cannot be obtained, even though auto-tuning (H=) was made
after the setting of the parameters H through H. Note also that adjusting this
parameter may cause an increase in the no-load current in low-speed range. If the no-load current
exceeds the rated current, do not adjust this parameter.
H: Using this parameter along with H adjusts characteristics in a region in which the frequency
is above the base frequency (region where the field is weak).