30
Note1:.After setting f104, set f204 to adjust in detail.
NO. Parameter Name Setting Range Default
f205 Exciting current coefficient 100~130 % 100
f205 is 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 f205.
Note: This parameter should be adjusted only when enough torque cannot be obtained,
even though auto-tuning (f100 = 2) was made after the setting of the parameters
f204 and f203. 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.
NO. Parameter Name Setting Range Default
f206 Voltage boost 2 0~30 % varies by model
Setting method is the same as f202.
NO. Parameter Name Setting Range
Default
f207 Speed control response coefficient
1~150 40
f208 Speed control stability coefficient 1~100 20
Use these two parameters to adjust the speed of response and stability 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. If this
assumption does not hold, calculate the values to be entered in f207 and f208, using the
following equations. f207 =
, Where ‘a’ is the times by which
the moment of inertia of the load is
larger than that of the motor. After the above
adjustments, if necessary, make fine adjustments as described below.
• To increase(reduce) the response speed: Increase (reduce) the setting of f207.
• If overshooting or hunting occurs: Increase the setting of f208.
• If reduction gears or the like squeak: Increase the setting of f208.
• If an over-voltage trip occurs on completion of acceleration: Increase the setting of f208.
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General