Toshiba TOSVERT VF-S11 Instruction Manual page 148

Setting procedure Adjust the following parameters:
6
6.17.2 Setting motor constants 2 (Details)
: Set the compensation gain for the slipping of the motor. A higher slip frequency reduces motor
slipping correspondingly. After setting
: Adjust the primary resistive component of the motor. Decreases in torque due to a possible voltage
drop during low-speed operation can be suppressed by setting a large value in this parameter.
(Perform adjustments according to the actual operation.)
: Set the rated current of the motor. For the rated current, see the motor's nameplate or test report.
: Set the ratio of the no-load current of the motor to the rated current. Enter the value in % that is
obtained by dividing the no-load current specified in the motor's test report by the rated current.
: Set the rated rotational speed of the motor. For the rated current, see the motor's nameplate or
test report.
: Using this parameter along with
: Using this parameter along with
* 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
the following equations.
= 40× a 3
f419= 20× a 3
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 the response speed: Increase the setting of
• To reduce the response speed: Decrease the setting of
• If overshooting or hunting occurs: Increase the setting of
• If reduction gears or the like squeak: Increase the setting of
• If an over-voltage trip occurs on completion of acceleration: Increase the setting of
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 f418 and f
the upper-limit frequency if the inverter is set so as to accelerate the load in the shortest
possible time.
: If the rated capacity of the motor is one size smaller than that of the inverter, lower the thermal
protective level according to the rated current of the motor.
* Sensorless vector control may not operate properly if the motor capacity differs from the
applicable rated capacity of the inverter by more than two grades.
: Exciting current coefficient
: Stall prevention control coefficient 1
: Stall prevention control coefficient 2
: Motor adjustment coefficient
: Maximam voltage adjustment coefficient
: Waveform switching adjustment coefficient
, set to adjust in detail.
, adjust the speed of response to the frequency command.
, adjust the speed of response to the frequency command.
F-54
E6581158
418 and 419, using
.
.
.
.
.
, the frequency may exceed