N700 Operating Instructions and Parts Manual
6. Explanation of F-Group Function
53
(2) Reduced torque characteristic (VP1.7 power)
This characteristic can be used when a large starting torque isn’t required.
At low speeds, it can cause the improvement of efficiency, low noise and low vibration
because of lowering the output voltage. V/f characteristic is as follows.
Section
ⓐ
: The limit from 0 to 10% of the base frequency is the constant characteristic.
(ex) If the base frequency is 60Hz, the limit from 0 to 6Hz is constant
characteristic.
Section
ⓑ
: The limit from 10% of the base frequency to the base frequency is reduced
torque characteristic. The voltage outputs in the curved of 1.7 power for the
frequency.
Section
ⓒ
: The voltage is constant from the base frequency to the maximum frequency.
(3) Reduced torque characteristic (VP2.0 power)
The voltage outputs in the curved of 2.0 power for the frequency.
(4) Free V/f setting
The free V/f setting represents optional V/f characteristics by setting the voltage and
frequency in seven parts. (A059~A072)
(5) Sensorless
vector
control
①
When this function is performed, raised torque running is possible at 0.5Hz above range
by the original torque control.
②
This function is the method that the revolution of motor and output torque are estimated
by output current, voltage of the inverter and motor constant of setting. It is possible to
operate with high starting torque and high accuracy at low frequency.
③
In the case of using this function, please select the suitable motor constant of using the
motor according to the parameter of "selection of motor constant".
④
If this inverter operates less than twice capacity for the maximum adopted motor, the full
⑤
performance may not be demonstrated.
Note)
Please refer to the part of sensorless vector control for details.
(6) Sensored vector control / 0Hz-Sensored vector control
①
It is possible to make a motor get the high efficient operation by motor speed signal.
②
Please use the feedback option card for using this function.
Note)
Please refer to the feedback option card manual for details.
Note)
Please set the carrier frequency (b010) as 2kHz or over 2kHz when use the motor
control mode(F012/F212) as 5,6,7.
6.11
Motor voltage selection (F013)
Please select the value of motor voltage to the nominal voltage of the motor, this value can be
found on the nameplate of the motor. If the motor voltage exceeds the nominal voltage of the
motor, there is a risk of damage to the motor.
Code
Function name
Initial value
Unit
Setting range
Contents
F013
Motor voltage selection
(the motor rated
voltage)
220
V
200/215/220/230
/240
200V(LF - model) : When
inverter is 200 V class,
selection is possible.