Toshiba TOSVERT VF-MB1 Instruction Manual page 118

9) Cautions for vector control
1) When performing vector control, look at the motor's name plate and set the following parameters.
5
 (Base frequency 1),  (Base frequency voltage 1),  (Motor rated capacity), 
(Motor rated current),  (Motor rated speed)
2) The sensorless vector control exerts its characteristics effectively in frequency areas below the base
frequency (). The same characteristics will not be obtained in areas above the base frequency.
3) Set the base frequency to anywhere from 40 to 120Hz during vector control (=).
4) Use a general purpose squirrel-cage motor with a capacity that is the same as the inverter's rated capacity or
one rank below. The minimum applicable motor capacity is 0.1kW.
5) Use a motor that has 2-8 P.
6) Always operate the motor in single operation (one inverter to one motor). Sensorless vector control
cannot be used when one inverter is operated with more than one motor.
When using a combination of several motors, set the V/F constant (=).
7) The maximum length of wires between the inverter and motor is 30 meters. If the wires are longer than 30
meters, set standard auto-tuning with the wires connected to improve low-speed torque during sensorless
vector control.
However the effects of voltage drop cause motor-generated torque in the vicinity of rated frequency to be
somewhat lower.
8) When a reactor is connected between the inverter and a motor, the motor's generated torque may fall.
Setting auto-tuning may also cause a trip () rendering sensorless vector control unusable.
Voltage
100%
: Area in which the
V/f 5-point cannot
be set
0
E-24
1Hz
Frequency

E6581697