Chapter 6 - Parameter Description [FU2]
6-31
FU2-40~46 [Motor parameters] is automatically
determined by FU2-40 [Motor selection]. Most
suitable motor capacity corresponding inverter
capacity is set as factory setting, but the following
parameters can be adjusted if necessary.
FU2-40~46 [Motor related parameters for Slip
Compensation]
Code LCD Display Description
FU2-40 Motor select Select motor capacity
FU2-42 Rated-Slip Motor rated slip (Hz)
FU2-43 Rated-Curr Motor rated current
(rms)
FU2-44 Noload-Curr Motor no load current
(rms)
FU2-45 Efficiency Motor efficiency (%)
FU2-46 Inertia rate Motor inertia rate
Note: Incorrectly set FU2-44 [Motor No-load
Current] value may weaken the Sensorless control.
◈ Sensorless (Sensorless vector speed control)
operation:
Use it when 1) high starting torque is needed at low
speed 2) load fluctuation is high 3) rapid response is
needed. To use this function, set FU2-40~46 [Motor
parameters] and FU2-60 [Control mode select]
properly.
If not using LG 220V/440V Class motor: Set “Yes”
in FU2-61 [Auto tuning] first before using this
control.
Related parameters: FU2-40~46, FU2-60, FU2-
62~66
Code LCD display Parameter
FU2-62 RS Stator resistance
FU2-63
Lsigma
Leakage inductance
FU2-65
SL P-gain
Sensorless P gain
FU2-66 SL I-gain Sensorless I gain
[Guide for Optimal Use of Sensorless Vector
Control]
For optimal use of the sensorless control, the
following conditions should be met. If one of the
following conditions is not satisfied, the inverter may
malfunction due to insufficient torque, irregular
rotation, or excessive motor noise. In this case, it is
recommended to use V/F control.
▣ Use a motor capacity that is equal to or one
horsepower level lower than the inverter
capacity.
▣ Two types of motor parameters can be set for
one inverter, but use only one type for sensorless
control.
▣ Use a LG 220V/440V(0.4kW~30kW) class
motor. If other makers’ motor or a LG
220V/380V dual rating motor is used, utilize the
auto tuning feature in FU2-61 [Auto tuning]
before starting.
▣ Set appropriate values for the electronic thermal
function, the overload limit function and the
stall prevention. The set values should exceed
100% of the rated motor current.
▣ When DRV–04 [Frequency Mode] is set to
“V1”, “V1S”, “I”, or “V1+I”, wiring should be
conducted to eliminate potential noise influence
with the frequency reference.
▣ Pole number of the motor should be 2 pole, 4
pole, or 6 pole.
▣ The distance between the inverter and the motor
should not exceed 100m (328 ft).
[Cautions on Sensorless Vector Control]
▣ Forced-cooling should be used for the motor
when the average operating speed is under 20Hz
and more than 100% load is used constantly.
▣ Motor may rotate 0.5% faster than the maximum
speed if the motor temperature does not reach
normal operating temperature.
▣ Utilize the auto-tuning feature when the motor
reaches normal temperature (average
temperature where the motor normally operates).
▣ Output torque may be reduced when an output
filter option is used between the inverter and the
motor.
▣ Overcurrent trip may occur if FU2-62 [Stator
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