Fu2-38: Carrier Frequency; Fu2-39: Control Mode Selection - LG SV-iS5 Instruction Manual

Chapter 6 - Parameter Description [FU2]

FU2-38: Carrier Frequency

FU2?Carrier freq
38 5 kHz
Factory Default:
5 kHz
LCD
Code Description
Display
FU2- Carrier
Carrier freq
38 Frequency
This parameter affects the audible sound of the motor,
noise emission from the inverter, inverter termperature,
and leakage current. If the ambient temperature where
the inverter is installed is high or other equipment may
be affected by potential inverter noise, set this value
lower. If set above 10kHz, use it by reducing 5%[1kHz]
of the rated current. Setting Carrier freqeuncy set below
2.5[kHz] when the FU2-39 [Control mode selection] is
set to Vector_SPD, Vector_TRQ could weaken the
control performance.
Note) Max carrier frequency for inverters above
40HP(30kW) are indicated as below;
30/37kW (40/50HP)
45/55kW (60/75HP)
75kW (100HP)
Max carrier frequency for DB integrated models
(11~22kW/15~30HP) is 10kHz.

FU2-39: Control mode selection

FU2?Control mode
39 V/F
Factory Default:
V/F
l Selects the control mode of the inverter
FU2-40
LCD Display
setting
0 V/F
1 Slip compen
2 Sensorless_S
3 Sensorless_T
4 Vector_SPD
5 Vector_TRQ
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38 5
5
Setting Setting range
5 [kHz] 1 ~ 15 [kHz]
200V 400V
10kHz 10kHz
8kHz 8kHz
- 7kHz
39 0
0
Description
V/F Control
Slip compensation
Sensorless vector
control speed operation
Sensorless vector
control torque operation
Vector control speed
operation
Vector control torque
operation
106
☞ Note: Setting Vector_SPD, Vector_TRQ is only valid
when the inverter is equipped with SUB-B board and
EXT-12 [F mode] is set to Feed-back. Vector control
comprises of Vector_SPD, Vector_TRQ with
Sensorless_S and Sensorless_T.
l V/F control:
This parameter controls the voltage/frequency ratio
constant. It is recommended to use the torque boost
function when a greater starting torque is required.
Related function: FU1-26~28 [Torque boost]
l Slip compensation:
This function is used to maintain constant motor speed.
To keep the motor speed constant, the output frequency
varies within the limit of slip frequency set in FU2-32
according to the load current. For example, when the
motor speed decreases below the reference speed
(frequency) due to a heavy load, the inverter increases
the output frequency higher than the reference
frequency to increase the motor speed. The inverter
increases or decreases the output by delta frequency
shown below.
Delta freq = Rated slip * (Output current - Motor
No load current) / rated current - Motor No load
current)
Output freq = Reference freq + Delta freq
☞ Note: Motor parameters must be set correctly for
optimal performance of control.
FU2-32~36 [Motor related parameters] is automatically
determined by FU2-30 [Rated Motor selection]. Most
suitable motor capacity corresponding inverter capacity
is set as factory setting, but the following setting value
can be adjusted if necessary.
Related parameter: FU2-30~37 [Motor related
parameters]
Code LCD Display
FU2-30 Motor select
FU2-32 Rated-Slip
FU2-33 Rated-Curr
FU2-34 Noload-Curr
FU2-36 Efficiency
FU2-37 Inertia rate
Description
Select motor capacity
Motor rated slip (Hz)
Motor rated current (rms)
Motor no load current (rms)
Motor efficiency (%)
Motor inertia rate