Chapter 6 - Parameter Description [FU2]
106
FU2-38: Carrier Frequency
Code
LCD
Display
Description
Setting
Setting range
FU2-
38
Carrier freq
Carrier
Frequency
5 [kHz]
1 ~ 15 [kHz]
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;
200V
400V
30/37kW (40/50HP)
10kHz
10kHz
45/55kW (60/75HP)
8kHz
8kHz
75kW (100HP)
-
7kHz
Max carrier frequency for DB integrated models
(11~22kW/15~30HP) is 10kHz.
FU2-39: Control mode selection
l
Selects the control mode of the inverter
FU2-40
setting
LCD Display
Description
0
V/F
V/F Control
1
Slip compen
Slip compensation
2
Sensorless_S
Sensorless vector
control speed operation
3
Sensorless_T
Sensorless vector
control torque operation
4
Vector_SPD
Vector control speed
operation
5
Vector_TRQ
Vector control torque
operation
☞
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
Description
FU2-30
Motor select
Select motor capacity
FU2-32
Rated-Slip
Motor rated slip (Hz)
FU2-33
Rated-Curr
Motor rated current (rms)
FU2-34
Noload-Curr
Motor no load current (rms)
FU2-36
Efficiency
Motor efficiency (%)
FU2-37
Inertia rate
Motor inertia rate
FU2?Carrier freq
38 5 kHz
5
38
Factory Default:
5 kHz
5
FU2?Control mode
39 V/F
0
39
Factory Default:
V/F
0
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