Chapter 4 Explanation of Functions
4 - 43
4.2.35 Carrier frequency setting
The carrier frequency setting function (b083) allows you to change the
carrier frequency of the PWM waveform output from the inverter.
Increasing the carrier frequency can lower the metallic noise from the motor, but may increase the inverter
noise and current leakage.
You can use this function effectively to avoid resonance of the mechanical system and motor.
Item Function code Range of data Description
Carrier frequency
setting
b083 0.5 to 12.0 (kHz) (*1)
*1 The maximum carrier frequency varies depending on the inverter capacity.
When increasing the carrier frequency (fc), derate the output current as shown in the following table:
Derated output current is to be set as electronic thermal protection level (4.2.29).
Derating is not needed when electronic thermal level is already set to lower then derating level.
Voltage
class
400 V class
Inverter
capacity
Maximum
fc (kHz)
Derating at fc=12 kHz
5.5kW 12 100%
7.5kW 12 100%
11kW 12 100%
15kW 12 100%
18.5kW 10 90%(33.3Aor less)
22kW 6 80%(34.4Aor less)
30kW 8 90%(51.3Aor less)
37kW 8 70%(49.0Aor less)
45kW 8 80%(68.0Aor less)
55kW 6 85%(89.3Aor less)
5.5-15kW
45kW
Carrier frequency (kHz)
Derating of output current
60
55
100
95
90
85
80
75
70
65
30kW
0.5 2 4 6 8 10
12
55kW
18.5kW
37kW
22kW
400V class
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