Carrier Frequency Setting - Hitachi SJ700B Series Instruction Manual

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
Carrier frequency
setting
*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
400 V class
class
Inverter Maximum
Derating at fc=12 kHz
capacity fc (kHz)
5.5kW 12
7.5kW 12
11kW 12
15kW 12
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)
Function code
b083 0.5 to 12.0 (kHz) (*1)
100%
100%
100%
100%
400V class
100
95
22kW
90
85
80
75
70
65
60
55
0.5 2 4 6
Carrier frequency (kHz)
Chapter 4 Explanation of Functions
Range of data
30kW
5.5-15kW
18.5kW
55kW
45kW
37kW
8 10 12
4 - 43
Description