Hitachi L700 Series

Chapter 4 Explanation of Functions
4 - 44
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)
<0.5 to 8.0(kHz)> (*2)
*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.
*2 < >:applied for 90 to 160kW
*3 “Over current protection” , ” Overload restriction” , “Over current limiting” and “Electronic thermal
protection” might operate from the set value when “Carrier frequency setting” is used with less than
2kHz by a low value. Please set to 2kHz or more and use the setting of “Carrier frequency setting” for
such a situation.
Voltage
class
200 V class 400 V class
Inverter
capacity
Maximum
fc (kHz)
Derating at fc=12 kHz
Maximum
fc (kHz)
Derating at fc=12 kHz
<Derating at fc=8kHz>
11kW 12 100% 12 100%
15kW 7 90%(52.2Aor less) 12 100%
18.5kW 8 90%(65.7Aor less) 12 100%
22kW 6 90%(76.5Aor less) 8 95%(40.8Aor less)
30kW 5 90%(101.7Aor less) 8 90%(51.3Aor less)
37kW 8 80%(112Aor less) 10 80%(56.0Aor less)
45kW 3 75%(126.7Aor less) 9 90%(76.5Aor less)
55kW 8 90%(189Aor less) 8 80%(84Aor less)
75kW 3 90%(243Aor less) 6 75%(101.2Aor less)
90kW - - 7 90%(144Aor less)
110kW - - 3 80%(156Aor less)
132kW - - 4 85%(195.5Aor less)
160kW - - 3 70%(203Aor less)
< > indicate the setting range of 90 to 160kW
Carrier frequency (kHz)
Derating of output current
60
55
100
95
90
85
80
75
70
65
15kW
18.5kW,55kW
200Vclass
0.5
2
4 6
8 10
12
30kW
37kW
22kW
45kW
75kW
Carrier frequency (kHz)
Derating of output current
60
55
100
95
90
85
80
75
70
65
45kW
22kW
400Vclass
0.5 2
4
6
8
10 12
55kW
11-18.5kW
30kW
37kW
75kW
90kW
110kW
132kW
160k