Carrier Frequency Setting - Hitachi L700 SERIES Instruction Manual

Chapter 4 Explanation of Functions

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.
*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
200 V class
class
Inverter Maximum
capacity fc (kHz)
11kW 12
15kW 7
18.5kW 8
22kW 6
30kW 5 90%(101.7Aor less)
37kW 8
45kW 3 75%(126.7Aor less)
55kW 8
75kW 3
90kW -
110kW -
132kW -
160kW -
< > indicate the setting range of 90 to 160kW
200Vclass 22kW
30kW
100
95
90
75kW
85
80
75
70
65
60
55
0.5 2 4
Carrier frequency (kHz)
Function code
b083
Maximum
Derating at fc=12 kHz
fc (kHz)
100% 12
90%(52.2Aor less) 12
90%(65.7Aor less) 12
90%(76.5Aor less) 8
8
80%(112Aor less) 10
9
90%(189Aor less) 8
90%(243Aor less) 6
- 7
- 3
- 4
- 3
15kW
18.5kW,55kW
37kW
45kW
6 8 10 12
Range of data
0.5 to 12.0 (kHz) (*1)
<0.5 to 8.0(kHz)> (*2)
400 V class
Derating at fc=12 kHz
<Derating at fc=8kHz>
100%
100%
100%
95%(40.8Aor less)
90%(51.3Aor less)
80%(56.0Aor less)
90%(76.5Aor less)
80%(84Aor less)
75%(101.2Aor less)
90%(144Aor less)
80%(156Aor less)
85%(195.5Aor less)
70%(203Aor less)
400Vclass
100
95
90
85
80
75
70
65
60
55
0.5 2
4 - 44
Description
90kW 45kW
132kW
55kW
110kW
160k
10 12
4 6
8
Carrier frequency (kHz)
11-18.5kW
22kW
30kW
37kW
75kW