Hitachi L700 Series, Инструкция по эксплуатации, Страница: 107 / 263

Chapter 4 Explanation of Functions
4 - 45
■ Ambient temperature 50 ℃ derating (reference)
(NOTE) In case of replacing with L700 combined with LCR filter, please check the type code of LCR filter
and consult for compatibility (90-160kW).
4.2.36 Automatic carrier frequency reduction
- The automatic carrier frequency reduction function automatically
reduces the carrier frequency according to the increase in output current.
- To enable this function, specify "01" for automatic carrier frequency
reduction selection (b089).
Item Function code Range of data Description
Automatic carrier
frequency reduction
b089 00/01 00: invalid, 01: valid
- When the output current increases to 60%, 72%, 84%, or 96% of the rated current, this function reduces
the carrier frequency to 12, 9, 6, or 3 kHz, respectively. This function restores the original carrier frequency
when the output current decreases to 5% lower than each reduction start level.
0.4 ～ 55kW 75 ～ 132kW
Carrier frequency reduction start level
(Restoration level)
Carrier frequency after
reduction (kHz)
Carrier frequency reduction start level
(Restoration level)
Carrier frequency after
reduction (kHz)
Less than 60% of rated current 15.0 Less than 60% of rated current 10.0
60% (55%) of rated current 12.0 60% (55%) of rated current 8.0
72% (67%) of rated current 9.0 71% (66%) of rated current 6.0
84% (79%) of rated current 6.0 83% (78%) of rated current 4.5
96% (91%) of rated current 3.0 91% (86%) of rated current 3.0
- The rate of carrier frequency reduction is 2 kHz per second.
- The maximum limit of carrier frequency change by this function is the value specified for the carrier
frequency setting (b083); the minimum limit is 3 kHz.
Note: If 3 kHz or less frequency has been specified for b083, this function is disabled regardless of the
setting of b089.
b089: Automatic carrier frequency
reduction selection
b083: Carrier frequency setting
Related code
10.0kHz
60
Output current (%)
Carrier frequency
8.0kHz
6.0kHz
4.5kHz
3.0kHz
71 83 91
0
10 5
5.0kH
60 Output current (%)
Carrier frequency
3.0kH
6.0kH
4.0kH
2.5kH
71 83 91
0 10 5
11 to 75kW 90 to 160kW
30kW
Carrier frequency (kHz)
Derating of o
utpu
t current
22kW
200Vclass
0.5 2 4 6 8 10 12
11kW
37kW
15kW
18.5kW
60
55
100
95
90
85
80
75
70
65
50
45kW
55kW
75kW
110kW
Carrier frequency (kHz)
Derating of o
utpu
t current
60
55
100
95
90
85
80
75
70
65
45kW
37kW
400Vclass
0.5 4 6 8 10 12
11-18.5kW
30kW
22kW
55kW
2
50
75kW
90kW
132kW,160kW
1