Automatic Carrier Frequency Reducation - Hitachi L700 SERIES Instruction Manual

■Ambient temperature 50℃ derating (reference)
200Vclass
100
95
90
85
80
75
70
65
60
55
50
4
0.5 2
Carrier frequency (kHz)
(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
Automatic carrier
frequency reduction
- 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.
Carrier frequency reduction start level
(Restoration level)
Less than 60% of rated current
60% (55%) of rated current
72% (67%) of rated current
84% (79%) of rated current
96% (91%) of rated current
11 to 75kW
Carrier frequency
10.0kHz
8.0kHz
6.0kHz
4.5kHz
3.0kHz
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.
22kW
75kW
18.5kW
15kW
37kW 55kW
11kW
30kW
45kW
6 8 10 12
Function code
b089
0.4～55kW
Carrier frequency after
reduction (kHz)
15.0
12.0
9.0
6.0
3.0
5 10
Output current (%)
60 71 83 91
Chapter 4 Explanation of Functions
400Vclass 90kW
110kW
100
95
90
85
80
75
70
65
132kW,160kW
60
55
50
0.5 1 2 4
Carrier frequency (kHz)
Range of data
00/01 00: invalid, 01: valid
Carrier frequency reduction start level
(Restoration level)
Less than 60% of rated current
60% (55%) of rated current
71% (66%) of rated current
83% (78%) of rated current
91% (86%) of rated current
90 to 160kW
Carrier frequency
6.0kH
5.0kH
4.0kH
3.0kH
2.5kH
0
4 - 45
45kW
11-18.5kW
22kW
55kW
37kW
30kW
75kW
6 8 10 12
Related code
b089: Automatic carrier frequency
reduction selection
b083: Carrier frequency setting
Description
75～132kW
Carrier frequency after
reduction (kHz)
10.0
8.0
6.0
4.5
3.0
5 10
60 71 83 91 Output current (%)