Hitachi SJ700D-004L, Instruction Manual

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Chapter 4 Explanation of Functions
4-44
- VT mode
(NOTE) In case of replacing with SJ300 combined with LCR filter, please check the type code of LCR filter and consult for
compatibility (75-150kW).
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 the current level described below, this function reduces the carrier frequency,
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)
0.4 to 55kW(CT mode)
75 to 150kW(CT mode)
0.4 to 55kW(VT mode)
75 to 150kW(VT mode)
Carrier frequency after reduction (kHz)
Less than 60% of rated current 15.0 10.0 6.0
60% (55%) of rated current 12.0 8.0 5.0
72% (67%) of rated current 9.0 6.0 4.0
84% (79%) of rated current 6.0 4.5 3.0
96% (91%) of rated current 3.0 3.0 2.5
(Example) 0.4 to 55kW(CT mode)
- 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.
15.0kHz
60%
Output current (%)
Carrier frequency
12.0kHz
9.0kHz
6.0kHz
3.0kHz
72% 84% 96%
0 100 50
b089: Automatic carrier frequency
reduction selection
b083: Carrier frequency setting
Related code
Carrier frequency (kHz)
D
er
at
ing
o
f
o
ut
pu
t
cur
re
n
t
60
%
55
%
100
%
95
%
90
%
85
%
80
%
75
%
70
%
65
%
3.7,18.5kW
37kW
200V class
0.5 2 4 6 8 10 12
15,45kW
55kW
30kW
22kW
11kW
400V class
Carrier frequency (kHz)
D
er
at
ing
o
f
o
ut
pu
t
cur
re
n
t
60
%
55
%
100
%
95
%
90
%
85
%
80
%
75
%
70
%
65
%
75kW
55kW
0.5 2 4 6 8 10 12
45kW
132kW
30kW
110kW
3.7kW
90kW
22kW
37kW
18.5kW