5-5 Settings Relating to Control Method
Automatic Carrier Frequency Reduction Function
This function automatically reduces carrier frequency according to an increase in output current.
This function is enabled when Automatic Carrier Reduction (b089) is set to "01: Enabled."
Parameter
No.
Function name Data
Default setting
Unit
b089
Automatic Carrier
Reduction
00: Disabled
01: Enabled/depends on current
02: Enabled/depends on fin temperature b083
00 −
Related functions
When the output current exceeds 60%, 72%, 84% or 96% of the rated current, the carrier frequency is reduced to 12, 9, 6 or 3 kHz, respectively. When the output current falls below -
5% of each level, this function will be reset.
Starting level of carrier frequency reduction
(Recovery level)
Less than 60% of the rated current
60% (55%) of the rated current
72% (67%) of the rated current
84% (79%) of the rated current
96% (91%) of the rated current
When b089 set to 01
Carrier frequency
15.0 kHz
Reduced carrier frequency [kHz]
15.0
12.0
9.0
6.0
3.0
12.0 kHz
9.0 kHz
6.0 kHz
3.0 kHz
5
Output current (%)
0 50 100
60 % 72 % 84 % 96 %
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5-52
5
5-5 Settings Relating to Control Method
When b089 set to 02
Carrier frequency
15.0kHz
12.0kHz
9.0kHz
6.0kHz
3.0kHz
0
40 50 60 70 80
Fin temperature (
°C)
The carrier frequency reduction rate is 2 kHz per second.
The upper limit of Carrier Frequency (b083) variable with this function conforms to the set value of carrier frequency b083, and the lower limit is 3 kHz.
If b083 is 3 kHz or below, this function is disabled regardless of the setting of b089.
5-53
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
