Carrier Frequency; Automatic Carrier Frequency Reduction - Hitachi WJ200 Instruction Manual

CARRIER FREQUENCY

The carrier frequency is adjustable from 2.0kHz to 15kHz. The audible sound decreases at the higher frequencies, but RFI noise and
leakage current may be increased. It is recommended that the carrier frequency is 2.3kHz or greater when operating in sensorless
vector A044 = 03.
Function
Carrier Frequency

AUTOMATIC CARRIER FREQUENCY REDUCTION

The automatic carrier frequency reduction 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).
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 decreases to 5% lower than each
reduction start level.
The rate of carrier frequency reduction is 2kHz 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 freq. has been specified for
b083, this function is disabled regardless of the setting of b089.
Function
Automatic Carrier Frequency Reduction
Parameters
b083
Parameters
01 = Enabled, depending on the output current
b089
Value
2.0 – 15.0 kHz
Value
00 = Disabled
02 = Enabled, depending on the heat-sink
temperature
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