7 Detailed Functions
7 - 100
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• Use this function to reduce the carrier frequency automatically as the output current increases.
• To enable this function, set the Automatic Carrier Reduction (b089) to 01 (Enable).
• When the output current exceeds 60%, 72%, 84%, and 96% of the rated current, this function
reduces the carrier frequency to 12, 9, 6, and 3 kHz, respectively.
The normal carrier frequency will be restored when the output current exceeds the carrier reduction
start level –5% (Reset level).
(Example 3) Frequency pull-in restart (b088 = 02)
• When the set Restart Standby Time (b003) elapses,
the inverter starts to output at the frequency set in
the Starting Frequency Selection at Frequency
Pull-in Restart (b030).
• Then, the inverter decelerates the motor according
to the Frequency Pull-in Restart Parameter (b029)
setting, while suppressing the output current to the
value set in the Frequency Pull-in Restart Level
(b028).
• When the current decreases to or below the
Frequency Pull-in Restart Level (b028), the inverter
accelerates the motor again to return to the original
frequency.
• If this method causes an overcurrent trip, decrease
the value set in the Frequency Pull-in Restart Level
(b028).
Automatic Carrier Frequency Reduction Function
Parameter No. Function name Data Default data Unit
b089
Automatic Carrier
Reduction
00: Disabled
01: Enabled, dependent on the current
00 –
Carrier reduction start level (Reset level) Reduced carrier frequency (kHz)
Less than 60% of rated current 15.0
60% (55%) of rated current 12.0
72% (67%) of rated current 9.0
84% (79%) of rated current 6.0
96% (91%) of rated current 3.0
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