7 Detailed Functions
7 - 94
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• Set the frequency at which the inverter starts to output when the RUN signal turns ON.
• Normally, you need not adjust the Starting Frequency (b082). Decrease the default data if control
must be provided at less than 1.5 Hz.
• Setting the Starting Frequency (b082) too high may trigger the overload limit function or result in an
overcurrent.
• This function is disabled when the 1st Control Method (A044) is set to 04 (0SLV: 0-Hz sensorless
vector control) or 05 (V2: Sensor vector control).
• Set the carrier frequency at which the inverter generates a PWM output.
• Set a higher carrier frequency value to reduce the metallic sound generated by the motor.
• However, setting the carrier frequency too high may require derating (a limitation) at inverter rated
output current because of the increase in the amount of heat generation in the inverter.
For the relationship between the carrier frequency and derating, refer to Derating of Rated Output
Current on page 2-6.
• Use the following information as a guide if the carrier frequency must be adjusted.
Starting Frequency
Parameter No. Function name Data Default data Unit
b082 Starting Frequency 0.10 to 9.99
1.5
*1
*1. The default data was changed from the previous model.
Hz
Carrier Frequency
Parameter No. Function name Data
Default
data
Unit
b083
Carrier
Frequency
*1
*1. This parameter requires derating.
Heavy
load (CT)
0.5 to 15.0 (0.4 to 55 kW) 5.0
Hz
0.5 to 10.0 (75 to 132 kW) 3.0
Light load
(VT)
0.5 to 12.0 (0.4 to 55 kW) 3.0
0.5 to 8.0 (75 to 132 kW) 3.0
Carrier frequency setting Low High Explanation
Metallic sound from motor Large Small
High carrier frequencies produce a high tone sound, which
is difficult to be heard by human ears.
Electrical noise and
high-frequency leakage
current
Small Large
High carrier frequencies results in an increase in the
number of ON/OFF times, having a larger impact
accordingly.
Output torque
Slight
increase
Slight
decrease
Carrier frequency has little effect on output torque.
FW
b082
Output
frequency
Output
voltage
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