Chapter 7 Explanation of Functions
7 - 11
7.2.9 Maximum frequency setting
The maximum frequency setting function allows you to set the
maximum frequency of the motor driven by the inverter.
The maximum frequency set here corresponds to the maximum level
of each external analog input (for example, 10 V of the input of 0 to 10
V).
To switch the maximum frequency among the 1st and 2nd settings,
assign function "08" (SET) to intelligent input terminals. Use the SET
signal for switching.
The inverter output voltage with the frequency ranging from the base
frequency to the maximum frequency is that selected by the AVR
voltage select function (A082/A282).
Item
Function code
Range of data
Description
Maximum frequency
setting
A004/A204
base frequency 1st/2nd
motors to 400. (Hz)
The maximum output frequency is set.
7.2.10 Carrier frequency setting
The carrier frequency setting function (b083) allows you to change the carrier frequency of the PWM
waveform output from the inverter.
Increasing the carrier frequency can lower the metallic noise from the motor, but may increase the inverter
noise and current leakage.
You can use this function effectively to avoid resonance of the mechanical system and motor.
Item
Function code
Range of data
Description
Carrier frequency
setting
b083
2.0 to 15.0 (kHz)
Note: When increasing the carrier frequency (fc), derate the output current as shown in the section 12.3.
Output
voltage
AVR
voltage
select
(100%)
Base
frequency
Maximum
frequency
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