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Chapter 4 Explanation of Functions
4 - 11
4.2.9 Base frequency setting
(1) Base frequency and motor voltage
- With the base frequency setting and AVR voltage select
functions, adjust the inverter outputs (frequency and voltage)
to the motor ratings.
- The base frequency is the nominal frequency of the motor.
Set a base frequency that meets the motor specification.
Carefully note that setting the base frequency to less than
50 Hz may result in motor burnout.
- A special motor requires a base frequency of 60 Hz or
more. Your inverter model may not be suitable for such a
special motor, and one with a larger capacity may be
required.
- Select the motor voltage that meets the motor specification.
Selecting a motor voltage exceeding the motor specification
may result in motor burnout.
- To switch the base frequency among the 1st, 2nd, and 3rd settings, assign function "08" (SET) and "17"
(SET3) to intelligent input terminals (see Section 4.2.38). Use the SET and SET3 signals for switching.
Item Function code Range of data Description
Base frequency
setting
A003/A203/
A303
30. to maximum frequency,
1st/2nd/3rd motors (Hz)
200/215/220/230/240 Selectable on 200 V class inverter models
AVR voltage select A082
380/400/415/440/460/480 Selectable on 400 V class inverter models
(2) AVR function
The AVR function maintains the correct voltage output to the motor, even when the voltage input to the
inverter fluctuates. The output voltage maintained by this function is based on the voltage specified by the
AVR voltage select.
Use the AVR function select (A081) to enable or disable the AVR function.
Item Function code Data Description
00 The AVR function is always enabled.
01 The AVR function is always disabled.
AVR function select A081
02 The AVR function is disabled at deceleration. (*1)
*1 Disabling the AVR function at motor deceleration increases the energy loss on the decelerated motor
and decreases the energy regenerated on the inverter, which results in a shorter deceleration time.
4.2.10 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 (See Section 4.2.12) (for example, 10 V
of the input of 0 to 10 V).
To switch the maximum frequency among the 1st, 2nd, and 3rd
settings, assign function "08" (SET) and "17" (SET3) to intelligent
input terminals. Use the SET and SET3 signals 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).
Item Function code Range of data Description
Maximum frequency
setting
A004/A204/
A304
30. to 400. (Hz) The maximum output frequency is set.
Base frequency
Output frequency
(Hz)
A003/A203/A303: Base frequency setting,
1st/2nd/3rd motors
A081: AVR function select
A082: AVR volta
g
e select
Related code
Output
voltage
AVR voltage
select
A004/A204/A304: Maximum frequency
setting, 1st/2nd/3rd motors
Related code
Output
voltage
AVR
voltage
select
(100%)
Base
frequency
Maximum
frequency
(100%)