Hitachi SJ700-4000HFU2

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)
AVR voltage select
A082
200/215/220/230/240
Selectable on 200 V class inverter models
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
AVR function select
A081
00
The AVR function is always enabled.
01
The AVR function is always disabled.
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 voltage 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%)