Hitachi SJ700-2 instruction manual Base frequency setting, Maximum frequency setting

Chapter 4 Explanation of Functions

Related code

4.2.9 Base frequency setting

(1) Base frequency and motor voltage	A003/A203/A303: Base frequency setting,
- With the base frequency setting and AVR voltage select	1st/2nd/3rd motors
	A081: AVR function select
functions, adjust the inverter outputs (frequency and voltage)	A082: AVR voltage select

to the motor ratings.	Output
- The base frequency is the nominal frequency of the motor.
Set a base frequency that meets the motor specification.	voltage
Carefully note that setting the base frequency to less than	AVR voltage
50 Hz may result in motor burnout.	select
- A special motor requires a base frequency of 60 Hz or	(100%)
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			Output frequency
may result in motor burnout.		Base frequency	(Hz)

-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	A003/A203/	30. to maximum frequency,
setting	A303	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 Related code

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).

A004/A204/A304: Maximum frequency setting, 1st/2nd/3rd motors

Output voltage

AVR voltage select (100%)

Base Maximum frequency frequency

Item	Function code	Range of data	Description
Maximum frequency	A004/A204/	30. to 400. (Hz)	The maximum output frequency is set.
setting	A304

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