Hitachi X200 Series instruction manual 53, Analog Input Operation

4−53

Analog Input Operation

The X200 inverters provide for analog input to command the inverter frequency output value. The analog input terminal group includes the [L], [OI], [O], and [H] terminals on the control connector, which provide for Voltage [O] or Current [OI] input. All analog input signals must use the analog ground [L].

AM H O OI L

+V Ref.

Voltage input

Current input

A GND

If you use either the voltage or current analog input, you must select one of them using the logic input terminal function [AT] analog type. Refer to the table on next page showing the activation of each analog input by combination of A005 set parameter and [AT] terminal condition. The [AT] terminal function is covered in “Analog Input Current/Voltage Select” on page 4–22. Remember that you must also set A001 = 01 to select analog input as the frequency source.

V/I input	A001
select
[AT]	Freq.
	setting
AM H O OI	L

Å 4-20 mA

+ - 0-10 V

NOTE: If no logic input terminal is configured for the [AT] function, then inverter recognizes that [AT]=OFF.

Inverter and

Using an external potentiometer is a common way to control the inverter output frequency (and a good way to learn how to use the analog inputs). The potentiometer uses the built-in 10V reference [H] and the analog ground [L] for excitation, and the voltage input [O] for the signal. By default, the [AT] terminal selects the voltage input when it is OFF.

Take care to use the proper resistance for the potentiometer, which is 1~2 kΩ, 2 Watts.

AM H O OI L

1 to 2kΩ, 2W

Mounting installation

Voltage Input – The voltage input circuit uses terminals [L] and [O]. Attach the signal cable’s shield wire only to terminal [L] on the inverter. Maintain the voltage within specifications (do not apply negative voltage).

Current Input – The current input circuit uses terminals [OI] and [L]. The current comes from a sourcing type transmitter; a sinking type will not work! This means the current must flow into terminal [OI], and terminal [L] is the return back to the transmitter. The input impedance from [OI] to [L] is 250 Ohms. Attach the cable shield wire only to terminal [L] on the inverter.

	AM	H	O	OI	L
0 to 9.6 VDC,				+ -
0 to 10V nominal
	AM	H	O	OI	L
4 to 19.6 mA DC,
				Å
4 to 20mA nominal

See I/O specs on page 4-6.