Hitachi SJ300 Series Wiring Examples, Voltage Input, Current Input, Bipolar Voltage Input

4–61

SJ300 Inverter

The examples below show how the use of the [AT] input during operation enables/disables the Trim Frequency Command input [O2]—[L]. The [O2]—[L] input may be used alone, or as an offset control for the primary analog input.

Example 1: Without reverse

Example 2: With reverse

[FW] terminal

[AT] terminal

External frequency

FOI

External frequency

FOI

command

[O/OI] terminal 0

Trim frequency

FO2

Trim frequency

FO2

command

[O2] terminal

Actual frequency 0

forward

command

reverse

FO + FO2

FOI + FO2

FO + FO2

FOI + FO2

Wiring Examples 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 to 2kΩ, 2 Watts.

H O2 AM FM

L O OI AMI

		1 to 2 kΩ, 2W



L
	H
	H

Operations Monitoring and

Voltage Input – The 0–10V voltage input circuit uses terminals [L] and [O]. Attach the signal cable’s shield wire to terminal [L] on the inverter only. DO NOT ground the shield at its other end. Maintain the voltage within specifications (do not apply negative voltage). Normally a full-span input level (10V) will give the maximum motor frequency. You can use parameter A014 to select a lower voltage for full output frequency (such as using a 5V input signal).

Bipolar Voltage Input – The -10 / 0 / +10V voltage input circuit uses terminals [L] and [O2]. Attach the cable’s shield wire to terminal [L] on the inverter only. Maintain the voltage within specifications. Only apply a negative voltage if this input is configured for bipolar use.

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’s shield wire to terminal [L] on the inverter only.

Standard Voltage Input

Bipolar Voltage Input

Current Input

AMI

+–

0 to 9.6 VDC,

-10 to 9.6 VDC,

4 to 19.6 mA DC,

0 to 10V nominal

4 to 20 mA nominal

See I/O specs on page 4–9.