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System-Related Functions

The related configuration menus can be displayed only when the user se-

lects the analog interface.

3. Rotate the knob, select Ext_Program, and press [Enter] key for

confirmation.

4. Rotate the knob, and switch the display of On and Off options. After select-

ing On , press [Enter] key for confirmation.

• Off: Default value, indicating that this function is turned off.

• On: Indicating that the function is turned on. Before turning on the exter-

nal analog interface function, please confirm whether pins 1 (Vol_Pro),

15 (Cur_Pro) and 17 (Cur/Vol_Pro) are correctly connected.

5. Press [Esc] key, and exit the menu interface.

Analog interface remote control

Through the analog input interface, the analog signal can be input to remotely

set the outputvoltage value or current value. For detailed function definition of

pin, refer to Table 7–2 DB25 analog interface description. The text below intro-

duces the wiring and usage method taking the common On/Off control and volt-

age and current control as examples.

When the voltage and current setting values are controlled through the analog

interface, connect the external voltage (0V ~ 10V) to program the voltage or cur-

rent value between 0 and full range. Meanwhile, the analog monitoring function

(0V ~ 10V) can be used to monitor the existing voltage or current between 0

and full range. During parallel operation, the master unit analog interface can be

used to program or monitor the voltage and current for programming of 0V ~

10V and monitoring of voltage or current value between 0V and parallel full

range.

For example, the analog controls the current with range of 0 ~ 80A. When the

analog signal voltage is set to 5V, the instrument’s output or input voltage is set

to 40A; when the analog signal voltage is set to 8V, the instrument’s output or in-

put voltage is set to 64A.

Voltage and current setting

• CV priority mode

– Voltage setting: Connect an external DC power supply capable of output-

ting 0V ~ 10V between pin 1 (Vol_Pro) and pin 3/4/5/6 (AGND) of the

analog interface.

– Positive current limit setting (I_Lim+): Connect an external DC power

supply capable of outputting 0V ~ 10V between pin 17 (Cur/Vol_Pro) and

pin 3/4/5/6 (AGND) of the analog interface.

ITech IT-M3400 Series User Manual

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