Instructions

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5.7.1 External Shut Off Function
SO signal serves as Output Shut Off . It is an optically isolated signal from the power supply
output. Connection to the signal is made via pin J3-5 (Shut Off) and pin J3-7 (IFC_COM). The SO
pin accepts a 2.5V to 15V signal or Open-Short contact to disable or enable the power supply
output. The SO function will be activated only when a transition from On to Off is detected after
applying AC power to the unit. Thus, in Auto start mode, the output will be enabled after applying
AC power, even if SO is in Off level. After On to Off transition is detected, the SO will enable or
disable the power supply output according to the signal level or the short/open applied to J3.
When the external SO is triggered, the power supply will display ”SO”on the voltage display but
the PROT LED will not illuminate.
The external shutdown is useful when using the power supply as part of a larger test system in
which digital or analog control is required or in ”Daisy-Chain”.
The SO control logic can be selected via the Front panel as follows:
1. Press MENU button. MENU (GREEN) LED illuminates. ”set” message appears on the Voltage
display and ”r
. AN” message appears on the Current display.
2. Press Current encoder. The ”SO” message appears on the Current display.
3. Press the Current encoder again. The ”SO” message appears on the Voltage display. Parameter
”OS” or ”NEG” appears on the Current display.
4. Rotate and press the Current encoder to select the required parameter.
5. For signal details refer to Table 5-4.
SO logic SO signal level (J3-5 - J3-7) Output status
Positive (as PS_OK) (default) 2-15V or Open
0-0.6V or Short
On
Off SO
Negative 2-15V or Open
0-0.6V or Short
Off SO
On
Table 5-4: SO logic selection
5.7.2 Interlock Function - Analog On/Off. (Enable/Disable)
Interlock signal serves as Output Enable/Disable via switch or relay. Use the Interlock function to
enable or disable the output as emergency shutoff or door open switch. It is an optically isolated
signal from the power supply output. Connection to the signal is made via pin J3-4 (ILC) and pin
J3-7 (IFC_COM).
The ILC control logic can be selected via the Front panel as follows:
1. Press MENU button. MENU (GREEN) LED illuminates. ”set” message appears on the Voltage
display. ”r
. AN” message appears on Current display.
2. Press Current encoder and the ”I C ” message appears on the display.
3. Press Voltage encoder and ”I C ” message appears on the display. The parameters ”OFF” or
”ON” appear on the Current encoder display.
4. Rotate and press the Current encoder to select desired parameter.
5. For signal details refer to Table 5-5.