Operating the Power Supply Locally
3
Series N5700 User’s Guide
43
When an on-to-off transition is detected at the Shut-Off input, the Shut-
Off function enables or disables the output according to the signal level
or the open/short applied to J1 pin 15. When the output has been
disabled by the Shut-Off function, the display shows SO to indicate the
output is disabled.
To re-enable the output after it has shut down, you must disable the Shut-
Off signal. In Auto-Restart mode, operation resumes automatically. In
Safe-Start mode the Shut-Off function is latched. You must also press the
OUT ON button or send an OUTPut:PROTection:CLEar command to
resume operation.
The Shut-Off function can be used to shut down multiple power supplies
in a daisy-chain fashion as explained later in this chapter. It can also be
used to reset the OVP and OCP as previously described.
SW1 switch 5
SO Signal Level
Output
Display
Down (default)
2 - 15 V or Open
On
Voltage/Current
0 – 0.4V or Short
Off
SO
Up
2 - 15 V or Open
Off
SO
0 – 0.4V or Short
On
Voltage/Current
NOTE
Because this function is edge-triggered, it may not be triggered by every state
change. For example, after applying AC power, the output will not be disabled
by the Shut Off function if the Shut-Off input is in the shut-off state. This is
because the unit has not detected an on-to-off signal transition.
Enable/Disable Terminals
CAUTION
To prevent possible damage to the unit, do not connect the or Enable –
terminals to the positive or negative output terminals.
Enable/Disable terminals are available on the J1 connector to enable or
disable the power supply output.
This function is level-triggered.
Simply
connect a switch or relay between J1 pins 1 and 14. This function is
activated by SW1 setup switch 9.
These pins disable the output when they are opened. When the output is
disabled, the PROT indicator on the front panel will blink.
To re-enable the output after it has shut down, you must short the Enable
+ and Enable – terminals. In Auto-Restart mode, operation resumes
automatically. In Safe-Start mode the Enable/Disable function is latched.
You must also press the OUT ON button or send an
OUTPut:PROTection:CLEar command to resume operation.
SW1 switch 9
ENA+/ENA– pins
Output
Display
Prot Indicator
Down (default)
Not active
On
Voltage/Current
Off
Up
Opened
Off
ENA
Blinking
Shorted
On
Voltage/Current
Off
