3
Operating the Power Supply Locally
42
Series N5700 User’s Guide
Output On/Off Controls
The Output On/Off controls turn the power supply output on or off. This
can be done with the front panel OUT ON button or from the rear panel
J1 connector. With the output off, adjustments can be made to the power
supply or the load without shutting off AC power.
OUT ON button
The OUT ON button can be pressed at any time to enable or disable the
power supply output. When the output is disabled, the output voltage and
current go to zero and the display shows OFF.
Safe-Start and Auto-Restart
The power supply can be programmed to have either the last operating
settings (Auto-Restart) or the reset settings (Safe-Start) apply at turn-on.
Press and hold the OUT ON button to select between Safe-Start and Auto-
Restart modes. The display continuously cycles between SAF and AUT
every three seconds. Releasing the OUT ON button while one of the
modes is displayed, selects that mode.
In Safe-Start mode
, the power supply turns on with the reset settings
(see chapter 5 under “*RST”). The output is disabled and the output
voltage and current are zero. This is the factory default.
CAUTION
After the “OFF” is first displayed, you need to allow a few seconds for the unit to
stabilize before you enable the output with the OUT ON button. The output
voltage and current settings may not be at zero during this stabilization time.
Check that the settings are stable by pressing the LIMIT button and verifying that
the voltage and current settings indicate zero.
In Auto-Restart mode
, the power supply restores the operating settings
that were saved when it was last turned off (see below). The output is
either enabled or disabled according to its last setting.
Output On/Off state
UVL level
Output voltage setting
OCP setting
Output current setting
Locked/Unlocked front panel
OVP level
Start-up mode
Output Shut-Off Terminals
Output Shut-Off (SO) terminals are available on the J1 connector to
enable or disable the power supply output.
This function is edge-
triggered.
J1 pin 15 is the Shut-Off input, and pins 2 and 3, which are
connected internally, are the signal common. All pins are optically
isolated from the power supply output. The Shut-Off input accepts a 2.5V-
to-15V signal or an open/short contact to enable or disable the output.
The Shut-Off control logic is selected by SW1 setup switch 5.
