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3 Operating the Power Supply Locally
38 Series N5700 User’s Guide
• Press the OUT ON button to turn the output on.
• Turn the AC power off, wait a few seconds, and turn it on.
• Turn the output off, then on again using the Shut Off pin on
the J1 connector. This only applies in Auto-Restart mode.
• If the OVP continues to trip, try lowering the output voltage
below the OVP setting, or raising the OVP setting.
Under-Voltage Limit
The under-voltage limit prevents adjustment of the output voltage
below a certain limit. The combination of UVL and OVP functions let
you create a protection window for sensitive load circuitry.
Setting the UVL can be made when the output is enabled (On) or
disabled (Off). To set the UVL level, press the OVP/UVL button twice,
so that the display shows UUL. The display will show the UVL setting.
Rotate the voltage knob to adjust the UVL level. The display will show
UUL and the setting value for another five seconds and then return to
its previous state.
The UVL settings are limited at the maximum level to approximately
5% below the output voltage setting. Attempting to adjust the UVL
above this limit will result in no response to the adjustment attempt.
The minimum UVL setting is zero.
Over-Current Protection
Over-current protection will shut down the power supply output if
the load current exceeds the current limit setting. This protection is
useful when the load is sensitive to an over-current condition.
To arm the over-current protection, press the OCP/488 button so that
the OCP indicator illuminates. When armed, a transition from
constant voltage to constant current mode will activate the over-
current protection. When an over-current protection event occurs,
the output is disabled, the display shows OCP, the PROT indicator
blinks, and OC is set in the Questionable Condition status register.
Use one of the following methods to reset over-current protection
after it activates. If the load current is still higher than the current
limit setting, the over-current protection will be activated again.
• Press the OUT ON button to turn the output on.
• Turn the AC power off, wait a few seconds, and turn it on.
• Turn the output off, then on again using the Shut Off pin on
the J1 connector. This only applies in Auto-Restart mode.
• Press the OCP/488 button to cancel over-current protection.
The display will show OFF because OCP protection is latched.
Press the OUT ON button to reset OCP. With this method, the
over-current protection is disabled. If the load current is still
higher than the current limit setting, the power supply will
only attempt to limit the current at the current limit setting.