5.4 UNDER VOLTAGE LIMIT (UVL)
The UVL prevents adjustment of the output voltage below a certain limit. The combination of U
OVP functions, allow the user to create a protection window for sensitive load circuitry.
Setting the UVL can be made when the power supply output is Enabled (On) or Disabled (Off). To set the UVL
level, press the OVP/UVL butto
n TWICE, so that the CURRENT meter shows “UUL”. The VOLTAGE meter shows
the UVL setting level. Rotate the VOLTAGE encoder knob to adjust the UVL level. The display will show ‘UUL” and
the setting value for 5 seconds after the adjustment has been completed
and then will return to its pr
UVL setting values are limited at the maximum level to approximately 5% below the Output Voltage setting. A
tempting to adjust the UVL above this limit will result in no response to the adjus
Foldback protection will shut down the power supply output if the load current exceeds the current limit setting
level. This protection is useful when the load circuitry is sensitive to an over current condit
Setting the Foldback protection
To arm the Foldback protection, the FOLD button should be pressed so that the FOLD LED illum
tion, transition from Constant Voltage to Constant Current mode will activate the
ivation of the Foldback protection disables the power supply output, causes the
ALARM LED to blink and displays “Fb” on the VOLTAGE meter.
Resetting activated Foldback protection
There are four methods to reset an activated Foldback protection.
OUT button. The power supply output is enabled and the Output Voltage and cu
their last setting. In this method, the Foldback protection remains armed; therefore if the load current is higher
than the current limit setting, the Foldback
protection will be activated again.
Press the FOLD button to cancel the Foldback protection. The power supply output will be di
VOLTAGE display will show “OFF”. Press the OUT button to enable the power supply output.
tput Off and then On using the SO control (refer to Section 5.7). In this method the
foldback protection remains armed, therefore if the load current is higher than the current limit setting the Fol
back protection will be activated.
Off using the switch, wait until the front panel display turns Off, then turn the unit back
ON again. The power supply output is enabled and the Output Voltage and Current will return to their last se
ting. In this method, the Foldback protection remains a
rmed; therefore if the load current is higher than the
current limit setting, the Foldback prote
5.6 OUTPUT ON/OFF CONTROL
The Output On/Off enables or disables the power supply output. Use this function to make adjus
the power supply or the load without shutting off the ON/OFF switch. The Output On/Off can be activated from the
front panel using the OUT button or from the rear panel J1 connector. The OUT button can be pressed at any time
e power supply output. When the output is disabled, the output voltage and current fall to
zero and the VOLTAGE display shows “OFF”.
OFF (SO) CONTROL VIA REAR PANEL J1 CONNECTOR
Contacts 2, 3 and 15 of J1 (Fig.4
2, Item 5) serve as Output S
Off (SO) terminals. The SO terminals accept a
2.5V to 15V signal or Open
Short contact to disable or enable the power supply output. The SO function will be
vated only when a transition from On to Off is detected after applying AC power to unit. (T
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 a
d to J1. This function is useful for connecting power supplies in a “Daisy
chain” (refer to Section 5.16). The SO
control can be used also to reset the OVP and Fold Protection. Refer to Section 5.3 and 5.5 for d
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