Series 2268 850 Watt DC Power Supplies Reference Manual
Local Operation
2268S-901-01 Rev. A / January 2015
49
SETTING FOLDBACK MODE
Foldback mode is used to disable the output when a transition is made between the operating
modes. The power supply will turn off/disable the output and lock in foldback mode after a
specified delay if the power supply transitions into CV mode or into CC mode, depending on
the foldback mode settings. This feature is particularly useful for protecting current or
voltage sensitive loads. Foldback can be set to trigger a switch when transitioning from CV to
CC mode or from CC to CV mode.
To set the foldback protection and foldback delay time:
1.
Turn the 9-position mode control to the FLD position or press the rotary
Adjust/Enter control if the 9-position mode control is already at the FLD position.
2.
Select the type of crossover that will cause foldback to trigger by using the rotary
Adjust/Enter control.
If the mode selected is CC or CV mode, the foldback delay timer will start on a
transition into the selected mode. If the mode selected is none, foldback is not enabled.
3.
Press the rotary Adjust/Enter control when the desired mode has been selected.
The FLD LED will illuminate and
will be displayed in the output voltage display.
4.
Adjust the desired delay time using the rotary Adjust/Enter control.
The range can be set from 0.50 seconds to a maximum of 50 seconds. The step size is in
increments of 0.05 seconds when setting from 0.50 to 5 seconds and then in 1 second
increments from 5 seconds to 50 seconds.
5.
Once the desired foldback delay time has been selected, press the rotary
Adjust/Enter control to commit the foldback delay setting.
To disable foldback protection:
1.
Turn the 9-position mode control to the FLD position or press the rotary
Adjust/Enter control if the control knob is already at the FLD position.
2.
is displayed on the output voltage display and the output current display
shows the current foldback trigger mode.
3.
Turn the rotary Adjust/Enter control until
is displayed in the output current
display.
4.
Press the rotary Adjust/Enter control to commit the setting once the desired value
has been set.
5.
The green FLD LED will turn off and the display will return to the normal display
mode.
The SCPI command (s) for these instructions are:
[:]OUTPut[<channel>]:PROTection:FOLDback[:MODE]
[:]OUTPut[<channel>]:PROTection:FOLDback:LATCh
Important:
If you set foldback while the output is enabled and the trigger you
select is the same as the current operating mode, the foldback timer will begin
counting immediately after the delay time has been set.
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