Chapter 3 Front-Panel Operation
Programming Overvoltage Protection
30
Programming Overvoltage Protection
Overvoltage protection guards the load against output voltages that reach a
specified value greater than the programmed protection level. It is
accomplished by shorting the output v ia an internal SCR when the t rip le vel is
set to equal or greater than 3 volts, or by progamming the output to 1 volt when
the trip level is set to less than 3 volts.
The following steps show how to set the OVP trip level, how to check OVP
operation, and how to clear overvoltage condition.
• Front-panel operation:
Setting the OVP Level and Enable the OVP Circuit
1 Turn on the power supply.
The power supply will go into the
power-on / reset
state; the output is disa bled
(the
OFF
annunciator turns on); the 8V/20A* or 25V/7A** range is select ed (the
8V
* or
25V
** annunciator turns on); and the knob is selected for
voltage
control.
2 Enable the output.
The
OFF
annunciator turns off and the display will go to the meter mode.
3 Enter the OVP men u and set the trip level.
You will see the above message on the display when you enter the OVP menu.
Adjust the control knob for the desired OVP trip level.
Note that you cann ot set the trip level s to lower than 1.0 volt.
4 Enable the OVP circuit.
You will see the above mess age after pressing key.
LEVEL 22.0V (E3633A)
LEVEL 55.0V (E3634A)
OVP ON
Power
Output
On/Off
Over
Voltage
Over
Voltage
Over
Voltage
*For HP E3633A Model **For HP E3634A Model
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