Power Supply Operation
3-5
3.4
Setting the Overvoltage Protection
The overvoltage protection is designed to prevent the load from output voltages that reach a
specified value greater than the defined protection value. To accomplish the OVP, the output
is shorted via an internal SCR when the trip level is set greater than 3V or by programming the
output to 1V when the trip level is set to less than 3V.
The following procedures show how to set the OVP trip level, how to check OVP operation,
and how to clear overvoltage condition.
To set the OVP level and enable the OVP circuit via the Front Panel
1. Turn on the power supply:
When the power supply turns on, it goes into a disabled
output state.
2. Get into the OVP menu and set a desired trip level:
Press the
OVP
key. You will see
LEVEL 39.60V/66V
on the 62010L-36-7/62015L-60-6 display. Press the
or
buttons
to move the cursor and adjust the control knob for a desired OVP trip level. The trip levels
can be set within 0V to 39.6V/66V.
3. Enable the OVP circuit:
Press
OVP
key again. The OVP with the blinking
ON
symbols
shows on the display. Press the same button once again to finish. The power supply will
exit the OVP menu and the display will return to the meter mode. Then you will see the
OVP lit at the bottom of the display.
4. Exit the OVP menu without saving:
Before applying the above procedure, you can
press any other key to exit from the present OVP settings, which will not be saved in the
non-volatile memory.
Inspecting the OVP settings via the Front Panel
To inspect OVP operation, increase the output voltage to near the trip point. Then raise the
output by rotating the knob until the OVP circuit trips. This operation will cause the power
supply output to drop to zero, the
OVP
on the display will blink, and the
CV
symbol will light.
The
OVP TRIP
message is displayed immediately.
Clearing the overvoltage condition via the Front Panel
If the OVP Trip symbol appears, and this condition is caused by an external voltage source
like a battery, disconnect the source first. The following procedures show you how to clear the
overvoltage condition and revert to the normal mode operation.
1. Set the OVP trip level:
Press the
OVP
button and raise the OVP trip level with the knob
so that the trip level’s value is higher than the output level. To review the output voltage
value, you can press the
Limit
button.
2. Move to the clear mode:
Press the
OVP
button. The OVP symbol will blink
ON
.
3. Clear OVP and exit the settings:
Rotate the knob clockwise in order to see the blinking
CLEAR symbol
. Press the
OVP
button again to clear the previous memorized OVP value.
The output will return to the meter mode.
Remote Operation:
VOLT:PROT {<voltage>|MIN|MAX}
Set the OVP level.
VOLT:PROT:STAT {OFF|ON}
Disable or enable the OVP circuit.
VOLT:PROT:CLE
Clear the tripped OVP circuit.
Note
The OVP circuit contains a crowbar SCR, which efficiently shorts the output of
