Chapter 3 Front-Panel Operation and Features
Programming Overvoltage Protection
51
3
Checking OVP Operation
To check OVP operation, raise the output voltage to near the trip point. Then
very gradually increase the output by turning the knob until the OVP circuit
trips. This will cause the power supply output to drop to near zero, the
OVP
annunciator to flash, and the
CC annunciator to turn on. The “
OVP TRIPPED
”
message also appears on the display.
Clearing the Overvoltage Condition
When the OVP condition occurs, the OVP annunciator flashes. When it was
caused by an external voltage source such as a battery, disconnect it first. Clear
the overvoltage condition by adjusting output voltage level or by adjusting OVP
trip level.
The following steps show you how to clear the overvoltage condition and get
back to normal mode operation. In the following steps, the display will go back
to “
OVP TRIPPED
” if you let the display time out after about several seconds.
1 Lower the output voltage level below the OVP trip point.
The
OVP and Limit annunciators are flashing after key is pressed.
2 Check that you lowered the voltage level below the OVP trip point.
The OVP trip point is displayed. Do not adjust the trip point at this step.
3 Select the OVP CLEAR mode by turning the knob.
4 Clear the overvoltage condition and exit this menu.
The
OVP annunciator will not flash any more. The output will return to meter
mode.
By Adjusting output voltage level
OVP
OVPOVP
OVP ON
ONON
ON
OVP
OVPOVP
OVP CLEAR
done
donedone
done
Display
Limit
Display
Limit
Over
Voltage
Over
Voltage
Over
Voltage
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