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Chapter 3 Front-Panel Operation
Programming Overcurrent Protection
47
3
5 Exit the OCP menu.
The “CHANGED” message is displayed for a second to show that the new OCP
trip level is now in effect. If the OCP settings are not changed, “NO CHANGE”
will be displayed. The power supply will exit the OCP menu and the display
will return to the meter mode. Check that the
OCP annunciator turns on.
Checking OCP Operation
To check OCP operation, raise the output current to near the trip point. Then
very gradually increase the output by turning the knob until the OCP circuit
trips. This will cause the power supply’s output current to drop to zero and the
OCP annunciator to blink. The “OCP TRIPPED” message also appears on the
display.
Clearing the Overcurrent Condition
When the OCP condition occurs (the “OCP TRIPPED” message is shown on
the display), the OCP annunciator blinks. When it was caused by external
voltage sources such as a battery, disconnect it first. Clear the overcurrent
condition by adjusting output current level or by adjusting OCP trip level.
The following steps show how to clear the overcurrent condition and get back
to normal mode operation. In the following steps, the display will go back to
“OCP TRIPPED” if you let the display time out after about several seconds.
• Adjust output current level
1 Lower the output current level.
Press key and set the knob for current control by pressing key,
then lower the output current level below the OCP trip point.
2 Move to the clear mode.
Press key twice to move to the OCP CLEAR mode. The “OCP ON”
message appears on the display. Turn the knob to the right until the above
message appears on the display.
CHANGED
OCP
OCPOCP
OCP CLEAR
Over
Current
Display
Limit
Display
Limit
Voltage
Current
Over
Current
Over
Current