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Clearing the OVP Condition
With the OVP tripped, return to the meter mode and try to clear the condition by pressing
to happen because the CV trip point is still below the programmed output voltage. Thus, as soon as the circuit is cleared, it
trips again. You can clear the OV condition by:
•
lowering the output voltage below 11.5 (the OV setting),
•
or by raising the OV trip voltage above the output voltage setting.
Try either of these methods. Now when you press
return to normal.
Note
In Series 654XA and 655XA supplies, the OVP circuit shorts the power supply output through an SCR. If
the load maintains current through the SCR, the above methods will not clear an OVP trip condition. You
must first remove the external current source before attempting to clear OVP.
Programming Overcurrent Protection
When enabled, overcurrent protection removes the power supply output whenever it goes into CC operation. This prevents
the supply from indefinitely supplying the full programmed current to the load.
Setting the OCP Protection
To activate overcurrent protection, press
operate normally until it is forced into CC operation. If that occurs, the power supply will remove its output.
Checking OCP Operation
The easiest way to check this operation at any specified current is to place a short across the output. If the supply is
connected to an Agilent Electronic Load, press its key. The power supply output will then drop to zero and the Prot
annunciator will come on.
There is now no power supply output due to an overcurrent condition. To verify this, press
display indicates 0C.
Clearing the OCP Condition
With the OCP tripped, return to the meter mode and try to clear the condition by pressing
to happen because the reason for the condition has not been removed. Thus, as soon as the circuit is cleared, it trips again.
You can clear the OC condition by:
•
increasing the load resistance to lower the output current below the programmed current value,
•
or by raising the programmed current to a value above that required by the load.
In this example, the easiest way to clear the OCP fault is by removing the short from across the output. After doing this, you
clear the OVP circuit by pressing
restored to normal.
If desired, you can also restore the output by disabling the OCP function (press
This restores the output but does not clear any condition that may have caused OCP to trip.
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, the Prot annunciator will go off and the output voltage will
. The OCP annunciator will come on and power supply will continue to
. The Prot annunciator will go off and the power supply output will be
. Nothing will appear
and observe that the
. Nothing will appear
to turn off the OCP annunciator.
Front Panel Operation 59
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