Troubleshooting - Extech Instruments DPC42 User Manual

11. Troubleshooting
OUP: Over Voltage Protection
This unit has a built‐in tracking over voltage protection feature. In the event of output voltage
becoming greater than the set value (see specified range from specifications table), protection
will be triggered and the output power will be cut off and OUP warning appears as below.
To reset the warning, switch off the unit and remove all loading.
Switch the unit back on again and it should resume normal operation.
If this problem persists, please contact the customer care department or the point of purchase.
OTP: Over Temperature Protection
There is a thermo sensor inside the unit to monitor and prevent the unit from unduly heating
internally. When an OTP error occurs, there is no output and the following warning will appear
on the LED display.
When this warning appears, switch off the unit and remove all loading.
Check the load and output setting. Allow the unit to cool for at least 30 minutes.
Check to see if any ventilation holes are blocked, also check that there is sufficient clearance
around the power supply.
Listen carefully for the short wind sound emanating from the cooling fan when the unit is
switched ON again. If the wind sound is not detected, the fan may be faulty; do not use the
power supply in this case, contact the customer care department or the agent from the point of
purchase.
OCP: Over Current Protection
Normally the overload protection is sustained by the CC constant current mode. When the CC
mode fails and goes undetected, serious damage to the test piece or load may occur. The OCP is
used to minimize the extent of damage to the loads in the event of power supply failure.
Switch off the power supply as soon as this warning is seen (as shown below).
To reset this warning, remove all loading and press the OUTPUT ON/OFF button.
Switch the unit back on again and double check with caution.
If this problem persists, please contact the customer care department or consult with the agent
at the point of purchase.
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