COSEL CO.,LTD. : Troubleshooting Tips

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2. In case of Abnormal Output Voltage(Too High, Too Low, Unstable) - what to check

When output voltage is too low.
Check Points	Solutions	Applicable Products
Input voltage is too low. - 1 Is input voltage lower than the minimum specified?	Measure the input voltage.	All Series
Input voltage is too low. - 2 Is wave form of input voltage distorted?	If distorted, use AVR for input.	All Series
Output voltage is set too low. Is output voltage adjuster (trim pot) turned excessively counterclockwise?	Turn output voltage adjuster clockwise.	All Series
There is a voltage drop caused by output wires. - 1 Is voltage drop caused by long output wires to the load?	Make the output wires shorter.	All Series
There is a voltage drop caused by output wires. - 2 Is voltage drop caused by thin (high-AWG) output wires to the load?	Use thicker (low-AWG) wires.
There is a voltage drop caused by output wires. - 3 Is there any bad connection?	Check the connection.
There is a voltage drop caused by output wires. - 4 Have the terminal screws loosened?	Tighten the screws.
Overcurrent protection has been operated. Are there any chances that the drawing current has become greater than the rated output current?	Check the rated output current of the power supply used and measure the current actually drawn from power supply.	All Series

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