TDK-Lambda CUS350M Guide D'installation page 21

8. Before concluding that the unit is at fault
(1) Check if the rated input voltage is connected.
(2) Check if the wiring of input and output is correct.
(3) Check if the wire thickness is enough.
(4) Check if the output current and output wattage dose not over specification.
(5) Check if the output voltage control (Vadj) is properly adjusted. OVP might be triggered and output is shut down.
(6) Check if the Remote ON/OFF control circuit is connected correctly.
(7) Check if OTP is triggered. Please re-input to cool down the unit sufficiently.
(8) Audible noise can be heard when input voltage waveform is not sinusoidal wave.
(9) Audible noise can be heard during Dynamic-Load operation.
9. Altitude
CUS350M is safety approved for operation at below altitude.
-Up to 5000m by IEC60950-1 clearance requirement.
-Up to 4000m by IEC60601-1 clearance requirement.
Thermal evaluation should be considered for products operating at elevated altitudes above 2000m.
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TDK-Lambda
CUS350M
Instruction Manual