1. Warning: Be sure to ground the power supply properly

These power supplies are categorized in safety class 1 product. To ensure operator safety, be sure to properly connect the ground (earth) terminal to ground.

2. Warning: Electrical shock hazards

These power supplies are designed to be built into an instrument or apparatus. To avoid electrical shock hazards, do not install the power supply with AC input connected to AC power line. Allow the power supply to be fully discharged before initiating installation. 

3. Caution: Do not short output cables or terminals

Do not short the output cables or terminals of the power supply. If shorted, charged capacitors inside the unit will quickly discharge and will cause fire hazards or serious potential accident by spark or overheat.  It will also damage the power supply circuitry inside. 

4. Caution: Do not repeat turning on and off in a short term

Do not repeat turning on and off the power supply in a short term to avoid causing excessive thermal stress to the surge current limiter in smoothing capacitor circuit. If repeatedly turned on and off, the input surge current limiter (a fused resistor) will blow, resulting in power supply failure. 
Note: Be sure to take the specified wait time before turning on the power supply after it was turned off. If the wait time is too short, the surge current limiter will not work and harmful surge current will cause damage to contacts of power switch or power supply failure.  

5. Low frequency noise at power on/off

A low frequency noise may be generated when the power supply is turned on or started with PS-ON signal. This noise is caused by the mechanical vibration of choke coil in harmonic current reduction circuit. A low level noise during AC operation or stand-by mode of operation is also caused by the line frequency vibration of the choke coil or another component. Neither noise does not affect the performance characteristics and operating life of power supply.

6. Method to move or carry the power supply

Do not hang the power supply by holding its output cables.  Hold the power supply unit when moving or carrying the power supply.