What is a maximum operating temperature?

Maximum operating temperatures apply to components/materials including those that carry, support, or contain hazardous voltage or current. As an example, a plastic enclosure has two temperature ratings, maximum surface temperature and its own maximum operating ambient air temperature.

Where is critical temperature located in AC-DC power supply?

Caution! In internal power supplies the components with critical temperature are often located on primary side of AC-DC power supply! Use appropriate safety measures as these components are at hazardous voltage levels. Only qualifi d personnel should attempt to make these measurements.

What is a common power supply voltage tolerance?

Common power supplies support wide input voltage range to cover worldwide AC mains networks. The standard defin s the supply voltage tolerance to be +6% and –10%, unless wider tolerance is declared by supplier.

What temperature should a ups bulb be at?

There shall be at least a 1.8°F (1.0°C) difference between the dry bulb temperature and the wet bulb temperature, always, to maintain a non-condensing environment. Exceeding the maximum ambient temperature condition of the UPS (either 35 or 40°C) will result in over-temperature alarms, transfers to bypass, and possible power electronics damage.

What is the maximum temperature a transformer can keep?

It is strongly recommended to keep its temperature 5°C – 10°C below the max allowed value of 105°C under worst case condition especially without active air flo . Main Transformer Winding T1 is the main power element allowing maximum temperature up to 130°C.

How can I reduce heat dissipation effectiveness of a power supply?

For example, enclosing the power supply with covers or mounting it close to walls or other elements creates heat traps in the system and so decrease heat dissipation effectiveness of the unit. Contact your local fi ld applications team to help to identify components of power supply with maximum rated temperatures.