PP826 ABB 面板 瞬态过电压的协调因子

PP826 ABB 面板 瞬态过电压的协调因子

规范中提供了操作面板PP826的最高环境温度。环境温度是指用于冷却面板电子设备的设备机柜中的温度。

在大多数情况下，PP826操作面板的环境温度明显高于设备机柜的环境温度。如果机柜很高，并且有许多发热设备，则机柜顶部的温度将大大高于预期的理论温度升高。所有的电子设备都对热敏感。温度升高8-10°C，电解电容器的寿命减半。15-20°C的温度升高会导致四分之一的寿命等。

Rittal有一个很好的程序来估计机柜中的预期平均温度，也有一个控制设备机柜中温度的大型程序。搪瓷涂层钢制橱柜的辐射热值为5.5 W/m2，温度为°C。在机柜内安装风扇可以使温度均匀，而移动的空气比静止的空气提供更好的冷却效果。合适的风扇是120 x 120 mm轴流风扇，有24 V DC、115 V AC和230 V AC。安装风扇，使其位于较冷的区域，并将冷空气吹向操作员面板。

PP826 ABB 面板 瞬态过电压的协调因子

The maximum ambient temperature for the operating panel PP826 is provided in the specification. Ambient temperature refers to the temperature in the equipment cabinet used to cool panel electronics.

In most cases, the ambient temperature of the PP826 operation panel is significantly higher than that of the device cabinet. If the cabinet is high and there are many heating devices, the temperature at the top of the cabinet will be much higher than the expected theoretical temperature increase. All electronic devices are sensitive to heat. When the temperature rises by 8-10°C, the life of electrolytic capacitors is halved. A temperature increase of 15-20°C will lead to a quarter of the lifetime etc.

Rittal has a good program to estimate the expected average temperature in the cabinet, and also a large program to control the temperature in the equipment cabinet. The enamel coated steel cabinet has a radiant heat value of 5.5 W/m2 and a temperature of °C. Installing a fan inside the cabinet can even out the temperature, and moving air provides a better cooling effect than still air. A suitable fan is a 120 x 120 mm axial flow fan with 24 V DC, 115 V AC and 230 V AC. Install the fan so that it is located in a cooler area and blows cold air towards the operator panel.

PP826 ABB 面板 瞬态过电压的协调因子