作为人员和货物的垂直输送设备,施工升降机(以下简称升降机)在工业和民用建筑市场应用广泛。虽然变频控制已经开始在升降机上普及,但是由于价格等因素的限制,通过接触器控制的非变频升降机依然占有绝对的优势。为了避免频繁启动保护接触器或者降低机械冲击等因素,非变频的升降机电控系统就不可避免的需要使用断电延时继电器。1常用的断电延时继电器目前,在非变频升降机中使用最多的断电延 As a vertical transportation equipment for people and goods, construction lifts (hereinafter referred to as lifts) are widely used in the industrial and civil construction markets. Although variable frequency control has started to popularize on the lift, due to the price and other factors, the non-variable frequency lift controlled by the contactor still has the absolute advantage. In order to avoid the frequent start of the protective contactor or reduce the mechanical impact and other factors, non-variable frequency lift elevator control system will inevitably need to use the power delay relay. 1 commonly used power-off delay relay At present, the most frequently used in non-variable frequency lift off delay