隨著科技的發展，變頻控制在液壓貨梯http://www.st-image.cn/中得到越來越廣泛的應用。變頻調速具有啟停過程平穩、減少機械沖擊、增加乘員的舒適性、提高使用壽命等特點，同時也可通過改變供電頻率調節速度，節約電能，提高工作效率，但是變頻調速系統在使用過程中會存在干擾，往往會造成液壓貨梯安全事故的發生。
With the development of science and technology, frequency control to be more widely used in the hydraulic freight elevators. Frequency has a smooth start and stop the process, reduce the mechanical impact and increase occupant comfort,improve service life, but also can adjust the speed by changing the frequency of the power supply, save energy, improve efficiency, but the frequency control system in use will be the presence of interference, often causing the hydraulic freight elevator accidents happen.

液壓貨梯http://www.st-image.cn/的變頻調速系統受干擾后，會使系統程序運行失控，導致電機運行時快時慢，吊籠上下運行的速度不穩定；使控制失靈，出現停止按鈕和急停按鈕不起作用，電機停不下來等現象，可能引起液壓升降機失控或高空墜落，造成安全事故。
The frequency control system of hydraulic freight elevator after interference can cause your system is running out of control, causing the motor is running faster or slower, running up and down the cage instability speed; so out of control, the Stop button and the emergency stop button does not work, the motor can not stop such phenomena may cause loss of control or by falling hydraulic lift, causing accidents.