1、如果河北升降貨梯http://www.qdysj.net/電源從高電位端出來后先經過部分控制開關到河北升降貨梯制動器線圈，然后再經部分控制開關回到零線，則會有安全問題。因為，此時如果抱閘線圈低電位處因絕緣損壞而對地時，后面的開關會被短接而失效。
If Shandong Huoti first power from the high potential side out after a part of the control switch to Shandong Huoti brake coil, and then switch back to partially control the zero line, then there will be security problems. Because, this

time due to insulation damage on the ground, the back of the switch will be short and fail if the brake coil at low potential.

2、如果河北升降貨梯http://www.qdysj.net/電源從高電位端出來后直接經過河北升降貨梯制動器線圈，再經各控制開關回到零線，則問題會更大。此時，如果河北升降貨梯抱閘線圈低電位處因絕緣損壞而對地時，制動器上的所有開關將全部失效，制動器會因直接通電而自動開閘，制動器抱閘無法合閘制動。
Directly through Shandong, Shandong cargo lifter lift if the power from the high potential side out after the freight elevator brake coil, and then switch back to the zero line of the control, then the problem will be even greater. At

this point, if the brake coil Shandong cargo lifter at a low potential to cause damage to the insulation, all the switches on the brake will all fail, the brake automatically because of direct electrical gate, brake brake brake can not be closing.