继电器是液压货梯http://www.jnliqiao.com/上的重要部件之一，长期使用也会出现失效的状况，就会严重影响液压货梯的正常工作。那么如何判断液压货梯继电器是否失效呢?
　　
1、液压货梯继电器线圈通电时不动作。
Hydraulic freight elevator does not move when the relay coil is energized.
　
2、液压货梯继电器线圈断电时不返回。
Hydraulic freight elevator does not return when the relay coil is de-energized.
　　
3、液压货梯触点发生熔接或其他形式的粘接。
Welding or other forms of bonding hydraulic freight elevators contacts occur.

4、液压货梯闭合触点的接触压降超过其规定范围内的极限值。
Hydraulic freight elevator closed contact contact pressure drop exceeds its limit within a predetermined range.
　
5、液压货梯http://www.jnliqiao.com/试品零部件有破坏性损坏，连接导线及零部件松动。
Hydraulic freight elevators destructive damage to parts of the test, the connection wires and loose components.