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(1)过流保护。在电机定子或电枢回路中串入过流继电器,当电机内流过超过允许值的电流时,过流继电器动作,使电机断电停止工作。 (2)短路保护。常用熔断器或自动空气开关作短路保护,熔断器有时熔断后会造成单相运行,应避免。 (3)过热和断相保护。在交流电机定子回路中串入热继电器,保护电机不过热。 (4)失压和零位保护。失压保护能在系统失电时待系统恢复供电后,机构自动恢复运行。零位保护能避免接通电源后,由于控制器手柄不处于零位造成的机构自动运行。 (5)紧急开关。在紧急情况下,司机操作
(1) over-current protection. In the motor stator or armature circuit string into the overcurrent relay, when the motor flow exceeds the allowable value of the current, the overcurrent relay action, the motor power to stop working. (2) short circuit protection. Commonly used fuses or automatic air switch for short circuit protection, sometimes blown fuse will result in single-phase operation, should be avoided. (3) overheating and phase failure protection. In the AC motor stator circuit string into the thermal relay, the motor is not overheating. (4) loss of pressure and zero protection. Loss of voltage protection can be in the system when the system power failure to restore power supply, the institutions automatically resume operation. Zero protection prevents the mechanism from operating automatically when the controller handle is not at zero after the power is turned on. (5) emergency switch. In an emergency, the driver operates