Appraisal outline for actual operation skills of electrical installation and repair personnel of lifting machinery

Hoisting machinery electrical installation and repair personnel must have certain knowledge of common electrical faults of cranes. Personnel engaged in this occupation need to be assessed and listed. In addition to the assessment of theoretical knowledge, the assessment of practical operating skills is also required. The editor compiled the assessment scope of his practical skills for everyone's reference and study.

F1 Basic operation skills

F1.1 Use of commonly used measuring instruments

Including the use of multimeters, clamp ammeters, insulation resistance testers, grounding resistance testers, etc.

F1.2 Identification of common electrical components

Including the identification of motors, transformers, contactors, relays, cam controllers, master controllers, resistors, circuit breakers, fuses, etc.

F1.3 Identification of commonly used symbols in electrical circuit diagrams.

F1.4 Identification of electrical technical documents, such as electrical schematic diagrams and wiring diagrams.

F2 Professional operation skills

F2.1 Discrimination and analysis of common electrical systems

Including the discrimination and analysis of the following electrical systems:

(1) Main circuit, including stator circuit and rotor circuit;

(2) Speed regulation and control loop, including AC drive control, DC drive control, etc.;

(3) Safety protection circuit, including overcurrent protection, phase failure protection, zero protection, loss of voltage protection, travel limit protection, interlock protection, overload protection, grounding protection , overspeed protection, etc.;

(4) Lighting signal circuit, including working lighting, driver's cab lighting, portable lighting, working indicators of various agencies, electric bells, fault signals, alarm signals, etc.

F2.2 Installation, debugging and repair of common electrical equipment

Including the installation, debugging and repair of motors, cam controllers, master controllers, linkage tables, resistors, control panels (cabinet, box), etc.

F2.3 Installation, debugging and repair of common electrical systems

Including the installation, debugging and repair of the following electrical systems:

(1) Power supply system (feeder);

(2) Main circuit;

(3) Speed regulation and control loop, and can change the direction of the motor according to requirements;

(4) Safety protection circuit;

(5) Lighting signal circuit.

F2.4 Installation, adjustment and repair of common electrical safety protection devices

Including the installation, adjustment and repair of the following electrical safety protection devices:

(1) Lifting weight limiter ;

(2) Torque limiter;

(3) Height and stroke limit device;

(4) Door locks and electrical interlocks;

(5) Anemometer.

F2.5 Installation and repair of grounding and zero protection wire

Including the installation and repair of the following grounding and zero protection lines:

(1) Selection of protection line;

(2) Wiring requirements and inspections for protection and grounding.

F2.6 Common electrical troubleshooting

F2.6.1 Common faults of AC contactors

Including the following faults:

(1) The coil generates heat;

(2) Increased buzzing of contactors;

(3) Contact hair is hot or burned (damaged);

(4) The main contactor cannot be connected;

(5) Cranes often trip during operation;

(6) The armature cannot fall off after the circuit is powered off.

F2.6.2 Common faults of AC motors

Including the following faults:

(1) The entire motor is uniformly overheated;

(2) The speed of the motor slows down after being loaded;

(3) The motor vibrates during operation;

(4) Sparks appear on the brush or the slip ring is burnt when the motor is working.

F2.6.3 Common faults of the controller

Including the following faults:

(1) Get stuck while working;

(2) The contact is severely burnt.

F2.6.4 Common faults of electrical control and wiring

Including the following faults:

(1) When the knife switch of the protection box is closed, the fuse of the control circuit is burned out;

(2) After the controller of a certain mechanism rotates, the overcurrent relay will act;

(3) After the main contactor is turned on and closed, the fuse of the lead-in line burns out;

(4) The motor does not rotate after the controller is closed; the motor can only rotate in one direction after the controller is closed;

(5) After the end limit switch is activated, the main contactor is not released;

(6) After the power supply is cut off (the control circuit is disconnected), the contactor of the protection box will not be disconnected;

(7) Operate the start button to blow the fuse.

F2.6.5 Common faults of brake hydraulic electromagnet

Including the following faults:

(1) The push rod of the electromagnet does not move after power on;

(2) The stroke of the push rod is small;

(3) The stroke of the push rod gradually decreases after the electromagnet works;

(4) The starting time is too long;

(5) The braking time is too long.

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