The code name of the national standard protection device is F, and the motor comprehensive protector may use FM to indicate that it does not conflict with other codes (M in the national standard code stands for motor), or it may have a specific meaning. However, there are three main functions of motor comprehensive protector: short-circuit protection, overload protection and open-phase protection.

At present, many motor comprehensive protectors are developing in the direction of intelligence, and many functions are derived, such as avoiding motor damage caused by possible faults such as overload, overheating, locked rotor, undervoltage, light load, open phase, three-phase imbalance and grounding. The wiring of the protector varies from manufacturer to manufacturer, so the electrical schematic diagram is drawn according to the schematic diagram of the motor comprehensive protector of different manufacturers and models.

Because drawing electrical schematic diagram involves electrical connection and wiring, it is best to draw specific equipment block diagrams, such as common DC drive equipment.

Extended data:

JES is a "comprehensive motor protector". It is mainly used to control and protect loads such as fans, pumps and motors.

JES series products adopt modular single product structure, which integrates the main functions of traditional circuit breakers (fuses), contactors, overload (or overcurrent, phase failure) protection relays, starters, isolators and so on. It has the functions of remote automatic control and local direct manual control, panel indication and electromechanical signal alarm, overvoltage and undervoltage protection.

It has the functions of open-phase and open-phase protection, and has coordinated time and current protection characteristics (inverse time limit, fixed time limit and instantaneous three-stage protection characteristics). Selecting functional modules or accessories as needed can realize the control and protection of various motor loads and distribution loads.

JES series products are mainly used in power systems with AC 50Hz(60Hz), rated voltage below 690V, rated current 3A to 100A, and working current 0. 12A to 100A. Under normal conditions (including specified overload conditions), current can be connected, carried and disconnected, and under specified abnormal conditions.

As far as its structure and function are concerned, JES series products are no longer single products such as contactors, circuit breakers or thermal relays, but a set of control and protection systems. Its appearance fundamentally solves the problem of traditional use of discrete components (usually circuit breakers or fuses+contactors+overload relays).

Various problems of unreasonable coordination between control and protection caused by unreasonable selection, especially the uncoordinated coordination between protection characteristics and control characteristics in the combination of electrical products with different assessment standards, have greatly improved the operational reliability and continuous operation performance of the control and protection system.

JES series products are the best substitutes for low-voltage electrical appliances such as circuit breakers, contactors, thermal relays and fuses.

References:

Baidu encyclopedia-motor comprehensive protector