Intelligence turns the structure of soft starter, function, breed and application

5 ～ 8.

Electromotor of 5kW low power is simple the starter of brae of voltage of ATS series VR2 of utility. The controls principle ATS soft starter control principle of graph 2ATS soft starter is shown 2 times like the graph. Pass G of elapse phase angle, it is till electromotor electric current 0 later, retouch sends silicon controlled rectifier. This technology can make sure electromotor is in start after finishing successive and smooth roll, have admirable stability: Microprocessor controls the main job parameter of starting unit and electromotor, undertake optimizing ceaselessly. Soft starter is brake of a brilliant actually the canal is pressure regulating the circuitry of timing. Its job principle is to pass what change brilliant brake is in charge of to spark horn, adjust brilliant brake canal is pressure regulating the output voltage of circuit. Its characteristic is electromotor rotate speed becomes direct ratio with the square of stator voltage approximately. When soft starter starts motor, brilliant brake canal guides completely, make electromotor job is on the physical characteristic of rated voltage. The starting voltage that 3 basic skill can start voltage soft starter is in 35% ～ 65%(even 20% ～ 95%) is rated between voltage adjustable, start torsion to start torsion directly for 10% ～ 36%(or 4% ～ 90%) at this moment. Start of conflict of arteries and veins moves means to if the static resistance such as extruder, mixer and leather belt conveyer is greater,have some of load, must bring to bear on short the large starting moment of force when, in order to overcome great static friction power, installed conflict of arteries and veins to jump on soft starter so means, can short when output the rated voltage of 95% (be equivalent to) of 90% direct starting torsion, 0 ～ 400ms can accuse. Conflict of arteries and veins jumps after the end, according to brae set the value continues to start. The output voltage weaveform in cycle of a job is like soft starter the graph is shown 3 times. Graph 3 after quickening brae to control electromotor to begin roll, can control electromotor voltage linear to increase, quicken time to be able to be inside certain limits (adjust like 1 ～ 999s) . Still can offer electric current to be restricted (if be in 200% ～ 500% electromotor are rated between electric current adjustable) start quicken means, can make electromotor linear quickens rated rotate speed. Quicken brae action Yu Xiaogong to lead electromotor, and fast brae is used at inertial large facility. Moving condition is weak start have 4 kinds of moving state: ① spans operation pattern: Brilliant brake canal is in complete on-state, electromotor works at total pressure means, voltage brae heft is OK and complete oversight, commonly used at short when reduplicative electromotor. Mode of job of ② contactor bypass: Achieve in electromotor full fast when moving, will replace the soft starter that already finished the job with bypass contactor, can reduce the hot loss that brilliant brake runs so, improve systematic efficiency. Can start much stage motor with a soft starter. ③ is energy-saving operation pattern: When electromotor when negative charge is smaller, soft starter reduces the tension that brings to bear on to go up at electromotor stator automatically, reduce weight of excitation of electromotor electric current, raised the power element of electromotor thereby, had energy-saving effect. ④ is pressure regulating timing pattern: Soft starter can be made pressure regulating timing moves, because electromotor rotor internal resistance is very little, want to get large-scale timing, need to string together proper resistor in electromotor rotor. Stop a function of this function stop means to have 4 kinds: ① freedom jockeys: Direct dump, electromotor freedom jockeys. ② is soft stop: Do not hope electromotor balks sometimes, use soft suspend way. In receive after stopping machine signal, electromotor carries voltage to be reduced gradually, rotate speed drops to be able to adjust brae time (like 1 ～ 999s) . ③ pump stops: Apply to the pump drive with force lesser quadrature, eliminate " water hammer effect " . ④ d.c.braking: Should give out after shutdown alarm, accelerate dc infuse electromotor apply the brake, d.c.braking time can choose between 0 ～ 99s. Basically use at the load with force big moment or need to stop the circumstance of machine quickly. Still can use at accurate jockey function, this function is used at asking fixed position controls the circumstance that jockey. ⑤ protection and monitoring: Soft starter offers the monitoring of equipment and frequent breakdown to diagnose information with character type monitor, its protective function has: Current limliting, 2 ～ electric current of 5 times electromotor is adjustable: By I2t load the curve provides overload protection: Input, output is short of, 3s tripping operation: When brilliant brake is in charge of overheat of short circuit, radiator and rotor locked-rotor, the tripping operation inside 200ms: When the resistance of the thermal resistor inside electromotor is more than a regulation to be worth, the tripping operation inside 200ms: CPU breakdown, 600ms closes machine: When overload of hot fault signal, electromotor and temperature rise exceed critical threshold value, stop machine. Stop machine hind, if electromotor temperature still exorbitant, the hot control equipment of soft starter can prevent to start afresh: Photograph breakdown and phasic lopsided, LED and output relay issue signal: Soft starter still has power source to drop the protection such as report, under-voltage, overvoltage. LCD of intelligent soft starter can show temperature of factor of electric current, voltage, power, power, electromotor, run time. In communication respect, provided serial communication opening of the standard, can set parameter with menu form through clavier and LED. Other step-down starting means cannot be likened to the starting way that 4 application intelligence changes soft starter and distinctive function, accordingly its applicable is in a variety of laden control systems, be like: Machine tool, cast equipment, facility for transporting, transmission belt, fan, compressor to wait. 5 notes soft starter applies a note to be as follows. Graph 4 because soft starter did not invert,control a function, of equipment, invert to still come true by contactor. To assure equipment soft start, but of will soft starter but contact of hardware of process designing standard receives contactor to dominate return circuit: In the meantime, in soft starter the Yi Ke in dominating return circuit introduces the auxiliary contact of contactor, its control a principle to see a picture 4. Soft starter has a variety of inside the protective function of buy, if test of stall, locked-rotor, alternate with is balanced, owe pressure protection, owe carry protect and press protection to wait too. When designing line, answer to choose to protect a function according to particular case through process designing, or make certain function invalidation, how to move in order to ensure completely reliable. Because soft starter itself does not have short circuit protection, to protect among them brilliant brake canal, should use fast fuse. Make when soft starter electromotor apply the brake stops when machine, it is brilliant brake canal does not guide only, did not form electric segregation between electromotor and power source. If overhaul the circuitry after soft starter, electromotor right now, that is insecure, dominate return circuit in electromotor so in, answer to increase breaker before soft starter. Soft starter will produce hot dissipation when carrying electricity, should notice to be on its when installation, lower part and right-and-left put apart a space, be apart from equipment fluctuation 100mm, or so 50mm commonly. Soft starter is general should perpendicular installation. Should avoid to stand by soft starter generation caloric place to install. Soft starter of 6 last words is a kind new-style, the starting fit with good performance, it is the first selection product that communicates asynchronous electromotor, drop as the price ceaselessly, applied range will be wider and wider, replace traditional starter stage by stage thereby. CNC Milling CNC Machining