Zhejiang SHUYI Electric Co., LTD

The role of the intermediate relay So why distinguish between intermediate relays and AC contactors? AC contactors mainly play the role of controlling the power supply in the circuit and are used in the main circuit of the main circuit, while the intermediate relays mainly exist in the control circuit, which controls the circuit, Convert and expand the role of contacts. When the auxiliary contacts of the AC contactor are not enough, the contacts of the intermediate relay can be used instead. However, the contact capacity of the intermediate relay is relatively small, generally around 5A. It is possible for circuit feedback or control, but It cannot directly drive high-power loads. What is the difference between AC and DC? Having said so much, what is the difference? First of all, we need to understand that AC means AC voltage level, commonly used are 220VAC, 380VAC. DC means DC voltage level, commonly used are 12VDC, 24VDC, if you want to get DC voltage requires the use of a switching

Generally, the soft start specification of low-voltage motor is 5.5-600KW, which is mainly used for the start and operation protection of different power motors. The power cabinet with soft starter can not add other motor protection products, only the circuit breaker, soft start, measuring instrument and related buttons in the cabinet can be. Because the soft starter has integrated current and voltage protection, such as overcurrent, overload, undervoltage and lack of equal. There is no need to add additional protectors. If the high power soft starter debugging cabinet is best with a light bulb. For example, 200KW with a small motor can start, very fast, because the rated current of the small motor is small, high-power soft starter can not detect the running current, it will report the lack of phase fault. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #softstarter #softstarterprice #softstartcabinet #ZJSHUYI #Chinashuyi

Main voltage range, main current range, control voltage, soft start time, soft stop time, initial voltage. Motor soft start is to achieve smooth start of motor and mechanical load by adopting technical means such as voltage reduction, compensation or frequency conversion, reducing the impact of starting current on the power grid, and protecting the power grid and mechanical system. Make the output torque of the motor meet the requirements of the mechanical system for the starting torque, ensure smooth acceleration, smooth transition, and avoid destructive torque impact; make the starting current meet the requirements of the motor's bearing capacity, and avoid the insulation damage or burning caused by the motor's starting heat; make the starting current Meet the requirements of relevant standards for power quality of the power grid, reduce the voltage sag amplitude, and reduce the content of high-order harmonics. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355

Inverter and servo drive are the most widely used driving equipment in the transmission system. When talking about the difference between the two, many people only know that inverter is often used in low-end mechanical equipment, while servo drive is mostly used in high-end mechanical equipment. This is a relatively general statement. Frequency converter is a power control device that uses the on-off function of power semiconductor devices to convert power frequency power into another frequency. It can realize the functions of soft start, frequency conversion, speed regulation, improving operation accuracy and changing power factors of AC asynchronous motor. Frequency converter can drive frequency conversion motor, common AC motor, mainly acts as the role of adjusting the motor speed. Frequency converter is usually composed of rectifier unit, intermediate circuit, inverter and controller. Servo system is an automatic control system that enables the object's position, orientation, s

How to control soft start with buttons 1. First understand the secondary control loop of soft start. Generally, soft start has bypass contactor output node. 2. Know the load start-up time again. The best time to cut the bypass contactor is after the start-up process is completed. 3. The main circuit of the bypass contactor should be connected in parallel with the soft starter. 4. String the output node of the bypass contactor into the control loop of the bypass contactor, preferably a self-locking loop. Among them, the external contactor is used for direct starting, which is in a parallel relationship and requires electrical interlocking. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #softstarter #motorsoftstar #softstarters #softstartechnology #latestpowerstarter #softstarterby -passconnector

1. When the motor current in the inverter is set too large, the motor protection parameter is set too large, and the inverter cannot protect the motor according to the actual current of the motor when the motor is overloaded, which will cause the motor to overload, heat, or burn. 2. When the motor speed is not set correctly, if the set speed exceeds the rated speed of the motor, the motor will run in the constant power area at a higher speed at the rated frequency point. The higher the speed, the smaller the output torque, which will cause the motor Excessive current overheats or burns the motor. 3. If the acceleration and deceleration time of the motor is too short, the inverter will report an overcurrent fault for protection. 4. The inverter adopts vector control, but the motor and the inverter do not have paired self-learning, which causes the parameters of the inverter to control the motor to be inconsistent with the actual value of the motor, causing the control accuracy to deteri

Usually the soft start system is composed of softstart device, peripheral circuit and motor load. Therefore, the objects protected by the soft start system are also the soft start device, peripheral circuit and motor load. The purpose of protecting the soft start system is to ensure the safe and reliable operation of thyristor components, #softstarter equipment and circuits, and not damage or cause safety accidents under various abnormal working conditions. The premise of #softstarter protection is that the design of the soft starter itself should be correct. The thyristor components are correct and used correctly, the drive circuit and the control circuit are reasonably designed and matched with each other, so that the device can work in a good state. These measures are the basis for the safe and reliable operation of the soft starter. Only under this premise, can the devices, circuits, and equipment fail less and not fail from the inside, and the optimized system design should aim

Influence of switching frequency on inverter output current The inverter (DC/AC conversion) part of the inverter is formed by the IGBT through the sine pulse width modulation SPWM, and then through the motor winding to form a sine wave current waveform. Then the size of the switching frequency directly affects the quality of the current waveform, as well as the size of the interference, and the size of the switching frequency is more sensitive and direct. Consider adding various harmonic suppression devices, such as AC reactors, DC reactors, filters, additional sequence reactors, as well as installation wiring, grounding and other measures. This approach is more reasonable and effective, and must not be reversed. To deal with the problem, this is a very important principle. When the switching frequency is high, the current waveform is sinusoidal and smooth. In this way, the harmonics are small, the interference is small, and vice versa, when the switching frequency is too low, the effe

The advantages of the built-in #softstarter can be roughly divided into the following four points: the first circuit is simple The built-in bypass soft starter adopts the wiring method of three inputs and three outputs. The second is natural air cooling. The thyristor is only responsible for starting and stopping, which avoids the power consumption and heat dissipation caused by the online operation of the thyristor. The third saves the space of the complete set, and does not need to install an AC contactor. The fourth and better protection function is due to the integrated design of the thyristor and the mechanical contact. The intelligent controller realizes that the mechanical contact has no arc, so that the electrical life of the mechanical contact is equal to the mechanical life, which solves the problem that the contactor has long been difficult to achieve. Compared with the bypass soft starter, the reliability of the contactor is greatly improved. www.shuyitop.com; Tel/Fax: 00

The soft start is mainly composed of three pairs of anti-parallel thyristor voltage regulating circuits connected in series between the power supply and the controlled motor. Modern soft starters basically use power electronic technology and microcomputer control technology, and use a single-chip microcomputer as the central controller control core to complete the measurement and various control algorithms. Therefore, the soft starter has a strong function and flexibility. The whole starting process is carried out automatically under the control of digital program software. Using the electronic switching characteristics of the three pairs of thyristors, the size of the trigger angle is changed by controlling the trigger pulse sooner or later by the MCU or the single-chip microcomputer. And changing the size of the trigger conduction angle changes the conduction time of the thyristor, and finally changes the size of the three-phase voltage of the stator winding. www.shuyitop.com; Tel/F

Debug sequence of soft starter: 1. Selection of starting mode and starting time of soft starter: ① For soft starters of general power, the larger the load, the longer the starting time; ② When the quality of power supply of the power grid is relatively high, the current limit start can be selected, and the same load The larger the value, the longer the startup time should be. 2. Check whether the motor can rotate normally and flexibly, otherwise it will never start. 3. Check the parameters of the fan, motor and soft starter. Parameters checked include voltage, current, power, and the number of poles of the motor. 4. The commissioning sequence is manual cranking, air-dropping control loop, motor idling, and running with load. 5. Check the insulation resistance of the motor. This work must be done before the motor is connected to the soft starter, because the starting circuit is composed of thyristor components. When the motor and the soft starter are connected, if the motor insulation r

According to the operation mode: there are electric operation, energy storage operation and manual operation; According to the structure: there are universal type and plastic shell type; According to the category of use: optional and non-selective; According to the arc extinguishing medium: oil-immersed, vacuum and air; According to the action speed: there are fast type and ordinary type; According to the number of poles: there are unipolar, bipolar, tripolar and quadrupole, etc.; According to the installation method: there are plug-in type, fixed type and drawer type. A circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a release, and a casing. Web: www.shuyitop.com; Tel/Fax: 0086-577-62840011 Wechat/WhatsApp: 008613355775769 #ZJSHUYI #Chinashuyi #shuyitop #breakers #MCB #MCCB

Reasons why the motor soft starter cannot start: The parameter setting is unreasonable Solution: Re-adjust the parameters, increase the initial voltage appropriately, and lengthen the time appropriately. Full load start at start Solution: try to reduce the load when starting. Motor phase loss Solution: Check the motor and peripheral circuits. The main component thyristor in the soft starter is short-circuited Solution: Check whether the motor and grid voltage are abnormal, and contact the manufacturer to replace the thyristor. Filter board breakdown short circuit Solution: replace the filter board. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #softstarter #softstarterprice #ZJSHUYI #Chinashuyi #acmotorsoftstarter

Main circuit terminal wiring 1. The three-phase input power is connected to the R, S, and T input terminals of the motor soft starter after passing through the circuit breaker. There is no phase sequence requirement for the three-phase power supply. 2. To control the running and stopping of the motor soft starter, the run and stop keys on the operation panel or an external control loop should be used. 3. The motor soft starter is connected to the bypass electromagnetic contactor, and the phase sequence of the bypass connection is consistent and corresponding. 4. Capacitors and surge absorbers shall not be installed between the output terminals of the soft starter and the motor. 5. The grounding terminal of the motor soft starter must be well grounded. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #softstarter #motorsoftstar #softstarters #softstartechnology #softstartermarket #softstarterprice #ac powersoftstarterwithbuilt-inbypass #builtinbypasssoftst

Soft starter is mainly used to protect the soft start of the motor, a protection device of soft stop, so do you know what fields soft starter is suitable for? 1. Occasions where the starting current of the motor is required to be reduced. 2, normal operation of the motor does not need to have speed regulation function, only to solve the starting process of the working state. 3. The load is not allowed to step-down or slow down during normal operation. 4, the motor power is large (such as more than 100kw), starting will cause adverse effects on the operation of the main transformer. 5, the motor operation to the grid voltage requirements are strict, the voltage drop is not more than 10%U. 6. The equipment is precise and the starting impact of the equipment is not allowed. 7, the starting torque of the equipment is not large, can be no-load or light load starting. 8. Medium and large motors need to start energy-saving. From the initial investment point of view, it is more economical to u

In principle, the selection of the #softstarter should be larger than the capacity of the motor being driven. The rated capacity of the soft starter usually has two kinds of nominal: one is nominal according to the power of the corresponding motor; the other is nominal according to the maximum allowable current of the soft starter. The following two points should be noted: 1) Based on the nominal rated capacity of the motor, the rated current of products with different voltage levels is different. 2) It is nominally based on the maximum allowable working current of the soft starter, and the rated capacity of products of different voltage levels is different. In addition, comprehensive consideration should be given, such as the load capacity of the soft starter, working system, environmental conditions, cooling methods, etc. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #softstarter #motorsoftstar #softstarters #softstartechnology #solidstatesoftstarte

Soft starter input power failure 1. Check whether the input power is normal step by step. First, check whether the input power of the soft starter is normal. If the input power is abnormal, check whether the fuse is blown and whether the circuit breaker is out of phase. 2. If it is determined that the input power supply is normal, first consider replacing the soft-starting motherboard. This fault has occurred many times due to the quality of the motherboard. The soft starter panel has a black screen and no display 1. For such faults as blurry screen and black screen, most of them are quality problems, and the only way is to replace the soft-start motherboard. 2. If there is no display on the panel, first check whether the soft start control power supply (AC 220V) is normal. If the power supply is abnormal, then measure whether the fuse is blown, whether the circuit breaker is out of phase, and whether the control power line is disconnected. www.shuyitop.com; Tel/Fax: 0086-577-62840011

Advantages of plastic-case circuit breaker: 1.MCCB protects the circuit from overload and short circuit. It's a safety device. 2.MCCB covers current ratings between 15 A and 2500 A and interrupt ratings of 480 V AC up to 150 kA. 3.MCCB ensures high performance in extremely small and compact sizes. 4. Due to the use of dual insulation technology, electrical accessories can be installed directly on the site where the circuit breaker is installed. This can significantly save time and therefore cost. 5.MCCB can have electronic thermal magnetic trip unit. You can adjust the current and time values using the trip unit. 6. The MCCB is also available in all versions: stationary, plug-in and withdraw-type, and it is easy to switch from stationary to plug-in/withdraw-type circuit breakers thanks to a special kit. 7. The MCCB comes with a complete range of accessories to meet a wide range of operational and automation requirements. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsA

Contactor is generally composed of contactor electromagnetic mechanism, contact system, arc extinguishing device, spring mechanism, bracket and base and so on. For electric power operators, the most important thing we use is: AC contactor coil + contactor contact system. The contact of AC contactor can be divided into main contact and auxiliary contact. The main contact is normally open and applied in the main loop, and the auxiliary contact is applied in the control loop with the contactor coil. The operation of the circuit is controlled indirectly through the control of the contactor coil. Electrical suction of contactor. Normally open means initially disconnected, normally closed, initially switched on. After the contactor is electrically drawn, normally open and open, normally closed and disconnected. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #softstarter #motorsoftstar #softstarters #VFD #contactor #ACcontactor #ZJSHUYI #BypassContactor

Usually the soft start system is composed of #softstart device, peripheral circuit and motor load. Therefore, the objects protected by the soft start system are also the soft start device, peripheral circuit and motor load. The purpose of protecting the soft start system is to ensure the safe and reliable operation of thyristor components, #softstarter equipment and circuits, and not damage or cause safety accidents under various abnormal working conditions. The premise of #softstarter protection is that the design of the soft starter itself should be correct. The thyristor components are correct and used correctly, the drive circuit and the control circuit are reasonably designed and matched with each other, so that the device can work in a good state. These measures are the basis for the safe and reliable operation of the soft starter. Only under this premise, can the devices, circuits, and equipment fail less and not fail from the inside, and the optimized system design should ai

Main components: 1, thyristor: Each phase of a pair of reverse parallel thyristor, which is the main power component, is also one of the main costs of soft starter, reverse parallel thyristor manufacturers on the market are many, from cheap to expensive, quality is uneven. 2, control motherboard: basically every manufacturer has their own development of the motherboard, there are a lot of general motherboard on the market, the quality is not good or bad. Take the executive components on the motherboard - optocoupler, for example, if the quality is not good or bad, even if the other parts are good, the soft starter has to rest. Why? Because the optocoupler is easy to bad in harsh environment, and the soft starter itself is a large current environment, starting the current is large voltage drop, the working power supply fluctuation on the motherboard is also large, it is also easy to cause interference to these components, thereby indirectly leading to damage. www.shuyitop.com; Tel/Fax:

The frequency converter is indispensable in our daily life, so what is the function of the frequency converter? (1) The frequency converter reduces the voltage fluctuation of the power line; (2) The inverter controls the starting current of the motor; (3) The power required by the inverter to start is lower; (4) Controllable acceleration function; (5) Adjustable running speed; (6) Adjustable torque limit; (7) Controlled stopping methods; (8) Reversible operation control; (9) Energy saving; (10) Reduce mechanical transmission parts. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #VFD #INVERTER #frequencyinverter #frequencyconverter #Chinashuyi #converter #inverters #vfds #vfdmarket #ZJSHUYI #SHUYITOP

AC contactors often use three arc extinguishing methods: double-break electric arc extinguishing, longitudinal seam arc extinguishing and grid arc extinguishing. It is used to eliminate the arc generated by the moving and static contacts during the opening and closing process. Contactors with a capacity of more than 10A have arc extinguishing devices. AC contactors also have auxiliary components such as reaction springs, buffer springs, contact pressure springs, transmission mechanisms, bases and terminals. The working principle of the AC contactor is to use the electromagnetic force to cooperate with the spring force to realize the connection and disconnection of the contacts. The AC contactor has two working states: de-energized state (release state) and electrified state (action state). When the attraction coil is energized, the static iron core generates electromagnetic attraction, the armature is pulled in, and the connecting rod connected to the armature drives the contact to mov