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Senkuo SKR6800 Series Smart Online Soft Starter
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Product Overview
The online soft starter produced by our company is a motor starting control device integrating advanced technology and reliable performance. Designed specifically for modern industrial production and various motor drive scenarios, it effectively reduces the impact on power grid and mechanical equipment during starting by smoothly controlling the motor starting current, providing a safe, stable and efficient starting solution for motors. Whether it is motor applications in industrial manufacturing, construction engineering, or commercial facilities, this soft starter can play a key role, improving equipment operation stability and extending equipment service life.
Safe and Reliable
Equipped with 24 protection functions including overvoltage/undervoltage/overheating/overload/phase loss, ensuring electrical safety
High Reliability
Adopts high-quality electronic components and advanced manufacturing processes, undergoes strict quality testing, ensuring stable operation in harsh environments for long periods.
Compact Design
Compact size, convenient installation, saves control cabinet space, easy to integrate into various electrical control systems.
Easy Operation
Equipped with an intuitive human-machine interface, users can easily set parameters and monitor operating status via buttons or touchscreen. At the same time, the soft starter has self-diagnosis function, which can quickly and accurately display fault information, convenient for maintenance personnel to troubleshoot and handle.
Strong Compatibility
Can be used with various types of motors, including asynchronous motors, synchronous motors, etc., with wide adaptability.
Modern Appearance
Adopts modern design, elegant appearance, suitable for various installation environments
Product Structure
Online soft starters have intelligent control functions, supporting multiple communication interfaces (such as RS485, Modbus, etc.), which can be easily connected with PLC, DCS and other control systems to achieve remote monitoring and control. Users can real-time monitor motor operating parameters and status through the host computer, perform remote operation and fault diagnosis, improving the automation level and management efficiency of the system.
- Reducing impact current: Online soft starters can make the motor current rise with a smooth curve during the starting process, avoiding the impact current up to several times or even ten times the rated current produced by traditional starting methods (such as direct starting). This not only reduces the impact on the power grid, reduces the voltage drop caused by excessive starting current, protects the normal operation of other equipment under the same power grid, but also extends the service life of motors and related equipment.
- Reducing mechanical stress: During the starting process, the soft starter can gradually increase the torque of the motor, avoiding the mechanical impact caused by the motor instantly bearing excessive torque under traditional starting methods, reducing the wear of the transmission system (such as belts, gears, etc.), reducing the cost of equipment maintenance and replacement of parts, and improving the reliability and stability of equipment.
- Precise control: Equipped with multiple starting modes, such as voltage ramp starting, current limiting starting, etc., users can flexibly choose according to different load characteristics and working conditions. At the same time, the soft starter can accurately adjust starting time, current limiting multiple and other parameters, realizing precise control of the motor starting process
- Soft stop function: In addition to soft start, online soft starters also have soft stop function. It can make the motor gradually reduce speed during the stopping process, avoiding water hammer effect (for fluid loads such as pumps) or mechanical impact caused by sudden stop of the motor under traditional stopping methods, protecting equipment and pipeline systems, and extending equipment service life.
Working Principle
- Voltage Regulation Principle
Online soft starters usually adopt thyristors (SCR) as power control components. Thyristors have the characteristic that their conduction angle can be controlled. By changing the conduction angle of thyristors, the voltage applied to the motor can be adjusted. During the starting process, the soft starter will gradually increase the output voltage, making the motor start from a lower voltage, avoiding the high voltage impact during direct starting. - Current Limiting Principle
Soft starters realize current limiting function by monitoring the motor current. During starting, it will limit the motor starting current within a set range. When the current exceeds the set value, the soft starter will automatically adjust the conduction angle of the thyristor, reduce the output voltage, and thus reduce the current. As the motor speed increases, the back electromotive force of the motor gradually increases, the current will gradually decrease, and the soft starter will correspondingly gradually increase the output voltage, making the motor eventually reach rated voltage and rated speed operation. - Control Principle
The soft starter has a control circuit inside, which can control the conduction angle of the thyristor according to preset parameters and the operating status of the motor. The control circuit usually uses a microprocessor or a dedicated control chip to process and analyze the signals collected by various sensors, realizing precise control of the motor starting process. For example, automatically adjust starting time, current limiting value and other parameters according to the motor load conditions, power supply voltage and other factors, to ensure that the motor can start smoothly and reliably.
Through the above working principles, online soft starters can realize soft starting of motors, reduce current impact and mechanical impact during starting, prolong the service life of motors and related equipment, and reduce the impact on the power grid.
Application Fields
- Industrial Manufacturing: Widely used in motor starting control of various industrial equipment such as fans, pumps, compressors, mixers, conveyors, etc. In industries such as chemical, steel, cement, paper, etc., smart bypass soft starters can effectively cope with complex load conditions, ensuring stable operation of production equipment.
- Construction Field: Used for motor starting of building water supply and drainage systems, ventilation and air conditioning systems, elevators and other equipment. Its low current starting characteristics can reduce the impact on the building power grid, ensure the stability of power supply, and reduce equipment maintenance costs.
- Municipal Engineering: In municipal facilities such as urban sewage treatment plants, water plants, pump stations, etc., smart bypass soft starters can realize smooth starting of large pump motors, improve the operational reliability and efficiency of municipal facilities, and ensure the normal operation of cities.
- Mining Industry: Applicable to motor starting of mining equipment, ventilation equipment, lifting equipment, etc. Facing the harsh working environment and heavy load starting needs of mines, the protection functions and precise control capabilities of soft starters play an important role, improving the safety and operational stability of mining equipment.
SKR6800 Series Soft Starter Peripheral Accessories Specification Parameter Table
| Soft Starter Model | Rated Power (kW) | Rated Current (A) | Air Switch (MCCB)(A) | Bypass Contactor Model (KM) | Primary Line Specification (mm²) |
|---|---|---|---|---|---|
| SKR6800-005 | 5.5 | 11 | 32 | CJ20-16 | Copper cable 2.5 |
| SKR6800-007 | 7.5 | 15 | 40 | CJ20-16 | Copper cable 4 |
| SKR6800-011 | 11 | 23 | 63 | CJ20-25 | Copper cable 6 |
| SKR6800-015 | 15 | 30 | 63 | CJ20-40 | Copper cable 10 |
| SKR6800-018 | 18.5 | 37 | 100 | CJ20-40 | Copper cable 10 |
| SKR6800-022 | 22 | 45 | 100 | CJ20-63 | Copper cable 16 |
| SKR6800-030 | 30 | 60 | 100 | CJ20-63 | Copper cable 25 |
| SKR6800-037 | 37 | 75 | 100 | CJ20-100 | Copper cable 35 |
| SKR6800-045 | 45 | 90 | 100 | CJ20-100 | Copper cable 35 |
| SKR6800-055 | 55 | 110 | 160 | CJ20-160 | Copper cable 35 |
| SKR6800-075 | 75 | 150 | 250 | CJ20-160 | Copper wire 35/Aluminum wire 50 |
| SKR6800-090 | 90 | 180 | 250 | CJ20-250 | Copper wire 50/Aluminum wire 70 |
| SKR6800-110 | 110 | 230 | 350 | CJ20-250 | Copper wire 70/Aluminum wire 95 |
| SKR6800-132 | 132 | 260 | 400 | CJ20-400 | Copper wire 95/Aluminum wire 120 |
| SKR6800-160 | 160 | 320 | 400 | CJ20-400 | Copper wire 95/Aluminum wire 150 |
| SKR6800-185 | 185 | 370 | 400 | CJ20-400 | Copper wire 120/Aluminum wire 185 |
| SKR6800-200 | 200 | 400 | 400 | CJ20-400 | Copper wire 150/Aluminum wire 185 |
| SKR6800-250 | 250 | 500 | 630 | CJ20-630 | Copper wire 185/Aluminum wire 240 |
| SKR6800-280 | 280 | 560 | 630 | CJ20-630 | Copper wire 240/Aluminum wire 300 |
| SKR6800-320 | 320 | 640 | 630 | CJ20-630 | Copper wire 240/Aluminum wire 400 |
Notes:
- Online soft starters do not require external AC contactors
- In primary line specifications, “Copper cable” is abbreviated as “Copper wire”, and aluminum wire specifications are marked separately.
- Air switch (MCCB) is the distribution circuit breaker specification, and bypass contactors need to match the soft starter model.
This product can be used with various low-voltage power distribution equipment, such as low-voltage distribution cabinets and GCK low-voltage drawer cabinets, to build a complete power distribution and motor control system. Compared with low-voltage frequency inverters, this product focuses more on the control of the motor starting stage and is suitable for scenarios that do not require speed regulation.
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