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Motor soft starter cabinet
IntelligentMotor soft starter cabinet(Instrument)
Soft starter, also known as SMC intelligent soft starter (contactless solid-state controller), is a new concept product for motor starting, which completely replaces old starters such as star delta starter, autotransformer, and magnetic control starter, and is widely used in various industrial fields. The SGKR series motor soft start cabinet produced by Shenyang Shengong Electric adopts domestic and foreign famous brand components and is finely crafted. It is also highly recognized by customers, along with the company's famous products such as fire inspection cabinets, smoke exhaust fan control boxes, fire control cabinets, and emergency start cabinets for fire machinery.
Intelligent soft starter is a new technology that combines microprocessors and high-power thyristors. It uses microprocessors to control the conduction angle of thyristors, thereby changing the output voltage of thyristors. Through program control of the change in thyristor conduction angle, the output voltage of thyristors can be controlled, so that the starting and stopping speed of the motor meets the requirements of the water pump starting/stopping process. Soft start/stop is of great significance for the piping system of water pumps to prevent water hammer and improve equipment service life.
Performance characteristics of motor soft starter cabinet
1. The core control components adopt internationally leading microprocessors and high-power thyristors, with reliable quality and long service life;
2. Flexible combination potentiometer type parameter setting, clear LED status and fault indication, extremely convenient to use;
3. The electronic comprehensive protector built into the soft starter provides more effective protection for the motor than conventional bimetallic strips;
4. Solid state contactless control, no noise, small size, reduces installation space, and is easy to install;
5. The rise time of the starting current during the starting process can be adjusted to achieve smooth acceleration of the water pump motor;
6. By adopting digital integration technology, various technical performance indicators are greatly improved, making it more reliable and stable;
7. The microprocessor controls the current limiting start to avoid torque impact on the water pump motor and impact on the power grid and pipeline network;
8. The core microprocessor is an industrial grade product with strong anti-interference ability, good stability, and good environmental adaptability;
9. Using fuzzy control theory to limit current or slope control during the starting process, in order to avoid resonance phenomena during the starting process;
10. The starter can be fully started with a speed contact output and can be connected to an external bypass contactor, which can extend the life of the starter.
SGKR series motor soft starter cabinet product introduction
【 Product Overview 】 The SGKR series motor soft start cabinet is a new product independently developed by our company. It is the only soft start cabinet product in China that does not require a bypass contactor. The series of products eliminates many costs caused by external bypass wiring and represents a new breakthrough in the economic, practical, and convenient application of soft start. It is a model for the popularization of soft start applications. The SGKR series products are suitable for starting control and protection of three-phase AC asynchronous motors (squirrel cage motors). The product specifications range from 22kW to 800 kW and can meet the frequent starting needs of three-phase 380V motors, suitable for areas with an altitude of up to 2200 meters.
[Performance and Features]
1. Powerful protection function: It has multiple protection functions such as overload, overvoltage, undervoltage, overcurrent, short circuit, ground, overheating, and incoming and outgoing line loss.
2. Long service life and low maintenance cost: without the need for bypass contactors, the entire process from starting, running to stopping is achieved by the almost perfect contactless control technology of thyristors, greatly extending the service life of the starter cabinet and reducing maintenance costs.
3. Wide applicability: The main circuit has no mechanical switches, so there are no contacts, no arcs, no open flames during operation, and it can adapt to harsh environments such as smoke and dust.
4. Easy to operate and user-friendly for both new and old electricians: the adjustment of starting time, starting voltage, and starting current only requires the use of a "screwdriver" to rotate and adjust on the potentiometer. The operation is concise and intuitive, avoiding the complex adaptation process of data setting and code management, and can be easily applied by both new and old electricians.
5. Small size and light weight: The product has a small size and weighs only about one-third of the self coupling pressure reducing starter box, making it particularly convenient for retrofitting old equipment; Some products can be directly hung on the wall for use.
6. Reliable quality: Adopting leading intelligent control technology and rigorous factory experiments, the product has excellent reliability in use.
7. Energy saving and consumption reducing: In a customer experiment in Shanghai, the gravel processing plant changed from a self coupling starter cabinet to using 7 SGKR motor soft start control cabinets (online energy-saving type), saving more than 3000 yuan in electricity bills per month. Note: The power of the 7 control cabinets varies. Energy King: The electricity saved within a year is enough to offset the purchase price of the starter cabinet.
8. Start at any time, unrestricted: This starter cabinet can be started as needed without cooling restrictions. Example: The self coupling starter cabinet cannot be started more than twice per hour.
【 Scope of application 】 Pumps (fire protection, water supply, sewage treatment, oil, etc.), fans, blowers, extruders, centrifuges, mixers, conveyors, ball mills, thrusters, anchorages, winches, bilge sewage pumps, refrigeration compressors, crushers, rolling mill compressors (screw, plunger, centrifugal, turbine, etc.).
[Product Ordering Notice] When placing an order, please provide the working voltage, rated power, and application field of the motor. For special specifications or requirements, please consult by phone.
The above is the detailed information of the water pump soft start cabinet. If you have any questions about the price, manufacturer, model, or pictures of the water pump soft start cabinet, please contact us for the latest information.
SGKR motor soft start cabinet specifications
Comparison of common starting methods for motors
The commonly used starting methods for motors can be roughly divided into four types, namely: direct starting; Star delta voltage reduction startup; Self coupling voltage reduction startup; Intelligent soft start. They each have their own startup characteristics and corresponding advantages and disadvantages.
Comparison of common starting methods for motors
In the table, UN - rated voltage of the motor;
Is - motor full voltage starting current;
Ms - motor full voltage starting torque;
K - The ratio of starting voltage to rated voltage, also known as the autotransformer ratio, is generally not higher than 0.65.
Torque and current curve
Full pressure direct start
Starting current:
4-8 times the nominal current
Starting torque:
0.5-1.5 times the starting torque
Features:
-3 terminal motor, low to medium power
- Load start
- High current peak and large voltage drop starting
- Simple equipment
Star Triangle Voltage Reduction Start
Starting current:
3-5 times the nominal current
Starting torque
0.5 times the nominal torque
Features:
-6-terminal motor, low to medium power
High peak current and torque occur during the switching of "Star Triangle"
- High current peak and large voltage drop starting
- Equipment needs maintenance
Self coupling voltage reduction starting
Starting current:
3-5 times the nominal current
Starting torque:
0.4-0.85 times the nominal torque
Features:
-3 terminal high-power motor
- When starting with voltage changes, there is a large voltage drop and high current peak
- Heavy and complex equipment that requires maintenance
Intelligent soft start
Starting current:
Adjustable between 2.5-3.5 times the nominal current
Starting time 0.5s-60s (extended starting)
Starting torque:
Can vary between 0.15 times the standard torque and nominal torque
Features:
-3 terminal motor, nominal power up to 530KW
- Independently adjustable acceleration and deceleration time
- Equipment does not require maintenance
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