When a cage-type asynchronous motor starts at full voltage, it will generate a large inrush current (generally 5 to 8 times of Ie). Especially, the direct starting of a large-capacity motor will cause interference to the power grid and other loads, and even endanger the safe operation of the power grid. At the same time, due to the large starting stress, the service life of the load equipment is reduced. When the motor stops, if the drive system suddenly loses torque and relies on the friction torque of the system to overcome the inertia of the system and coast to a stop, it will also bring many problems to the drive system, such as the water hammer phenomenon of a water pump.
The SGQ8 series low-voltage solid-state soft starter cabinet of Simo Motor is a new type of motor starting equipment with domestic leading level, designed by adopting advanced power electronics technology, micro-processing technology, and modern control theory. It can be widely used for the starting of cage-type asynchronous motors below 500KW in industries such as cement, chemical industry, iron and steel, metallurgy, and mining. It is an ideal product for replacing traditional reactance cabinet starting, Y-△ starting, and autotransformer step-down starting. This product has a variety of starting modes, which can effectively limit the starting current of the asynchronous motor during starting and prevent the impact on the power supply system. It can be widely applied to the starting of various light-load and heavy-load motors. When stopping, it can adopt the methods of free parking and soft parking, which maximally meets the needs of users.
- Strong anti-interference ability: It adopts high-performance micro-processing full digital control, with reliable operation and strong anti-interference ability.
- Human-machine interface: It is composed of a simple keyboard with a 128*64 dot matrix Chinese character LCD liquid crystal display module, 3 signal indicator lights, and 6 keys. The data display is intuitive, and the operation is convenient.
- Multiple starting modes: There are five starting modes in total, including voltage ramp starting, ramp current limiting starting, pulse jog starting, constant voltage starting, and inching. It is suitable for various types of loads, and the starting process is smooth. The starting time can be adjusted according to the working conditions. Ramp current limiting and constant voltage starting are suitable for the no-load and light-load starting of the motor; voltage ramp starting is suitable for the heavy-load starting of the motor; if the static friction of the mechanical load of the motor is large, the pulse jog starting mode should be selected; the inching mode is used to check the forward and reverse rotation of the motor.
- Multiple parking modes: It has two parking modes, free parking and soft parking. The soft parking characteristics can meet the mechanical requirements in different situations, and the soft parking time and soft stop voltage can be set.
- Protection and monitoring: It has protection functions such as overvoltage, undervoltage, input phase loss, output phase loss, current imbalance, starting overcurrent, running overcurrent, overcurrent inverse time limit, overheating, external fault, starting time out, communication fault, and parameter error, making the motor more reliable and safe during starting and operation. After the fault protection, the fault action value can be queried, which is convenient for users to analyze.
- Communication function: It has a DCS remote control interface and a standard RS485 communication interface.
- Analog output: 4～20mA standard analog current output.
- Installation method: The product has a compact and novel structure, small volume, and is very convenient for installation, use, and maintenance.
- Reduce the starting current of the motor, alleviate the peak current of the power supply, and reduce the cost of power distribution equipment.
- Reduce the power distribution capacity and avoid the investment in capacity expansion.
- Reduce the starting mechanical stress and extend the service life of the motor and related equipment.
- The starting parameters can be adjusted according to the load, which is easy to improve the process and protect the equipment.
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