For a wound - rotor asynchronous motor, when the grid voltage and frequency remain constant, by connecting a starting resistor in the rotor circuit that decreases as the motor speed increases, on one hand, the starting current can be reduced, and on the other hand, a relatively large starting torque can be obtained throughout the process. The Simo Motor's SYQ8 series liquid resistance starting cabinet utilizes this principle for starting. It uses an aqueous solution of a special medium as the resistance. In a specially designed liquid resistance tank, electrodes are introduced as polar plates. After connecting the resistors in a star configuration, they are connected in series to the motor rotor circuit. When the starting cabinet receives the motor starting signal, a small - power servo motor drives the polar plates to move, changing their relative positions. This causes the liquid resistance (connected in series to the rotor circuit) to change steplessly from large to small. When the resistance reaches its minimum value, the short - circuit contact cabinet closes, directly short - circuiting the motor rotor star point, enabling the motor to start smoothly with low current and high torque.
- The cabinet body and the water tank adopt a fully enclosed structure with perfect sealing measures. This effectively prevents the electrolyte from evaporating too quickly, prolongs the service life of the starting cabinet, and significantly reduces the maintenance frequency.
- It is particularly suitable for long - term operation in arid and rainy - scarce climatic environments with an annual precipitation of less than 200 millimeters.
- It is equipped with a circulation pump and has a unique self - circulation cooling system, which allows the heat generated in the water tank to be quickly dissipated through the circulation system in a short time.
- It is especially suitable for applications where multiple consecutive starts are required within a certain period.
- It uses a worm gear and worm elevator as the transmission mechanism, which provides smooth, reliable, and noiseless transmission.
- Its starting performance is far superior to that of starting cabinets such as frequency - sensitive resistance cabinets, oil - immersed resistance cabinets, and cast - iron resistance cabinets.
- The starting current is small: less than 1.3 times the rated current of the motor.
- It can be started continuously 5 - 10 times.
- Smooth starting: There is no mechanical stress impact on the equipment, which can extend the service life of mechanical equipment and the motor.
- It can start at low voltage: A 6 - kV motor can start smoothly at 5.5 kV, and a 380 - V motor can start smoothly at 340 V.
- The cabinet has a well - made and reliable structure. All operations are automated, and it is convenient for installation and maintenance.
- Low - voltage switchgear and controlgear assemblies: GB7521.1 - 1997 IEC439 - 1:1992.
- SYQ type liquid resistance starting cabinet: Q/XWZ2 - 2000.
- Ambient air temperature: (- 25 to + 50) °C.
- Relative humidity: ≤ 90%.
- Altitude: ≤ 2000 meters.
- Installation location: There should be no significant shaking, impact, or vibration, and no corrosive gases.
- Installation inclination: ≤ 5%.
- Power supply requirements: Three - phase four - wire AC 380 V ± 10%, 10 A.
Note: If there are special usage conditions, please declare and negotiate with the manufacturer when ordering from Simo Motor.
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