How does the soft starter save energy How to choose its load

How does the soft starter save energy?

The motor is an inductive load, the current lags the voltage, and most electrical appliances belong to this category. In order to improve the power factor, a capacitive load must be used for compensation, and a capacitor or a synchronous motor must be used for compensation. Reducing the excitation current of the motor can also improve the power factor (HPS2 energy-saving function, reducing the voltage at light load, so that the excitation current is reduced, and the COS∮ is increased). Energy-saving operation mode: Lowering the voltage at light load reduces the excitation current, and the motor current is divided into active and reactive components (exciting components) to increase COS∮.

Energy-saving operation mode: When the motor load is light, the soft starter is in the state of selecting the energy-saving function, and the PF switch is hot dialed to the Y position. Under the action of current feedback, the soft starter automatically reduces the motor voltage. Reduce the excitation component of the motor current. Thereby improving the power factor of the motor (COS∮). (Most domestic soft starters do not have this function) This function cannot be realized in the contactor bypass state. The TPF switch provides two response times for energy-saving functions: normal and slow. Energy-saving operation mode: automatic energy-saving operation. (Normal and slow response speed) No-load energy saving 45%, load energy saving 15%.

How to choose the load of the soft starter?

1. If the load is a centrifugal pump (fire pump, sprinkler pump, water pump, etc.), you need to use the pump control function to reduce the occurrence of system water hammer caused by the impact of the liquid flow when starting and stopping, so you must use an optional pump The soft starter with control function, such as the under-load protection or phase reversal protection, is better;

2. If the load is a fan, use the soft start function to reduce belt wear and mechanical impact, and use the braking torque function when stopping;

3. The load is mixer, crusher, hoist, etc., using double slope start and preset low-speed operation to avoid mechanical damage;

4. The load is a conveying equipment, which can use soft start and preset low speed functions to realize smooth start and stop. Soft stop eliminates the anti-inertial impact of the drag system caused by free stop, and avoids product displacement and liquid overflow;

5. It has a communication port to realize network communication and remote control. If there is a computer networking requirement, pay attention to its degree of intelligence when choosing a soft starter, whether it has a microcomputer interface, whether the interface has a communication address and program, whether it can achieve communication control and fault self-diagnosis functions.