What are the functions and effects of the soft start cabinet?

The soft start cabinet is an electrical device used for motor starting. It controls the voltage and current during the motor starting process to achieve smooth starting of the motor, reduce the current shock and mechanical shock during the starting process, extend the service life of the motor, and improve the reliability and stability of the system. This article will introduce the role, function, working principle, application field, selection and use precautions of the soft start cabinet in detail.

1. The function of soft start cabinet

1. Reduce starting current surge

When the motor starts, the current will instantly reach several times the rated current, causing a great impact on the power grid and the motor itself. The soft start cabinet controls the voltage and current during the starting process, so that the current of the motor starts gradually increases, thereby reducing the starting current impact.

1. Reduce mechanical shock

When the motor starts, the sudden change of current will cause a sudden change of torque on the motor shaft, thus generating mechanical shock. The soft start cabinet controls the torque during the starting process, so that the torque of the motor gradually increases when starting, thereby reducing mechanical shock.

1. Extend motor life

Since the soft start cabinet can reduce the current shock and mechanical shock during the startup process, it can extend the service life of the motor and reduce maintenance costs.

1. Improve system reliability and stability

The soft start cabinet can reduce the current shock and mechanical shock during motor starting, thereby improving the reliability and stability of the entire system.

2. Function of soft start cabinet

1. Soft start function

The core function of the soft start cabinet is to realize the soft start of the motor, that is, during the motor starting process, by controlling the voltage and current, the motor starting process is made smoother.

1. Soft stop function

The soft start cabinet can not only realize soft starting, but also soft stopping. During the motor stopping process, the soft start cabinet controls the voltage and current to make the motor stopping process smoother.

1. Overload protection function

The soft start cabinet has an overload protection function. When an abnormal situation occurs during the operation of the motor, such as overload, overheating, etc., the soft start cabinet can cut off the power supply in time to protect the motor and system safety.

1. Short circuit protection function

The soft start cabinet has a short-circuit protection function. When a short circuit occurs in the motor or line, the soft start cabinet can quickly cut off the power supply to avoid damage to the motor and line.

1. Fault diagnosis function

The soft start cabinet has a fault diagnosis function, which can monitor the operating status of the motor and system in real time. When an abnormal situation occurs, it can promptly alarm and display fault information, making it convenient for users to troubleshoot and handle the fault.

1. Communication Function

The soft start cabinet has a communication function and can communicate with host computers, PLCs and other equipment to achieve remote monitoring and control.

3. Working principle of soft start cabinet

The working principle of the soft start cabinet is mainly to control the voltage and current during the motor starting process by controlling the conduction and shutdown of the thyristor. Specifically, the working principle of the soft start cabinet can be divided into the following steps:

1. Start-up preparation phase

Before starting, the soft start cabinet will perform some preparatory work, such as detecting the status of the motor and circuit, setting the starting parameters, etc.

1. Start-up phase

During the startup phase, the soft start cabinet controls the on and off of the thyristor to gradually increase the voltage and current of the motor to achieve soft starting.

1. Operational stage

During the operation phase, the soft starter cabinet will monitor the operating status of the motor and system in real time, such as current, voltage, temperature, etc., and make adjustments as needed.

1. Stop phase

During the stopping stage, the soft start cabinet controls the on and off of the thyristor to gradually reduce the voltage and current of the motor to achieve soft stopping.

4. Application fields of soft starter cabinet

Soft start cabinets are widely used in various industrial fields, such as electricity, petroleum, chemical industry, metallurgy, mining, construction, water treatment, etc. Specific application scenarios include:

1. Pump equipment

The soft start cabinet can be used to start various pump equipment, such as water pumps, oil pumps, chemical pumps, etc.

1. Fan equipment

The soft start cabinet can be used to start various fan equipment, such as centrifugal fans, axial flow fans, blowers, etc.

1. Compressor equipment

Soft start cabinets can be used to start various compressor equipment, such as air compressors, refrigeration compressors, etc.

1. Conveying equipment

The soft start cabinet can be used to start various conveying equipment, such as belt conveyors, bucket elevators, etc.

1. Mixing equipment

The soft start cabinet can be used to start various mixing equipment, such as mixers, mixers, etc.

5. Selection and use of soft start cabinet

1. Selection considerations

When choosing a soft starter cabinet, you need to consider the following aspects:

(1) Motor power: The rated power of the soft starter cabinet should match the power of the motor.

(2) Starting method: Select the appropriate starting method according to the actual application scenario, such as star-delta starting, autotransformer starting, etc.

(3) Control method: Select the appropriate control method according to actual needs, such as manual control, automatic control, remote control, etc.

(4) Protection function: Select appropriate protection function according to actual needs, such as overload protection, short circuit protection, phase loss protection, etc.