ABB 1TNW040001R1014 Motor Starter

Basic functions

Starting function: It can control the starting process of the motor to avoid excessive current shock when the motor starts. There are usually multiple starting methods, such as direct starting, star-delta starting, soft starting, etc. The specific model may use one or a combination of several starting methods. For example, the soft starting method can gradually increase the input voltage of the motor to make the motor speed rise steadily and reduce the impact on the power grid and mechanical equipment.

Protection function:

Overload protection: Monitor the motor current. When the motor is overloaded, that is, the current exceeds the set overload current value, the starter will cut off the power supply of the motor after a certain period of time to prevent the motor from being damaged due to overheating.

Short circuit protection: When a short circuit occurs in the motor or its connecting line, causing a sharp increase in current, the starter will quickly cut off the circuit to protect the motor and other equipment from damage by short-circuit current.

Undervoltage protection: If the power supply voltage is lower than the set undervoltage value, the starter will stop the motor from running to avoid problems such as overload and overheating when the motor runs at low voltage.

Phase loss protection: Detect whether the three-phase power supply is phase-lost. If a phase loss is found, the motor power supply is cut off in time to prevent the motor from burning due to phase loss.

Working principle

If it is a soft starter type, its working principle is generally to adjust the input voltage and current of the motor by controlling the internal power electronic devices, such as thyristors. During the startup process, according to the set startup parameters, the conduction angle of the thyristor is gradually increased to make the input voltage and current of the motor rise steadily, thereby achieving soft starting. When the motor reaches the rated speed, the starter may bypass the thyristor and allow the motor to be directly connected to the power supply to run, so as to improve efficiency and reduce energy consumption.

Application scenario

Motor starters are widely used in various industrial and civil fields where it is necessary to control the start and operation of motors.

Industrial field: such as motor control of fans, water pumps, compressors, conveyor belts and other equipment in factories. For example, in chemical production, motors used to drive various material conveying pumps and ventilators; in steel mills, motors used to control cranes, rolling mills and other equipment.

Commercial and civil fields: Motor control of air conditioning systems, elevators, ventilation equipment, etc. in shopping malls, office buildings, hotels, etc. In the home, some large appliances such as air conditioners and refrigerators may also use motor starters to protect the motor and stabilize operation.