Belt conveyor is widely applied in mining, cement, ports, power plants and other heavy-duty industrial places. Direct across-the-line starting of the conveyor motor creates a sudden torque impact which can lead to belt tension, material spillage, mechanical shock or even protection trips.
A soft starter for belt conveyor may be a practical motor starting solution for conveyor systems that do not require continuous speed regulation. It helps the motor to accelerate smoothly and reduces the stress on the belt, gearbox, coupling and driven equipment.
1. Why Belt Conveyors Need Smooth Starting
A belt conveyor is used to carry heavy loads. At start-up the motor has to overcome static friction, the inertia of the belt and the resistance of the load. If the motor starts too abruptly, the belt may jump, stretch or shake.
This may cause belt wear, coupling stress, gearbox impact, material spill, unstable start-up and higher maintenance cost.
In some industrial plants, the high starting current may also cause voltage drops or affect other electrical equipment. That is why many buyers look for a smoother motor starting method other than direct online starting.
2. How a Soft Starter Helps Conveyor Systems
A soft starter slowly raises the voltage to the motor. It does n't just instantly apply full voltage , it lets the motor accelerate step by step .
For belt conveyor applications, this smoother acceleration can help to minimise mechanical shock and improve start-up stability. It can also reduce the effect on the power supply system by limiting the starting current.
Soft starters do not offer continuous speed control like a VFD would. However, if a conveyor only requires a soft start, and then runs at a set speed, a soft starter could be a less expensive alternative.
3. RENLE Soft Starter Solutions for Conveyor Motor
RENLE offers soft starter solutions for low-voltage and medium-voltage industrial motor starting applications. The soft starter for belt conveyor can be selected according to the motor voltage, rated current, conveyor load condition, starting frequency and site environment.
Soft starters on low voltage are used to reduce the starting current of low voltage conveyor motors and to provide smooth acceleration. For larger conveyor systems in mining, cement or power plants, a medium-voltage soft starter may be required for higher motor voltage and heavier starting conditions.
The right configuration depends on whether the conveyor starts unloaded or fully loaded, how often it starts and if the site requires a bypass cabinet, protection functions or a communication interface.
4. What buyers should look for before buying
Before selecting a soft starter for belt conveyor, the buyer should provide the motor power, voltage, rated current and the conveyor load condition.
The key information contains motor rated current, conveyor length, load condition, starting frequency, starting time, working hours, ambient temperature and cabinet installation environment.
Also the cabinet cooling and protection should be considered in case that the conveyor is often started or working on a dusty site.
For soft starter for belt conveyor, please send us your motor nameplate, conveyor load condition and site environment. RENLE engineers can help you to confirm the right soft starter set-up for your project.
