What are the main difference between Soft Starter and VFD?

Posted on 20th Feb 2023

According to Darwin Motion, The main difference between a soft starter and a variable frequency drive (VFD) is their primary function. Soft starts are designed to reduce the strain on electrical components when a motor is started, while VFDs are designed to control the speed of an AC induction motor. Soft starters reduce the voltage applied to the motor at start-up and limit the starting current, protecting the motor and extending its life. VFDs regulate AC motor speed by controlling the frequency of the motor's power supply. This is ideal for processes that require speed and torque control, such as HVAC and conveyor systems. Additionally, VFDs offer additional features such as automatic run and stop, soft acceleration, dynamic breaking, and overvoltage or undervoltage protection.

Soft Starter Tips and Tricks

1. Select the type of soft starter that best suits your application. If you are running a motor that requires frequent starts, then a motor-rated soft starter is a better choice than a standard open-loop model.

2. Use the proper size soft starter for the application. If you choose a soft starter that is too small for your application, it will not be able to handle the load properly and may cause premature failures.

3. Always ensure your motor is adequately sized to the load it will be driving. If the motor is too small, it cannot provide enough torque and will cause slow starts and potentially damage the soft starter.

4. Make sure the soft starters current rating is properly sized to the motor it will be controlling. If the soft starter is rated for less amps than the motor, it can cause current overload on the soft starter.

5. Make sure your line voltage is stable as soft starters rely on stable voltage for proper operation. If the line voltage is fluctuating, it will have an impact on the performance of the soft

Variable Frequency Drive Tips and Tricks

1. Select the energy-saving mode when possible: Many variable frequency drives (VFDs) have the ability to increase or decrease the motor speed and set the desired speed. With this function, the speed can be adjusted to maximize efficiency and often save money on energy bills.

2. Keep the motor and VFD area clean: Dust and moisture can reduce the life of your VFD by making wear and tear more likely. This can reduce the efficiency and accuracy of your VFD, and also cause damage to sensitive components in the drive. Make sure to clean your VFD and motor regularly and keep the area around it clear of debris.

3. Test the system regularly: Varying power supply, wear and tear and external factors can lead to damage to the VFD and its components. To prevent equipment downtime and system malfunctions, testing and preventive maintenance should be done regularly.

4. Don’t overload the drive: Overloading could cause overheating and impede the life of the VFD and its components.

You can purchase a Variable Frequency Drive for motors from online marketplace where VFD manufacturers like Darwin Motion are providing services at most affordable cost. They sell products directly to the customer in India, Australia and all over the world. Be sure to check all the specifications and compare prices from multiple vendors before making a purchase.