Soft start how does it work

What is a soft starter, application, and working principle pdf Soft Starters are starting devices, used for the acceleration, deceleration, and protection of the three phase electrical induction motors through the controlling applied voltage to 3 phase motor.

Induction motor is the most frequently used motor for industrial as well as domestic applications. Ac motor is become most popular because of its simple and robust construction, low maintenance and can be suitable for any working condition. Due to its numerous applications, the induction motor needs some starting arrangements to start softly and safely. Various starting methods are used to start induction motors like star delta starter , DOL starter , auto transformer starter , soft starter , and VFD.

In this article we are going to discuss Soft starter for three phase induction motor, soft starter circuit, soft starter working, application, advantages, block, power, control diagram, working principle, uses. Soft Starter is another form of reduced voltage starter use for starting 3 phase induction motor. Soft Starter also called a Solid-State controller. Soft Starter does not change frequency as VFD. Instead it Ramp up voltage level applied to motor from initial value to full voltage.

Initially applied voltage is low which is only to overcome gear wheels or stretching driving belts etc. Either way, this flexibility and customizability is an enormous advantage. It takes a lot of energy for a motor to power up conventionally. This means that, depending on the machine, it may not be able to power up an excessive number of times within a particular hour.

The large surge of energy associated with a conventional startup can sometimes cause a motor to overheat. This overheating can be harmless, but it can also lead to the motor shutting down temporarily and it can even cause lasting damage to the motor. It should go without saying that a soft start does not involve this initial blast of power. Instead, a gentle surge of electricity is supplied to the motor, resulting in a greatly reduced risk of overheating.

Conventional startups can work perfectly fine sometimes. Other times, however, they can cause problems. The motor might overheat. The machine might malfunction. There might be a power surge. Because the risk of these problems is removed or greatly reduced with a soft start, your machine will be able to operate more efficiently and with less risk of problems and damage.

Anything might happen and damage might occur at any time. A VFD has some similarities to a soft starter, but there are enough differences to put it in a class of its own. This means it can control how fast the motor is running during both the start and stop cycles, as well as during the ordinary run cycle. Both have a way of controlling the amount of power running through a motor while it is starting up and both can help prevent things like power surges and issues during startup.

They differ, however, regarding the method they employ to achieve this goal. A VFD is usually preferred if your main goal is to save energy. It can also help you control the speed during the ordinary running cycle as well as during the power-down phase.

Applications like elevators and escalators fit this description. In applications like these, you will be able to control the constant speed of these pieces of equipment and prevent them from experiencing any unexpected surges in power.

Now that we have learned about how an electronic soft start system works, let us recollect a few reasons why it is preferred over other methods. Can u send me connection diagram of this circuit.. Can u help me in my project..? My project is soft start single phase induction motor…Plz. Hi Amaan mansuri once you purchase the project from our website then only we provide you with all documents, circuit diagram, source code, and AV tutorials For any assistance or for customization of projects please email us on team elprocus.

Compounding Excitation Transformer 3. Hi every one, Can we assume that soft starters will eventually lead to power saving if installed on air conditioning system? Power consumption in hot climate areas like Saudi Arabia is a major concern to everyone and I thought soft starter can help in power saving. Appreciate your feedback. Hi Sameer K. For any assistance or for customization of projects please email us on team elprocus. Hi Sairahul, As per the telephonic conversation,already you have been discussed with our technical team and also you are ready to come for our office within few days for knowing the more information regarding the project.

Also knowing the maximum imbalance between phases will help keep the system within working parameters. Finally, having some kind of data logging for recording fault records can help with troubleshooting during maintenance as well. The method of mounting soft starters is important, as their ability to cool depends on their orientation. Most soft starters will come with recommendations for how and where the starter should be mounted e. The dimensions are also important, as there must be enough space for the soft starter along with sufficient room for it to remain cool.

Soft starters are best used in applications that need a slow starting but powerful motor. They are commonly found in applications such as building air filters, where a motor must power a large fan.

If a soft starter was not used in this case, the fan would start at high speeds and reduce the effectiveness of the filtering as well as potentially damage the motor by running a high inertial load. Similarly, soft starters find uses in water supply systems where water must be slowly pumped to prevent pressure buildup. Finally, conveyors systems benefit from soft starters, as they must accelerate items from rest without jerking or they risk items falling off the belt.

Soft starters are also popular upgrades for older reduced voltage starters , as they are more controllable, programmable, and efficient. Soft starters provide smooth, step-less acceleration of current-hungry motors that may otherwise stress their power systems.