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Soft Start of Single Phase Pump Motor
Model: 463    

Solderable DIY project kit for Engineering & Diploma students

Product of choice for Engineering & Diploma students worldwide.

Do-It-Yourself Kit


Rs. 5,399

Rs. 3,240

Includes complete hardware with plain PCB and a pre-programmed controller for building the project. Extensive documentation for project execution including step-by-step instructions for Circuit building, Assembly procedure and Troubleshooting. Thorough understanding from the Problem definition to Circuit Design to Programming, Testing, Troubleshooting and finally building a working hardware project.

Tool Kit


Rs. 0

Includes Digital Multimeter, Soldering Iron, Screw driver, Cutter, to be used with Do-It-Yourself Kit to build the project.

Loaded and Tested PCB


Rs. 0

Pre-soldered and tested PCB. Choose this option only if you are short on time. Only works along with the Do-It-Yourself Kit.

Total Rs. 0

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The main intention of this project is to provide protection for a single-phase pump motor by applying initial voltage gradually from low to high for obtaining  soft start. The pump motor draws more current than its rated capacity during their starting condition which may lead to the damage of the windings of the motor. In order to avoid this problem, applied voltage is gradually increased from low to high so that the soft start of the pump motor is performed.


This project consists of  two anti-parallel SCRs connected in series with an induction motor to the supply. The time to  start the firing angle is heavily delayed by receiving delayed pulses from the operational amplifier.

The op-amp operates in comparator mode that compares to zero voltage pulses to develop a sawtooth voltage which is further compared against a varying voltage by charging and discharging of a capacitor to develop delayed pulses for triggering the SCRs.

A lamp is provided in this project in place of an induction motor for demonstration purpose.However a motor of 0.25 HP ( not supplied by us) can be used.


Furthermore, the project can be enhanced by using six SCRs: two connected back to back for each phase.  

Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Analog Soft Start Induction Motor.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
Non-Microcontroller Project.
Soft Start of Single Phase Pump Motor
Hardware Requirements
  • Op-amp
  • Opto-isolators
  • SCRs
  • Voltage Regulator
  • Transformer
  • Diodes
  • LED
  • Resistors
  • Capacitors
  • Lamp
Software Requirements
Q & A
Q:  What is soft start?
A:  Soft Start means gradually increasing the supply voltage to the motor
Q:  Why bulb is used instead of motor?
A:  In order to visualize the soft start it is better to use a bulb
Q:  Can we use motor instead of bulb?
A:  Yes, Motor of rating ¼HP, 230V can be used.
Q:  Does this project have a pre-programmed microcontroller?
A:  No, it is a non-microcontroller based project
Average Rating
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Showing 2 of 2 reviews
Moulica, Hyderabad on 2nd June, 2015, 12:20 PM

I came to know about Edgefx through my friends and even my classmates had taken the project from Edgefx.I decided to buy a kit due to my friends and class mates had taken the project from Edgefx. I like the complete kit.Yes the kit delivered on time with the right components.Yes I would like to mention Mr. Mohan because when we approached to office he takes care of us. The Resale should be implemented.

Anantha krishna, Banglore on 30th May, 2015, 04:38 PM

Yes the kit delivered on time with the right components.Yes Edgefx technical team is good.It’s fine and circuit diagram is very helpful at the time of building.Yes I recommend Edgefx to my friends.

Rating Breakdown (2 Reviews)

Only Tool kit can not be purchased individually.


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Telangana, India
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