Q: What is induction motor protection?
A: Protecting the Induction motor from single phasing and over-temperature is known as induction motor protection.
Q: What is the rating of motor used in this project?
A: A 3 phase, ¼ HP motor is used in this project.
Q: Is single phasing protection available?
A: Yes, single phasing protection is available.
Q: Why are 6 lamps used?
A: A series of two lamps are used to represent each phase. 2 lamps are connected in series to ensure safety.
Q: What is the three phase induction motor rating to be used?
A: Three phase induction motor can be used, but limited up to 1 HP only as it uses a relay of 6A contact rating only. For higher HP just use a contactor of appropriate rating. The 230 AC coil of the contactor is powered in series from one of the contacts of the relay.
Q: What is the formula for calculating smoothing capacitor value?
A: There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
Q: What to do when the lamp fails and what is the maximum lamp rating that can be used?
A: If the lamp fails one can use any lamp or bulb which is used in homes up to 100W. We suggest you to go for low watt bulbs.
Q: In this project six bulbs are used but i want to use 3 phase induction motor instead. Is it possible? If yes then what will be the rating of that motor and what will be the cost?
A: You can use a three phase induction motor but limited up to 1 HP only as it uses a 3CO relay of 6 A rating only. For higher HP just use a contactor of appropriate rating the coil of which is driven by the relay on board.