3 Phase Direct On Line Starter/ Explain with Circuit Diagram, DOL Direct online starter
Different starting methods are used to start 3 phase induction motor like star delta starter, autotransformer starter, variable frequency drive,soft starter,dol starter(direct online starter) because the Induction motor draws a large current at starting.
Direct On-Line is the simplest and cheapest method used for starting three-phase motor. Dol is used for up to 5 HP motor. dol starter is more popular due to the low price.
DOL starter connects the motor directly to supply without a reduction in supply voltage and applies full line voltage to 3 phase motor. this is the main disadvantage of dol starter.
A small HP motor can be started simply by plugging into the power supply. But large HP motor required a special unit called a motor starter.
Direct online starter for 3-phase induction motor contain parts like miniature circuit breaker (MCB) for motor protection purpose, overload relay, power contactor, fuse unit, start button, stop button.
Small size dol starter is operated manually but for larger HP motor, dol motor starter are operated using electromechanical contactor (relay) to switch motor ON and OFF.
DOL Motor Starter can be used, if a high starting current cannot cause an excessive voltage drop in the motor circuit.
The demerits of dol starter is that gives the highest possible current to motor. Which is 6 to 7 time of rated current of the motor.
Besides the DOL starter draws the starting current there also exists a current peak that can rise up to 14 times the rated current since the motor is not energized from the first moment when starting.
DOL starter control circuit diagram consist components like Main power contactor, start button, stop push button and overload relay is connected in series this circuit is called control circuit of dol motor starter. All controlling of starter are controlled by this circuit.
DOL starter power circuit diagram :
Direct Online starter power diagram has fuse unit, Main power contactor (K1), overload relay. Also, we can connect MCB for protection purpose in a direct On-Line motor starter.
Пікірлер: 37
You are a real electrical engineer. This is a very wonderful tutorial, go ahead and provide me with refrigerator repair techniques.
thanks for your nice teaching and i hope you will share more video with us. it is very clear video .
I will rate you excellent for this video. Well done you made me learn or the understand both the circuit diagram and the wiring diagram...
Wow! This is video very informative and the best tutorial on the topic for me so far. I really appreciate it. Thanks for sharing it with us.
the best explanation I have ever seen!! thank you very much
Video is good. Maybe make a continuation showing pilot indivator lamp connection
I really learnt a lot . The way you explain every step helps big time ..thank you so much . Continue what you doing
keep them coming my brother i learned alot from this channel
One of the best videos in it's kind
Without exaggeration The best tutorial Ever
VERY CLEAR VIDEO I HAVE EVER WATCH SOFAR
Valuable content Please upload more controlling videos❤
Good teaching skills
Muy valiosa tu explicación! Muchas gracias!
Thank you sir your video useful me
Good explain ☝️
More and More video plsss🎉
Thanks for sharing this with us
thank yuo for all yuor vido
Thank you so much for this step by step commands videos, can you do more commands for automatic transfer switch using contactors, relays, timers for automatic generator start and star delta, vfd etc
Can you provide more videos that related only for electrical control plz.
thank yuo ❤
Thanks
Help alott
👍
What software did you use to make the video and the voice over?
onhj my jobsite they use the neutral and hot swapped , dont know yet why but it works aside from that everything is the same
Great design. What is the name of the simulation program?
Nice explanation but it needs to be more visuals to understand step by step..
I need help i three lines and earth only where i am i going to get neutral for control circuit
The command wiring is confusing Can I connect the Neutral wire directly TO A2 And L3 to the A1 and the motor will still start?
Plis can you do all motor starters
Software use u please tell me
Sir what is the proper amp of magnetic contactor and over relay for 15kw induction motor
@ionutionut2311
4 ай бұрын
You would calculate the amps as 15000 / (√3 * 400 * 0.85), (power/√3 * voltage * efficiency) so about 22 amps, so a rating of 25 amps and a thermal protection relay similar to that rating.
The video was good and useful. Thank you I also have a KZread channel where I teach how to wire industrial electrical panels and also tips about industrial electricity.