Might be worth going in to the motor overload also and the settings depending if it is positioned inside the delta loop or not - Type 1 or Type 2 coordination. Good video. 👍
This used to be a mechanical switch. - The first position was 0 = switched off. - The second position was Star. The switch had to operate in this position for a certain period of time. - The third position was Delta. This is where the engine has the most power. But switching from star to delta too quickly throws out the fuse. Later a mechanical or electronic delay was added.
Great video but definitely shouldn't be used as a reference video since nothing was mentioned on the having to have the timer wired through the opposing normally closed contactor, that way if the timer fails or the contactor welds closed its impossible for the other contactor to be energised, and not crossing phases.
Might be worth adding that the star & delta should be interlocked (Electrically/mechanically... or both) to avoid the star and delta contactors energising at the same time..... or bad things happen 😮
I thought SD starters went out with the ARC. Why run 6 cables when you can run 3 and a soft start, then also you don’t have to worry about someone setting the transition timer too low and having large inrush current.
A star-delta starter can give higher starting torque than a soft-starter. A soft-starter which limits the starting current to 1/3 normal starting current will reduce the torque by a factor of x 9, whereas star-delta will reduce it by x 3. It depends what the load is like in terms of inertia and torque requirements. Soft-starter has the benefit of more sophisticated motor monitoring and protection.
Well yes and no, having used some small soft starts to replace SD starters I am less than impressed with the starting torque. Poor motor makes a horrible noise at start up as the soft start just appears to chop two phases from what I can see. ( bigger KW soft starts control all three phases and give a better start up. Given the low price of inverters now this is a good option if speed control would be useful.
@@efixx Thank You so much for the kind reply Hi is there any training which I can attend currently I am based in Lisbon Portugal and I am fallowing E fix from the last 5 years Btw I am an Electrical Engineer Let me know If there is any online training or certifications like BS7671 Standards
You need an 80 ms delay when switching from star to delta because the magnetic field from the star setup has to dissipate before the delta connection is introduced. The term 'very quickly' is nonsense in electrical terminology; only use ms or s.
@@efixx If you don't need speed control once running, a star-delta starter can also be much more compact in panel real estate. I can start a 37kW motor with contactors occupying ~200x200mm in the panel, a 37kW inverter will be twice that size at least.
That's like stating you only buy pre-formed bends for trunking, tray etc... yes we all do it but if you were properly trained you'd be taught how to construct one by hand - know your basic craft skills!
That’s brilliant…..I’m a service engineer that looks after air compressors and this has been really helpful in understanding the Star/Delta process..
Brilliant news, so glad that it helped!
Might be worth going in to the motor overload also and the settings depending if it is positioned inside the delta loop or not - Type 1 or Type 2 coordination. Good video. 👍
Great tips for future content, thanks much! 😃
This used to be a mechanical switch.
- The first position was 0 = switched off.
- The second position was Star. The switch had to operate in this position for a certain period of time.
- The third position was Delta. This is where the engine has the most power.
But switching from star to delta too quickly throws out the fuse. Later a mechanical or electronic delay was added.
Great video but definitely shouldn't be used as a reference video since nothing was mentioned on the having to have the timer wired through the opposing normally closed contactor, that way if the timer fails or the contactor welds closed its impossible for the other contactor to be energised, and not crossing phases.
Great point, this is just the starting point for motor control content on our channel, watch this space...
Not a bad little video gentleman - there are lots of motors a lot bigger than 5kw which start DOL
Thanks sir
You're very welcome! 😊
Might be worth adding that the star & delta should be interlocked (Electrically/mechanically... or both) to avoid the star and delta contactors energising at the same time..... or bad things happen 😮
Great point for future content, thanks Eusty! 😃
Monitoring whether all three phases have energy should also be installed.
If one phase is missing, the motor cannot run properly.
I remember when you had a handle to change from star to delta.
Yes, worked on the Ellison oil filled type when I was an apprentice. 50 yrs back!
Ah nice, back before all this pesky automation! 😃
I thought SD starters went out with the ARC. Why run 6 cables when you can run 3 and a soft start, then also you don’t have to worry about someone setting the transition timer too low and having large inrush current.
SD is a lot more robust. What ever suits ultimately.
@@retrozmachine1189Exactly this! Seen plenty of sort starts stop working.
A star-delta starter can give higher starting torque than a soft-starter. A soft-starter which limits the starting current to 1/3 normal starting current will reduce the torque by a factor of x 9, whereas star-delta will reduce it by x 3. It depends what the load is like in terms of inertia and torque requirements. Soft-starter has the benefit of more sophisticated motor monitoring and protection.
Well yes and no, having used some small soft starts to replace SD starters I am less than impressed with the starting torque. Poor motor makes a horrible noise at start up as the soft start just appears to chop two phases from what I can see. ( bigger KW soft starts control all three phases and give a better start up. Given the low price of inverters now this is a good option if speed control would be useful.
Horses for courses really, and while Noah did not have a Star Delta starter on the ark, he did have electrical illumination... flood... lights... 😂
You look changed now in beard Boss hope you will be fine
Yes, the beard has been and gone now, might grow it back for the winter. 🤔
@@efixx Thank You so much for the kind reply
Hi is there any training which I can attend currently I am based in Lisbon Portugal
and I am fallowing E fix from the last 5 years
Btw I am an Electrical Engineer
Let me know If there is any online training or certifications like BS7671 Standards
You need an 80 ms delay when switching from star to delta because the magnetic field from the star setup has to dissipate before the delta connection is introduced. The term 'very quickly' is nonsense in electrical terminology; only use ms or s.
Don’t bother with star delta starters these days, control via an inverter, 21st century
Got to know how to do it properly before you learn how to cheat! 😃
@@efixx If you don't need speed control once running, a star-delta starter can also be much more compact in panel real estate.
I can start a 37kW motor with contactors occupying ~200x200mm in the panel, a 37kW inverter will be twice that size at least.
That's like stating you only buy pre-formed bends for trunking, tray etc... yes we all do it but if you were properly trained you'd be taught how to construct one by hand - know your basic craft skills!
Do you guys do anything unpaid? Even college connections is a hustle you make money from.
Gotta keep the lights on. 🤷