What is the Purpose of the Main Switch?

[@elninorosario]

1:30 small correction transformers are used to convert high volt AC to low volt AC which can then be rectified to obtain DC voltage. .

[@gassanali8667]

Good point there! Transformers are used to step-up or step-down AC voltage.

[@eliosgreek8028]

Not necessary ! Either step up or down.

[@elninorosario]

@@eliosgreek8028 you are correct they are used in microwave to step uo

[@smith549371]

Actually these devices are normally described as "PSU's" or power supply units and contain converters that include components that transform and rectify the AC to the desired DC voltage.

[@rafaelgarciasanchez4420]

I really appreciate all of your technical support and information. Keep It that way, clear, complete and understable. Thanks again. Hope to hear about you pretty soon.

[@realpars]

Hi Rafael, Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@rafaelgarciasanchez4420]

@@realpars You are welcome my buddie ! Keep it Up !!!!

[@rafaelgarciasanchez4420]

Hi everybody, I want to take the time to widly recommend to our Friends of RealPars, they are a great team of profesional people. They posses a wide technical knowledge and skills, we can learn about and increase our profesional growing. I invite to each one of us to enjoy each of their videos. Enjoy your learning way yo thu succes.

[@hariprasadmuraleedharan437]

Thanks a lot guys for your Excellent videos Definitely you guys are like mentors for Beginners in the Automation industry As a begineer I convey my sincere gratitude to you guys and look foreward to get in touch with you as early as possible

[@realpars]

Hey Hariprasad! Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@aaronchristensen1810]

Even when the main switch is off, the wires that come from the supply (the wall) will still be energized, correct? So it’s important to note that even with the switch off, there are still 4 live wires inside the control box. Is this correct?

[@realpars]

Correct. Only the downstream wires are volt-free. This would be be true for any disconnecting means within a panel. It is very important to know how a panel is constructed prior to doing any work inside the panel.

[@smith549371]

This is indicated in this panel by the orange cabling for "maintained" supplies that aren't isolated with the normal means of isolation. Having 415v AC on your door is not good practice though, you can get rotary isolator switches that mount on the backplate inside the panel and use a square rod to mechanically connect them to the switch on the door which also prevents the door from being opened when energised. The safest way though, is to have the rotary isolator mounted external and only have the output cabling enter the panel.

[@kacek819]

I noticed green-yellow wire coming to the -V connnection of 12V and 24V DC power supplies. Is it a prtocetion ground wire? Is connecting -V to ground a thing that should be done generally, something specific to that particular power supply or something else?

[@Tavle]

Kacek It is called PELV, without PE it is SELV. Some components require PELV and I always make PELV.

[@realpars]

In Dan Jensen's comment to your post, he indicated his use of PELV for this function (Protected Extra Low Voltage). This is the same function as you are describing being connected to -V of the power supplies. That is one of the normal designations on power supplies to represent the common for the supply. The green-yellow wire is tyically connected to a low-resistance grounding connection, which provides protection against electrical faults.

[@LMchange-z3z]

Thanks real pars team

[@realpars]

You are very welcome!

[@amjadhelo3598]

big thanks to Realpars team very useful video iam very keen to learn about the protection device and cable cross section calculation thank you for the great effort

[@realpars]

Great to hear that! Thanks for your comment.

[@MohammedHussain-cc5hl]

Thank you for giving this video.

[@realpars]

You are welcome, Mohammed!

[@amyth_dev]

Hi, thanks for the time you put in these videos, You are the best source for learning industrial automation on KZbin... If you get the time please provide some information about what software would you suggest for creating control panel designs.

[@realpars]

There are many that are used, and here are a few: EPLAN (Rockwell), eVolve (AutoDesk), and PanelDraw (Hoffman). There are may others, including using object libraries from the major CAD software providers.

[@Jaescompany]

Nice video congratulations

[@realpars]

Thanks a lot, Jaes!

[@derekhypes7520]

Thanks for the clear, concise video.

[@realpars]

You are very welcome, Derek!

[@hl-qz1ec]

What is the function of the distribution unit? I assume it takes the function of main circuit breaker and surge arrester?

[@realpars]

A power distribution block is used to create individual circuits using terminal blocks commensurate with the wire sizes appropriate for the circuit load. It would be very difficult to "stuff" multiple wires into the main power lug. That would not guarantee a good connection of the multiple conductors. Using a distribution block will help guarantee good connections with properly-sized terminals.

[@geliasr2562]

1 - A three phase 415VAC will give me a one fase 240Vac. 2 - What's the pourpose of the contactor between the two distribution unit? 3 - Is that usual the main three phase cables pass through a switch assembled on the front door? Cound't be just a command switch?

[@realpars]

The incoming 415VAC power is fed by fairly small feeder wires and appears to be #10AWG (5.26mm2) at the most, or 12-15 amps ampacity. In this case, a simple rotary switch as shown is sufficient to disconnect power to the panel. The contactors are used to switch on/off power internally in the cabinet based on other signals, such as PLC outputs, hardwired logic, etc. These additional details were not covered in the video. Also, it appears that this panel was built according to IEC standards, so a panel in the US or other countries may require a different design to comply with local codes.

[@amolkirad3185]

Good work guys keep it up...

[@realpars]

Thanks a lot, Amol!

[@andreaskradolfer1809]

Thank you for the nice Video. Is it possible to make a video about the diffrent fuses in a control panel and the cabel cross-section?

[@realpars]

Hey Andreas! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@samurock100]

Keep the content coming guys. Enjoy your videos.

[@realpars]

Great to hear that! Thanks for your support!

[@arifchannachannel]

GOOD DETAILS FOR DC

[@cheyguvera9680]

hi there I wanna learn plc programming. what is the course duration and do all the plcs have same programming procedure?

[@rain0aldwaib]

their courses focused more on Siemens although they have few videos about other plcs also they publish a a new video every like 10 days i have been subscribed with them for almost a year and i think it is worth if you can afford it

[@realpars]

Hi Chey! Thanks for your comment! Great to hear your motivation! Our courses are completely flexible, meaning, you can join on a monthly or yearly subscription package which grants you access to our full course library (400+ video courses). Therefore, the course duration all depends on the time you have available to go through the course material. Every Friday, a new course video will go live on our course library. Feel free to browse through our course library to see all the different topics we are covering. bit.ly/30AVJaR If you have any other questions or would like any further assistance, please feel free to reach back out or email us at [e-mail] Happy learning!

[@mnada72]

4:52 I think this is not 3 phase distribution, It should be single phase ! even if it's taken from 3 phase. I can see only 2 tb + earth and I think mixing the distribution from 3 phase in the panel is dangerous.

[@karimsh4281]

Please Talk about emergency relay with plc

[@realpars]

Hi Karim! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@yengchienwong7284]

Refreshing and helpful ;D

[@realpars]

Great!

[@AbcDef-hl2ic]

Great videos. But I'm surprised that you are distributing power without protecting each circuit (from transformers to each outer devices). They are clearly not the same power and don't have the same wire thickness so they cannot rely on the previous breaker to protect them.

[@realpars]

Yes, normally each branch circuit would be protected with a breaker or fuse. This protection can be added inside the panel or at the device. Control panels are typically built to the spec of the end user, so there may be differences in how this is done in your plant and what is shown here.

[@rabahboussada6960]

Thank you for the video

[@realpars]

You are welcome, Rabah! Happy learning!

[@shakeelahmedmughal894]

Good video

[@realpars]

Thank you, Shakeel

[@derina.maleek9408]

Thanks.. I'm tune

[@realpars]

You are very welcome, Derin!

[@bilimasterdong6915]

good video

[@realpars]

Thank you!

[@sayednabil417]

Thanks

[@realpars]

You are very welcome, Sayed!

[@PoSwojemu]

Where is the safety function ??. Why you dont tell does you can or not switch under load with it etc... Why it has only 4 pole not 5 ...

[@realpars]

First, this panel would fall under EU guidelines, namely EU Guideline 89/655. The switch shown can be switched under load up to it rated amp value, which, based on the wire size, is probably not more than 10A. Second, it does not appear that there is a lock-out mechanism for the feed circuit, which technically meets EU Guideline 89/655 for disconnecting a panel from operation. Third, the power feed has 3 phases and a neutral, hence, four poles. I would suspect that neutral and ground are bonded at the transformer. This is not the typical arrangement in the US and it would not meet US OSHA requirements.

[@ucduongat5276]

thanks you a lot. from viet nam

[@realpars]

You're more than welcome!

[@تكلمبالعربية_وهران]

You are great

[@realpars]

Thanks a lot, Abdo!

[@abdullahafifi4231]

♥️♥️

[@vipinvv9887]

good

[@realpars]

Thank you, Vipin!

[@abdessamedghettas7167]

Thanks