Don't leave your lift motor room unlocked!
ฝัง
- เผยแพร่เมื่อ 3 ต.ค. 2011
- ...else I'll explore it in the pursuit of my interest of lifts!
This is quite an old video. It was filmed back in 2011. Please take a look at some of my latest videos.
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For those who don't know me, I've been fascinated in lifts since I was young. It doesn't dominate my life LOL, but I'm particularly interested in the older "relay" and "light bulb" generation of lifts (before LEDs were invented).
Fascinating machines these! The beautiful "whooooop" noises and those greasy fan motors!
These were installed in about 1980. I remember the building going up although I was very young.
The PLC (programmable logic controller, as shown in vid) were fitted in 1995, so these controllers have had an upgrade. They were probably 100% relay controlled before 1995.
hing LEDs).
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A lot of people don't realize that IBM made elevator relays back in the day, not just office secretarial equipment.
I got reaaaaallly lucky. Started a traineeship as an IT tech support, after some time we moved to a new office, first day at the new office and guess what? The bloody lift motor room door was unlocked...interesting as fuck, to say the least. Turns out there were some guys working on the lifts that day, hence the door being unlocked.
Even better was that the door to access the highest floor's restricted area where they kept the airconditioning units, boiler room and all the other things an office building needed was unlocked as well! Only this time, they *never* bothered to lock it! The cherry on top of the cake is that there's a ladder leading up to the roof of the building, sometimes I just go on the roof during my lunch break to eat my lunch there. It's quite an amazing view of the city and the ocean, not to mention you can actually see the mountains waaaayyy off in the distance when days are clear. It's loud as hell in that room due to the aircon units but it just adds to the little adrenaline rush from doing something you're not supposed to do haha
One time I was on the roof a guy and a lady in the next building saw me, they must've been on a tea break or something...not surprisingly, they were wondering wtf I was doing up there, I just waved at them and they waved back lol
+edbo10 Wow, these are the times that you need a camera lol. I went into loads of motor rooms in the 90s and 2000s, but mobile phones that recorded "GOOD" video were only around from about 2008 onwards, so all of my old videos were either low quality or just photos (then I formatted the wrong HDD in error and lost most of these photos :( :(
:) :) :) :)
edbo10 swearing makes you seem pathetic because you don’t have enough legitimate info
@@WELLINGTON20 imagine caring so much about swearing that you have to project lol
@@WELLINGTON20 your taboo are irrelevant.
This is actually really great quality for a pre-2010 cell phone.
Exceptional quality for 2011. 1080p!!
@@LBSiUK nah, 2011 was not 2001
Back in the 1970s I worked in two old buildings that were being used as warehouses for a department store. Both buildings were built in 1920s and had the original wooden freight elevators / lifts. To operate we pulled the wooden cage door down and pulled a rope either up or down to turn on the lift. The rope had metal devices clamped to it that pulled the rope automatically to stop at the floor. The shaft had plaster walls and a workman had marked his initials in the wet plaster and the year 1924.
That is one old elevator, a two speed AC with what looks like a new controller. It stops on the brake it appears, which it should not do. Also the gears you were talking about are the worm gear and ring gear, but do exactly what you said. There also appear to be a few overlays, but it is hard to tell from the video exactly what has been modernized.
Thanks for your info Bob :)
I can't seem to find words for how amazing this video is!
+David Irwin (passacaglia28) wow thanks very much. I did this one ages ago now, check out some of my new ones :)
I do this stuff too, me and the Mrs were on the public observation deck of a very large TV tower, and they had left the fire exit open in a construction area, so up we went! Nothing like sitting on top of the world being screeched at by annoyed birds of prey who fly up there to feast on rodents! Very confusing to see mouse and rat skeletons that high off the ground, but the birds soon made it clear.
Leaving a Lift room unlocked generally is a code violation depending on the local.
Watching this video for no reason whatsoever except out of pure curiosity. Simple but fascinating for somebody who just likes to know how things work. Thanks for sharing!
Same
I've fixed quite a few of those PLC's. Nice to see one installed and working.
The reason there is a heater in the motor room is because it can get quite cold there in the winter, and at the end of the year is usually the time people do maintance on lifts. (Dont ask me why)
Derpster Games Do these motors have space heaters?
Agreed, maintenance personnel's comfort ranks first. Before a project is finalized, it's the last box checked before commissioning and sign off. Not once has a maintenance worker been left without the comfort of warmth before identifying, troubleshooting and ultimately fixing an upset condition. A room full of high fives for a job well done by those who are barely involved isn't complete unless the maintenance worker was warm and comfortable.
you're talking rubbish.
it's to prevent condensation in/around the electic panel
Aren't these the load dumps for braking the motors? Pretty sure that's what they are.
The heater in the motor room is to keep the hydraulic oil from changing state when it gets too cold, this can give you levelling issues when the lift gets to the desired floor
Very cool! Those motors do have a nice startup and deceleration sound.
I find it odd that they just leave the panels open and swinging in the breeze. In my industry that's not a good idea. Usually the panel staying closed helps to keep the relays and components clean.
Just a note: that last set of prints were the selector prints, which may well be that overlay that had the floor positions. The STD and STU are step up and step down switches, and the slowdowns and floor positions are pretty obvious. Pretty decent prints compared to some.
This video started me off watching this channel!
Thanks for showing the shaft. Nobody else does that.
WOW! this video reminds me of memories. It's been 3 years since I did not see it again !
I was 7 when I saw this video !
Ive been on youtube for nearly 10 years I think now. Amazing to hear people that were kids still watching:)
I’m 10
The little unit next to the PLC at 4:26 is a comms module that connects PLCs of the FX series to each other via RS485. Via a protocol called 'Melsec' you can then share part of the data registers between PLCs. That prevents two lifts going to the same floor on a landing call.
Typical of the official Tesco repair! Very informative video. Keep on filming Mr Matt!
hey thanks for the comment!
We've got some epic old machines in grotty shafts! Love it!
You know this video has aged 10 years and still one of the greatest mrmattandmrchay video, I've been watching this exact video the next year it was released and I absolutely love the fact how mrmattandmrchay's videos have the same kind of quality but with a higher detail and higher resolution video in 2021. Thank you for keeping your quality steady for the past 10 years and looking forward to see more content with the same quality in the future.
You're correct in that it really isn't a good idea for anyone to leave the lift room door unlocked. Although your interest is in learning, there might have been someone else who might have had something more nefarious in mind.
If I won the lottery, I'd spend my time creating a lift museum. I'd offer money to refurbish old lifts in buildings so that I could keep all the old systems to erect them at my museum. Not sure that I would have many visitors but it would be fun and keep me busy!
@TarzanAndConz Hiya. Yes, I didn't expect to find a PLC in this installation, although it was only fitted in 1995. This building dates back to the early 80s.
Finding an unlocked one, it 'about' 1 in 20 maybe? I don't check every one of them as it depends who i'm with (if anyone). This was was up an iron ladder and must be difficult to fasten while balancing on that ladder and the eng got lazy? That's fine with me! LOL
Who esle was getting that weird feeling in their stomach when he was looking down the shaft?
Your mum is the same
Fantastic video and very helpful as I went in the lifts today at York Racecourse and I knew what was helping to bring the lift up and down in the lift shaft as a result of watching your video while I was in the passenger car going between floors. Well done.
Many thanks Michael - glad you liked watching it! These lifts have now been modernised, so good I filmed them when I did. I find older lifts much more interesting.
It gave me goosebumps man
Hear that awesome sound!
Nice video!
The handles can be hard to turn by hand merely. Sometimes they come with a forked lever that goes on the handle. You turn it a quarter of a revolution, get a new grip, turn again etc. I did that once on a ca 1936 machine to raise the cabin a floor in an old building (museum to be).
As usual very comprehensive & Great Detail !
thanks for the comment. I've lost count of the number of motor rooms that I've entered. Alot of these were because we had our own equipment within these rooms, other times it's just been for personal interest (and of course for you lot on youtube!). Death from electrocution is a real risk in these places. I am an engineer by trade, been working with relays and stuff when I was 12 (I'm 40 now) so you have to understand the dangers before doing this kind of thing. Check out my other vids :)
I'm glad I watch his videos as it helps further my knowledge of the lift industry as currently I'm a lift engineers work mate and I'm currently working on modernising two lifts at the moment
+Aiden Wallis thanks for your comment. I know a lot about lifts but im no expert... just an enthusiast since I was a kid. I know a lot about the relay generation and understand the principles but im in no way claiming to be an expert :)
mrmattandmrchay I'm no way claiming to be an expert either as I'm new to the whole world of lifts and how they work also the different types of lifts etc
Thank you sir for this video.I'm from Bangladesh of Sigma Korea Lift at Khan brothers Equ- Build Ltd.❤️
Mostly I lock my lift motor rooms but on christmas day I leave 5 of them open and on new years eve I do the same for the other 5 rooms.
Nice video, thanks for sharing. I don't know if it's just me but I always get a nice tingle over the head when I'm fascinated to watch something but have no real understanding of it.
Awesome upload of elevator room. Thanks for sharing....
If your so interested in lifts why don't you contact lesters and ask to see their panels being built. They still make relay panels for the replacement market.
+Sam Hulbert Thanks for the message, but I'm really only into the really old lifts, from before LEDs were popular, so this would be from early 80s and before that.
Thanks for this vid and the quality. I love elevators too. By the way, I guess 3 persons were responsible for locking that motor room door!
Many Many Thanks for share tjis video on youtube.
This is so awesome.
+nfsking2000 thanks. I do get a mixture of comments on this video. Mot sure exactly why this one has been so successful. My other ones I think are better :)
Very cool motor room the resistors cabnet looked very tired
Thank You for you share this video
Still really neat elevators/lifts though even though they appeared to be slightly modernized the controller does look in really good shape
no wonder people say older ones are actually better than newer ones they were built really well back then even though in my opinion I do also like modern ones too even though they're certainly not as good as back in the day
I think for me there is only one criteria and that's noisy motors. That is why this and the Italy one are my favourite vids, as the motors are noisy! The additional item in this video is the old fan heater! Had not seen one for years until seeing this video.
The intro to this cracks me up. The song sounds very retro and the various brief shots of everything is quite funny.
Thank you very much for the help.
fascinating, i remember going to the elevator room on my building when i was little and daaamn i loved going there =P
I think I know where these are, awesome to finally see inside this machine room. The last few times I been where i think this is, the RH lift has had it's grills pulled across the door. I though tthey could be modernising it, but maybe it was just out of order.
The "Whooop" Sound Is The Good Part.
+Richard Black these lifts and motors are still there but they've been modernised a few years ago. The whoop no longer exists as the star-delta motor configuration (which helps make the whoop) has been replaced to a variable frequency drive. Its just not the same :(
Ok?
@@mrmattandmrchay I thought that you said that they had gone?
:) :) :) :) :) :)
Thanks for the video. I'm an elevator contractor. When I see obsolete, grungy equipment like this, all I can think of is the liability we incurr, being the service provider. I would rather see all the old stuff get sacked, and get modernized with state-of-the-art equipment. But yes, I do like the old OTIS machines and controls. They were an art unto themselves. But best put in a museum now!
thats very intresting ! thx 4 Uplodad :)
Nice video!
Unbelievably Horace Green and Co are still not only in business but still at that address.
+diecast jam Wow, I didn't know that. Then they have been going for many many years!
The reason I did a search on them was because obviously I thought they would be long gone too, along with the rest of our heavy industry. But no it appears they are still there and doing well if they figures I saw were in any way up to date, interestingly they don't have a website though, all the info I saw was from references to them from other business directory type websites. Great videos BTW, not something I had thought about much, in fact I can't even remember why I watched one, but you have me looking at lifts now. We have a Doppler installed by Clyde Valley Lift in work, just ridden in it up to my office 20 mins ago. The lady who announces the floors has a very strange accent which sounds like a cross between Lancashire and ever so slightly European, which is explained by the fact that Doppler are Greek. It was only installed about a year ago, you would have loved the old one, it was ancient and was only ever installed as a goods lift, but as more ppl started using the back door to get into work it got hammered and kept trapping ppl and braking down.
Unfortunately man, I think you have some old information. Horace Green and Co apparently went under about the same time as Bull Motors did. If you check street view, "Station Works, Cononley Ln, Keighley" - you'll see the Horace Green and Co sign, with a big "to let" banner over it. Unfortunately the chinese market and the influx of the MRL lift have left these companies to rot... and these "Trislot" motors are fantastic, Absolutely fantastic - at least Stannah had the sense to keep these motors installed, even although giving it a VF mod, eliminating any noise.
Check this... yeah, unfortunately they're long gone. :( www.rightmove.co.uk/developer/branch/Candelisa-Ltd/The-Motor-Works-188108.html
I have love to watch the motors in action
Worm-gear drive makes simple safety. If a worm drive is less than 50% efficient driving uphill, then it is less than 0% efficient driving downhill, meaning that power is required to move in either direction. If the motor stops, the elevator cannot move. No dependence on separate brakes that can fail. Such an elevator CAN NEVER run away due to failed brakes, like a lot of the elevator fails you can find here. (Note: I don't know the efficiencies of actual elevator gearboxes. They might be able to be backdriven; they might not. Just that 50% is the threshold that decides whether it is possible.)
(Any elevator CAN run away if it is rewired, unless there are interlocks to mechanically block vertical motion when the door is open. (I don't know whether anyone does that.))
+quaztron Interesting! Although I am informed that old Schindler lifts can run away (through the gearbox) due to the gearbox ratio and positioning of the worm drive, which is also interesting :) But, with a gearbox it's impossible for the lift to reach too high speed unless the wormdrive failed completely (it's like putting car in first gear then letting it run down a hill - the gearbox will create resistance)
•Drive < 50% efficient means the gearbox cannot be back-driven. That is safer, but it costs a bigger motor and uses more energy, which only heats up the worm drive. The elevator drive only accepts mechanical power, and never delivers mechanical power.
•Drive > 50% efficient means the gearbox CAN be back-driven. Efficiency means a smaller (cheaper) motor. But the drive always delivers some torque to the motor, ultimately requiring a brake. On half of trips, the drive returns mechanical energy to the motor, which must be gotten rid of, either by driving the motor to oppose the load, or by using the motor as a generator, which yield electrical energy, which must be gotten rid of, either by heating up resistors or pushing it into the mains (regeneration).
•Examples:
•If the gearbox is 60% efficient when driving, storing 1 unit of potential energy costs 1.667 units of work, and absorbing 1 unit of potential energy RETURNS 0.333 units of work.
•If the gearbox is 40% efficient when driving, storing 1 unit of potential energy costs 2.500 units of work, and absorbing 1 unit of potential energy COSTS ANOTHER 0.500 units of work.
•Earlier I made up "uphill" and "downhill" because I don't know elevator terminology or parameters:
•In the few videos I have seen, runaway elevators fall UP, which tells me that the counterweight is heavier than the car plus one passenger. So it doesn't seem right to refer to "lifting" a small payload, because the elevator is actually letting it rise or "fall up"; the work is being done by the heavier counterweight falling. Likewise the elevator doesn't "let" a small payload fall down; it has to push the car down, because it is also lifting the heavier counterweight.
•The counterweight must, at a minimum, cancel out the weight of the car. However, energy costs are minimized if the counterweight cancels out the weight of the car PLUS the most typical payload. Beyond that, the elevator's maximum load is maximized (with the same motor and gearbox) if the counterweight cancels out the weight of the car PLUS the half the maximum load (but that makes the empty car and light payloads cost the maximum energy per trip). I don't know what balance point they choose for actual elevators.
Love your vids :D
Verry cool video ! I'm also a big elevator fan since childhood.
/Niclas, Sweden.
Input 3 is the floor change impulse, and inputs 6 and 7 are leveling up and down. All of these inputs are from the tape reader.
You pretty much eradicated my fear of lifts.Thank you!
aww that's great to hear :) I was terrified of them, but when you get to see everything it's just a box on a track being pulled up and down by a motor. Yes, things can go wrong and you can get stuck, but that's just down to a man-made product developing a fault - usually nothing to worry about!
For sure! :) Will keep up to date with your videos from now on too. Never thought Lifts could be so interesting. Anyway thanks for taking the time to reply. Definitely got a new sub
It’s good the hear that this video “lifted” your fear!
Love the sounds! Now if you could only upload the scent of all that action!
I'm loving your videos, really enjoying them.
Amazing! I wish my job's elevator room weren't closed XD
I would pass some hours admirating
you should ask! If you don't you will never know...
Julian Curmi - Ask them to enter there? they won't do this unless I become a Manager XD
And even then, they would think I'm crazy for asking it =[
"hey, can I take a look at the elevator room?" "why?!" "just curious." "hahha what? why would I do this? pff"
THE LIFT IS SO DANGEROUS
Scary Hacker Why?
PLC controlled ... I like it.
+38911bytefree I remember this place being built when I was a kid. It must have been late 70s. I bet it wasn't a PLC back then. The PLC was probably added in the 80s.
mrmattandmrchay Yes, 70s was too early for PLCs. They are no that charming, compared to relay cabinet. But, I still prefeer a PLC over a "custom" rack full of boards. PLC are known solid. By the way, here, most 60 to 80 buildings have still relay cabinets for control and the fact that one or more floor remain latched is sort of a luxury. The average ones, just starts when you push the button and then ignore any other button till it stops, almost no logic. Even the modernized ones, just car cosmetics, and fit digital indicators, but machinery remains untouch. Of course, large building and comercial ones have their lifts are up to date. But not the residential buildings. I believe that is too expensive. As per the manufacturers, only the big building get well known brands. The residential ones are unknown brands, many of them have closed long ago. I dont think they built their machinery, they bought it from Siemens of something like that (as I was told from a lift technician).
i love that motor revving alien spaceship kinda sound :D
kingmcbrian I remember this noise from when I was a kid - finally got the chance to explore it, but it's no more... th-cam.com/video/N0MgGl2Jh94/w-d-xo.html
Daniel Nuker Many thanks Daniel :) I like making them too, and what is extra special is getting great comments like this. Thanks once again.
:D tnx i reely love your vids
415v is very lethal and dangerous
+Elvis Ramos Paahhh depends how u use it or what u do with it. I work on 415 all time and have hardly ever got shocks etc even when i work on it live
+Red Rhino Film & Photography i work on 120v in my state
mrmattandmrchay kk
leds were invented in the 60's, and are used in consumer electronics since the 70's-80's so you like very old elevators with owners that are not wealthy enough to buy a new one
You must be Smith, John smith who is fascinated the motors when you have a Big blue box behind you!
good job
Cool, got ya! Thanks for explaining and I will change the annotations :)
PERFECT FOR THE PEOPLE WHO LOVE 3 PHASE STARTUP SOUND :D
Avesome motor room of butafole lift,nice! ;-D
Someone in Sweden already did that... A lot of pre-1940s control equipment salvaged... Virtual museum coming up at some point in the future.
Great one, as always!
Nice to see the Mitsubishi PLC being used there as that's the brand i use a lot in projects. I have the successor for the PLC in the video somewhere in a box waiting for a project to use it in.
You are very sucessful in finding unlocked motor rooms, but how many locked ones does it take on average before you find an unlocked one?
thanks Harri, I've just had to revisit it also! 6'500 views now - cool!
all you needed to see was the PLC based controllers.... there is the reason the machine room is left un-locked.... frequent visits by the building people to do a one arm salute- on and off of the disconnect because people are stuck in their elevators. Several companies used PLC's they all were pretty much junk and most of the PLC's were no longer available when you needed one. ALL the programming that made it an elevator was stored on a couple of EEProm chips....Ladder logic. Service people using a jumper wire for troubleshooting were the biggest reason for needing a replacement. They were a great mix of low voltage and 120 volt terminals.... they don't like to mingle....... when the time comes your looking at a total mod job because you can NO longer buy a $400 PLC replacement...
@TarzanAndConz Yes, I remember that unit being a PSU and 485 expansion module.
I don't believe these lifts were ever linked together, or if they are then it's a very simply interface. Both lifts tend to respond to all both calls.
I suppose the PLCs were used when dedicated lift controller PCBs (designed especially for lift control) were not around. The manufactures just upload a configuration, probably designed by themselves. No-one probably gave much attention to detail.
Coll, thanks! I've another one coming soon that explains how the Otis carriage selector works using animations and stuff
Imagine if the owner was riding up on that car
yes thats it, thanks so much!
Pretty sure in saying that where the counterweight passes the lift car it should have a wire cage in front of it, certainly the ones I have worked in and around on have all had guards fitted.
Manual Crank - AKA hand winding...
If you see 1:05 to 1:12,the handles (yellow wheel) are loose on the floor - this simply pushes on to the end of the motor (square fitting). Then you switch off controller, release brake (which is shown at 1:40-the spring thing-using release handle which I cant see here) then you turn the wheel which is manually turning the motor, by hand.
This would not be my job... I'd be terrified to fall! 😱
To answer your second question: that´s the counterweight. Every traction lift has got one, without it won´t work. And even some hydraulic lifts have got counterweights.
Your first question can only be answered by Matt himself ;-)
Thanks for all your comments :) It's the energy that I need to keep making movies. I have an extra special one coming soon that explains (using animations) how the Otis Carriage floor selector works - great piece of engineering!
Almost 6 years later and I STILL watch this video!
So, lifts huh? You from England? :D
(1) I'll try and explain. Simply - Most mains power from the street is run at 415 volts and three wires - we'll call then RED YELLOW and BLUE wires. Each wire is a "PHASE". Your house mains power is 240v, this is taken from between RED&YELLOW or YELLOW&BLUE - this is two phases and makes a smaller voltage (240v) ... (continued at 2>)
Cool thanks. By the way, I have another video that I'll be uploading soon that you'll find facinating (be ready in about 2 weeks as loads to edit!)
heaters are to make sure it doesnt get too cold for the transmission and motor lubricants. (they not in use 24/7 non stop so gelling of lubricants can be a serious issue)
the thing at the back of the lift is the counterweight, it is usually weighs the same as the lift car half loaded. As for putting his hand down the shaft, well that hole is for all the wiring to come back from the landing buttons and indicators to the main control panel. I am a lift engineer...there are things i know! lol
I used to work in sales for a lift co. Selling fancy new control panels to replace the type in this vid. They were about £40,000 and nobody ever fucking wanted them.
I enjoyed screwing around in motor rooms though, and riding on top of the cars sometimes.
£40K for a controller? You could likely buy an entire generic lift for less.
Also very fascinated in lifts since I was young :)
...how about now? For me, this interest has stayed with me since I was about 8 years old.
Now the interest still lives
mrmattandmrchay
mrmattandmrchay....Sounds like you know your stuff....I addressed you in another thread in which the elevator crashes up, but wasn't sure if I addressed it to you directly, since the "reply" button wasn't there, so my apologies for a possible double question...Has there ever been a recorded case of elevator crashing into the top of the shaft with such force, that it broke off the car cable attachements and crashed back down to the basement? Also one would think, if that were to happen the ceiling at the top of the shaft could be damaged from such hard impact, to the point of structural failure...If that were the case, could the elevator machinery actually fall through the ceiling and crash on top of the elevator down below at the bottom of the shaft?
abc123 No, the only cases of an elevator falling is when the whole roof, such as 911, caves in. In that case, all the cables, including the governor cables were cut, so the car and counter weights went into the pits, which is why the doors on the sky lobby on the 21 or 22 floors blew out. Cars can go up into the overhead, but the crosshead and machine beams are the strongest part of the whole installation, so no damage is done. We did have one case where the car went into the overhead (the counterweights are generally 40 to 45 percent heavier than an empty car) and it hit hard enough to set the safeties with the crosshead pinned against the machine beams. We had to crawl out and chisel the safeties free to get it to come down.
I'm in 3rd grade now and interested since I was in Preschool! :D
You have sooo much balls if i was up there i would die i have a fear of things like that.... how the hell did you know the switches were lights?
The P.L.C.or Programmable Logic Controller basiclly is all preprogramed you plug in your computor and then work out the speeds and slow downs on to the PLC from the magnets on the tape in the shaft,just giving you basics , you dont learn these things over night . Also that part on controller that you were not sure of I believe is the Reverse Phase Relay
plug in your computer
P.S. I love the whooping motor sound and the beep from the top of the car sounded like the doors could yous some oil though LOL ;)
The little camera 🎥 that saw you looking at the devices oh no woop woop its the sound of da police!
ah you mean like @9:56? This is the door edge photo-electric beams. If the doors have an object between them then it prevents the doors closing, or reopens them. You can see it clearly at 12:30 - on top is a 7-segment LED. It lights up all digits when any beam interrupted and goes back into a "chasing circle" display sequence afterwards.
:o WOW I WISH IMCAN TUCH ALL THE STUFF IN THERE(:
They should add breaks to elevators so if one falls, it detects motion and prepares breaks.
lol they've been fitting those to lifts for over 60 years now but good shout any way, they're called safety gear blocks.
They're BRAKES not BREAKS
Elisha Otis invented that in 1854, obviously great minds think alike!
Chillius they do have these but they are tucked away on the side they are called manager motors
Chillius yup they do I'm a elevator mechanic it has safetys u won't fall unless someone is careless well
(2>>> continued)
240v in a motor room is probably used by the controller, possible door motor. But if you want the run a big motor like the one the makes the lift move, 240v is not enough. This requires THREE PHASES to make the 415v. There are bigger relays that switch this power to the motor in the cabinet.
If you touch 240v you'd get a stock but probably survive(you wouldnt do it again though lol!)
If you touch one of the 415v phases you probably wouldn't live.
Hope this helps?
It has its ups and downs.
Well IMHO the resistors are used to start up the motor, and then short circuited to get the full speed at the ratings wrote on the motor, as it can be seen in the diagram in the end of the video. To slow down the car the same procedure is made with the low speed windings. The current used by the motor pass through these resistors, so checking the Vr and the resistors values the current can be calculated, checking if it is in overload. PS: sorry for my bad english.