The footage of the lift with bypassed inner door was filmed in a shopping center in France. The footage was filmed by La Patate Douce. See his channel..... / @lapatatedouce
One of the coursework units at uni which I mention in the video was a fictional story heavily based on Therac 25. This part of the course lasted an entire term and was about machinery and accidents. To get a good mark on this we had to write about the issues in the material we were given. But to get a good mark on this we had to only write about software. The tutors had zero interest in interlocks and safety relays. The attitude was that everything is about how well the software is written. Then as well as this, on other pars of the course, both tutors and students had no regards for interlocks on anything. I felt the entire 3 year course pushed a dangerous narrative that the whole world is about software with no mentions of hardware. But ultimately, going to uni was a complete waste of time. I didn't feel that I learnt anything meaningful there. The lecturers had zero interest in working with the students. They just turn up to a room with 300 students and read the slides of a power point presentation for an hour then sod off back to their office. Most of the coursework was just writing exercises, that felt more like school than uni. In the 3 years there were only a couple of practical hands on electronics classes. Ultimately the entire thing was just a means of the students getting their degree so that they could get a job. I had no interest in this. I went there to learn and I didn't feel that I had really learnt anything in 3 years. As for jobs, only full time jobs were offered, which I couldn't do as this would get in the way of my cheap flight adventures. And the companies that came to the uni recruiting students were all just full of buzz words and gimmicks which didn't inspire me to join any companies. So in the end the only thing I got from uni was a piece of paper to show I had a upper send degree in computer science. A degree that has zero benefit for having it.
What shocked me when my friend shown me this lift is that children could easily open the doors and break hands/arms/legs...even when i done it on purpose i didnt feel safe. The door itself is also very light, so if it break the elevator would ride anyway. Glad I've sent these video, i know that you would make something very interesting with it :)
In Germany there was an elevator that went off when a person tried to get in ... he survived after the firefighters cut him free ... that took 1 hour ...
At last and at last again. i) outing myself as a simple fan of lifts without the feintest how they work, I am exceeding grateful for the circuit diagram and explanations. Thank you! ii) At last someone is prepared to speak out about this appalling group - think that nothing will ever go wrong with computers. I'm shocked that your Uni course didn't dare mention this possibility but I s'pose I'm jadedly not surprised in this world we find ourselves in. "Not my fault" is far too common a squeal nowadays.
The furniture shop near me had a slow generic, not in speed, if you opened the shaft door while it was moving it would run for 3 minutes before it emergency stopped
Very interesting to know about how lifts can be very dangerous if they aren’t maintained properly and are at risk of causing serious damage and fatality. Even not being checked correctly can cause a lift to be very dangerous and out of order.
I come across the opposite issue quite often, the contacts on the landing doors aren’t properly aligned so if I try to open the landing doors without unlocking them the safety circuit will cut out
At a hospital here in Houston TX a tech bypassed all safeties and forgot to turn them back on before putting the car back in service. A doctor lost his head quite literal decapitation. Made the news here it was a giant mess. So these situations can be very dangerous for ordinary passengers as well.
The safety circuit of the lift car on Kone KCE's is software. They use two independent BUS-Systems called TTS1 & TTS2. So software safety is already a thing (sadly...)
Lifts in south east asia have new features ACOP and UCMP rope grippers electrical safety interlocking to deal with brake failures and the stuff shown here, not sure how those rope grippers are installed on MRLs cos u can't even see the rope gripper on MRLs
But no matter how many safety relays you have a worn or faulty brake can be the most dangerous thing that can result in a lift shooting upwards with doors open. A safety relay will stop the motor and apply the brake but if the brake is worn or faulty then nothing can stop the lift moving. I did hear of a device called “rope gripper” which detects and movement of the lift when it’s supposed to be stationary and immediately binds the rope. Also the rope gripper is activated during any power outage.
Brake failure is the most common cause of accidents in lifts. Especially in China and countries with a poor safety record. As for a rope gripper, I have never seen a device like this in the many years I have been looking at lifts. The device that protects a lift from brake failure is a bi-directional governor, which has to be fitted to all lifts since the fairly recent update to the regulations in the UK. Before this governors were downwards protection only, which was utterly ridiculous, and a classic example of people protecting from what they think would go wrong rather than what actually goes wrong in real life. I have talked about this in my lift misconception series of videos.
@@benolifts Downwards only? Terrible, that means the emergency rail wedge brakes could never engage upwards? Nobody thought of logic/main brake failures sending the thing into the roof?
The people setting the regulations are utterly thick and don't have a clue what they are doing (which can be said about many other subjects as well). They are too obsessed with the obvious (e.g. cable snapping) despite this almost never happening. They have no grasp of how things work in practice and what the actual risks are. Only took them over 100 years for the regulation of bi-governors to become mandatory.
I encountered a weird malfunction recently in my local shopping mall. One of the lifts there has a reputation for being out of service with some regularity. A couple of years ago it was modernized, which didn't fix its reliability issues. In particular it had issues leveling. So a while back they simply reduced the lift's speed. It only travels between 2 floors (shopping mall and parking garage below), but now it takes about 30 seconds from doors closed to doors opening. Anyway what happened recently, I was in the lift going down to the parking garage and had my shopping trolley facing the door, ready to exit. I accidentally leaned a bit forward and happened to wedge a corner of the trolley between the doors just before it reached the parking garage. Now the lift stopped as you'd expect, but after pulling back my trolley, the lift announced it was on the parking garage level and opened its doors, despite still being about 30cm (~12") above the floor. Luckily I noticed, but someone could really get hurt that way! I stepped out, then lifted out my trolley, then sent the lift back up and called it back down. This time it leveled properly. I did report the incident to the maintenance company displayed inside the lift and they said they'd look into it. No idea if they did, and now that I think about it I'm almost tempted to go and try if I can recreate the issue ;)
What you describe is not a fault. The lift was in a door zone, so it was ok for it to open the doors. This is correct behavior from the lift. Every lift logic behaves differently to the fault scenario of safety disconnected while travelling. If the lift stops within a door zone some logics will open the door. This is perfectly acceptable. For example, the lift could have banged its rollers in the door zone. The logic doesn't know if safety is about to connect again or not. Since it is in a door zone then it is good to open the doors to free the passengers.
Apparently the safety getting bypassed is a common issue in lifts within China as there’s been many incidents of lifts starting to move with the doors open, often resulting in injuries or fatalities.
Would have been better if they had used shaft switches which the lift car could press to bypass safety just for that floor on the other lift when opening a door. Then also use some sort of beam sensor as an E stop for if the lifts got too close. Would be nice if Kone made an ecodisc MRL twin lift. I hate the patent system. We are stuck with only ThyssenKrupp making them, who are notoriously crap at making reliable lifts. It is also shit that Mitsubishi has the patent for spiral escalators. Would be amazing if we could have these everywhere, instead of just a couple of Vegas Casinos.
Singapore public housing blocks are full of Chinese made lifts from IFE, Shenyang BLT and XJ Elevator that are cheap shit and breakdown frequently. Almost all the major brands make lifts and escalators in China factories too and supply to most parts of Asia.
I’ve noticed on a few Monospaces in Northern Ireland having a weird feature where the door unlocks and opens slightly if the lift is idle for about 5 seconds, if you pull the doors they open. Would this be dangerous? I’ve not been able to try it but I’d like to send it to a different floor to see if the door closes or if it stays open.
That is not dangerous. It depends on the setup of the door unlatched. If it is the type where it has to be powered to lock then it save wear to have it released. The only reason to lock on this scenario is to keep people out a locked off lift. This can be enabled in the settings.
The Door of that lift doesn't look closed at all that's probably why the safety was bypassed. At this point an old innerdoorless lift is safer. There is a way to break every code in this universe even simple ones like a Hello World. I had to make a DIY alarm for a door or at least the code of it and i wrote in the readme file that you have to use a relay in order to make it work even if the code breaks and got the best mark out of the entire school.
In my epic apartment building there is a old končar lift that has been modernized in 2009 and the interior is horribly reflective, reflective doors, etc. i wont go on the lift topic, i will talk about the lift doors, the doors are horribly cheap and dodgy. Every time when the doors close and the lift starts accelerating, you will probably hear weird noise and it opens slightly, lastest time it hapend about 2 years ago i was riding it and when it accelerate i hear the wird sound and BANG! and once aigan MMMMMMMMMMMMMMMM BANG! that scared me, it also hapend during the full ride with my grandpa i was panicing i was pressing the floor 5 and it didn't stoped, then 6 and it stoped there and the rest i used stairs to floor 7, my lift doors today are fixed so it still opens very very slightly, you can also pull the doors aswell, lift like this it should have motor replaced instead! one thing about it that when it almost opens way slightly while going up or down it closes after that so i think i actuly kinda like that cause it can't break the safety, i think this means that the door is programed to not safety break
Aparently there are a lot of dodgy lift in China. When I visited Shenzhen all of the lifts I visited in the skyscraper areas were over engineered and very well built and maintained, and were better than most lifts in the UK. But I didn't have time to visit any ordinary housing estates a long way from the tourist areas. I wonder if the lifts there would have been completely different.
@@benoliftsnow, i didnt went to china. But öne thing i know about there is the fake lifts. There are lots of fake mitsubishi fake sigma branded otises. Which are WORSE and the lifts which are in more poor areas.
@@benolifts The amount of videos of failing lifts in china including poor breaks that even once chocked a student as his body was stuck half way in is just sad. They obviously cheap out when they get the chance.
The shopping center could be in serious shit for this. The shopping center could possible sue the lift maintenance company (I have no idea what the laws are like in France). I feel that the maintenance company should be named for this health and safety issue. Probably would need to look in the cabinet for the maintenance log card, as the lift may not be the current company maintaining it.
@@benolifts I think that would be Orona (the maintenance company for this lift) that could be sued for "Endangering the life of others", there is a heavy sanction for that
About the C.S thing, what you are saying about everything can't be software is true. Let's first put this. But what you want is out of scope of what a "C.S Course" does What you are looking for is something more specific engineering based field or whatever is concerned with. There, they for sure know when designing such logic to control machinery that you can't totally rely on software
