How does an elevator know it’s overloaded? An expert tells all
How does an elevator know it’s overloaded? An expert tells all
2024-09-04
Reports recently surfaced online of some strange situations in elevators. They sparked debate about what really lies behind the signs that indicate "maximum weight" or even "maximum number of passengers" allowed in the elevator. Internet users shared stories of the weight limit warning alarm going off with nobody inside. Others claimed that their elevator had kept the sign indicating the maximum number of people, but the maximum weight had been reduced. How is a humble elevator user to make sense of this bewildering landscape? We spoke to some experts to get to the bottom of things.
When an elevator is overloaded, it makes a warning noise. But is that assessment based on the number of people inside, or on their overall weight?
Member of public
Don’t they all have signs with a maximum weight? I think it’s based on weight.
Member of public
Some people are thinner and some fatter. Elevators do say things like, “12 people,” but they also give a number of kilograms. But if everyone inside is thin or they’re all children, then maybe it can carry more people.
Reports came out, describing an experience of stepping onto an elevator that says it could carry up to seven people, but the warning noise came on before that limit was reached. Elevator companies say that the limit is not really connected to the number of passengers.
Hsieh Lai-chin
Elevator expert
It’s about the weight of the load. It produces a voltage that goes back to the top.
The sign telling you the maximum number of people that can step into the elevator is actually based on the standing room. What’s most important is the maximum load the motor can handle. A story emerged of a residential elevator that was replaced; the original had said it could carry 15 people or 820 kilograms. The new elevator said 15 people or 720 kilograms. The number of people was unchanged, but their allocated weight had fallen dramatically!
Hsieh Lai-chin
Elevator expert
If the motor is old, for example, or it’s been replaced, and it’s an old one, then they think, “I’ll lower the weight a bit to make it safer.” It’s about protecting the facility.
Reducing the maximum weight limit is primarily to protect the motor of the elevator. But sometimes, that warning sign can start up with only one person inside – or none at all.
That might be because a sensor in the elevator has detected that the elasticity of the equipment is exhausted, or perhaps that the equipment has got out of position. Such situations require an engineer to come and check it over, to prevent anything more dangerous from happening.
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搭電梯「超重警示狂響」 竟跟總載人數無關？
2024-09-04
搭電梯的限制，究竟是以人數為主，還是重量為主？民眾搭電梯，不難發現，電梯都會明確標示，載重還有人數上限，這時如果超載，電梯就會發出警示聲。就有人分享，搭的電梯，明明可以載七人，但沒想到，只載了六人，卻超重不能坐，電梯業者說，搭電梯，看總載重量，還是最準確。
電梯超載，警示音響起，但電梯有無超載，到底要看，乘載人數，還是總重量？
[[民眾]]
“它(電梯)不是都有說它的限重嗎？應該是(要看)重量。”
[[民眾]]
“人有比較瘦，有比較胖的，它(電梯)雖然寫比如說(載)12個人，可是它有寫公斤數，可是如果人都比較瘦，或都是小朋友，有可能它的(人)數量是比較多的。”
有人碰到，明明電梯，可以載7個人，人數還沒達上限，超重警示音卻嗶嗶作響。電梯業者說，電梯超載，跟人數可能沒有太大關聯。
[[電梯業者 謝來欽]]
“隨著載重，看它的重量多少，然後它會產生一個電壓，回到上面去這樣子。”
其實電梯內的，規定人數，指的是面積能夠站多少人，最主要還是要看，馬達的最大載重。不過也有人說，自家社區電梯整台換新，規格卻從原本的15人820公斤，變成了15人720公斤，明明限制人數一樣，怎麼公斤數，卻變低？
[[電梯業者 謝來欽]]
“比如馬達是舊的，還是有換過了，如果是用舊的，他覺得這個東西，可能我給你降一點(載重)比較安全，等於保護它的裝置。”
調整電梯總載公斤數，基本上，是要保護電梯馬達。但有時候，電梯只載一人，或根本沒載人，卻還是發出這樣的聲音...。
這可能是電梯機械偵測裝置，彈性疲乏，或是產生位移，這時候就要通知檢修，以免搭乘電梯，出了狀況，就會相當危險。
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