⛔️⚠️ It’s important to mention the many dangers which are present in lift motor rooms. They are not environments for the inexperienced, and one mistake could be the last thing you do. There are exposed terminals with voltages of up to 415 volts. If you touch them, they WILL kill you. Please do not put yourself into this dangerous environment without proper authorisation. ⛔️⚠️
Nice presentation of this lift, good to see such an old one still working! The views of the controller are especially interesting. I like the way the door open and close contactors are mechanically interlocked.
Thanks! Yeah, I’ve never seen the door controller be designed like that. I’ve been told it’s to prevent them both being activated at once as they switch, but I’m not sure why all the others I’ve seen don’t need that. Sadly these lifts are currently being replaced. I’m glad I was able to see them though! They’ve had a very good run of over 60 years!
@@Lift.Tracker Exactly, this is to prevent them from both activating at the same time. They should also be electrically interlocked on logic level but the physical one just adds an extra layer of safety. Since these switch 400V the short would be pretty bad if they activate at the same time, creating a big boom. Old Schindlers have the same interlock on their main contactors. In fact, the main contactors on the lift here should have this too. So that's the use case: On main contactors switching 400V and one of the contactors flipping 2 of the 3 phases to change direction of the motor.
@@TheLiftDragon Are the door relays actually 415v? That’s quite surprising. I assumed they’d be something more like 110v for the door motor. These are some of the first Express Lifts to have automatic doors being from the 50s. I guess they later changed the design a bit and found the extra mechanical protection to be unnecessary.
@@Lift.Tracker It depends on the door motor type. There are different door operators that require different voltages. Modern ones often being DC PWM but old door motors generally just are small 3ph AC motors. 3ph AC is the simplest way to drive a motor with 2 directions. You just need 2 contactors, that's it. No rectifier, no fancy circuitry. You get a motor that is very powerful for its small form factor and it's also cheap since they're mass produced. Old Meiller doors for example are another prime example of doors that use these motors. The mechanism is really interesting because it uses a leadscrew with variable pitch. This makes the door go slow near the ends and fast in the middle with the motor rotating at a constant speed.
⛔️⚠️
It’s important to mention the many dangers which are present in lift motor rooms.
They are not environments for the inexperienced, and one mistake could be the last thing you do.
There are exposed terminals with voltages of up to 415 volts. If you touch them, they WILL kill you.
Please do not put yourself into this dangerous environment without proper authorisation.
⛔️⚠️
Keilriemenantrieb, ich flipp aus. 🙂
Aber eine schöne Maschine. Lustige alte Technik.
Nice presentation of this lift, good to see such an old one still working! The views of the controller are especially interesting. I like the way the door open and close contactors are mechanically interlocked.
Thanks!
Yeah, I’ve never seen the door controller be designed like that. I’ve been told it’s to prevent them both being activated at once as they switch, but I’m not sure why all the others I’ve seen don’t need that.
Sadly these lifts are currently being replaced. I’m glad I was able to see them though! They’ve had a very good run of over 60 years!
@@Lift.Tracker Exactly, this is to prevent them from both activating at the same time. They should also be electrically interlocked on logic level but the physical one just adds an extra layer of safety. Since these switch 400V the short would be pretty bad if they activate at the same time, creating a big boom.
Old Schindlers have the same interlock on their main contactors. In fact, the main contactors on the lift here should have this too. So that's the use case: On main contactors switching 400V and one of the contactors flipping 2 of the 3 phases to change direction of the motor.
@@TheLiftDragon Are the door relays actually 415v? That’s quite surprising. I assumed they’d be something more like 110v for the door motor.
These are some of the first Express Lifts to have automatic doors being from the 50s. I guess they later changed the design a bit and found the extra mechanical protection to be unnecessary.
@@Lift.Tracker It depends on the door motor type. There are different door operators that require different voltages. Modern ones often being DC PWM but old door motors generally just are small 3ph AC motors. 3ph AC is the simplest way to drive a motor with 2 directions. You just need 2 contactors, that's it. No rectifier, no fancy circuitry. You get a motor that is very powerful for its small form factor and it's also cheap since they're mass produced.
Old Meiller doors for example are another prime example of doors that use these motors. The mechanism is really interesting because it uses a leadscrew with variable pitch. This makes the door go slow near the ends and fast in the middle with the motor rotating at a constant speed.
Mrmattandmrchay did multi-camera views with this exact elevator
Very rare to see one of these unusual belt driven units still in original form. A shame the original selector was replaced though.
YIPPEEE. Do you have discord or anything like that mate?
Seems like the bearings are on its way out
Original floor selector replaced to electronic floor selector
1957 or 1975?
1957. These ones are very old!