On new job

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cadpoint

cadpoint

Senior Member
Location
Durham, NC
Occupation
Electrician - but not by NC Law.
I was snooping around the elevator equipment today and noted
that the controled box 208V (208 through job). The motor that lifts the cab was 328V.

Is it a fair statement to say that all modern elevator equipment is just a breaker, a VFD and some CPU equipment?
 
He's talking about the controls..even hydraulic elevators have a series of controls, motor control and protection, and logic to dispatch the car.

Do a Google search for "Elevator controls" and you'll find a wealth of info.

If Cadpoint is looking to fix an elevator control, my advice is DON'T. Way too much liability if you accidently bypass or defeat a safety control, and the systems can be quite complex. Contact the maker of the specific elevator to be safe. From his post though I think he's wondering about the difference in control vs. motor voltage.

Common practice in the old days was to have a motor-generator which powered the lift motor as most lift motors were actually DC.

AN INTERESTING VIDEO OF A DC CONTROLLED ELEVATOR
 
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mxslick said:
If Cadpoint is looking to fix an elevator control, my advice is DON'T. Way too much liability if you accidently bypass or defeat a safety control, and the systems can be quite complex. Contact the maker of the specific elevator to be safe. From his post though I think he's wondering about the difference in control vs. motor voltage.

Common practice in the old days was to have a motor-generator which powered the lift motor as most lift motors were actually DC.

AN INTERESTING VIDEO OF A DC CONTROLLED ELEVATOR
Click to expand...

I should have qualified I was only looking at name plate data, I've only ever just - "bring da power in"
Its all AC.
 
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mxslick said:
Common practice in the old days was to have a motor-generator which powered the lift motor as most lift motors were actually DC.
Click to expand...

The last time I worked on elevator feeders they fed just that, MG sets. The elevator motors were all DC with AC to DC motor generators. That was a while ago. The elevator constructors mentioned that the AC wasn't smooth enough for elevator motors so they used DC motors because you could actually feel the difference when riding in the car. Is this still SOP?
 
cadpoint said:
I should have qualified I was only looking at name plate data, I've only ever just - "bring da power in"
Its all AC.
Click to expand...

LOL Yeah, I had to add this as an edit to my post:

yours truly said:
From his post though I think he's wondering about the difference in control vs. motor voltage.
Click to expand...

Did anyone catch how interesting that arc in the video sounds? Definitely a different sound than the run of the mill 60hz arc. :D
 
Elevator motors can be AC or DC, utilizing MG's, rectifiers or frequency drives. I THINK

Hydraulics are generally limited to 5 or less stories (per a friend on mine in the Elev local)
 
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