Elevator Motor

[dvcraven052256]

I do not know much about elevator motors but I will ask this question anyway.

In essence I have (4) elevators one in dedicated for emergency. So we are completely redoing the distribution system for a 29 story high-rise. The name plate photo is too large to post here but I have listed the data below:

D.C. Motor
Type - 98 G
N.L. Volts - 160
F.L. Volts - 175
Amps - 166
H.P. - 35
R.P.M. - 950

I will need to refeed (3) elevator motors to a new distribution panel on the roof. The motors are controlled via elevator controller rated for each elevator at 480/3ph which are fed from 200amp fusible disconnects.

My question is how do I convert this to AC load data on my distribution schedule from the 166amps is listed as D.C.

I hope my questions make sense.

 

[zbang]

166 amps times 175 volts (DC) = 29KW which conveniently is about 35HP AC or DC, that's the motor load (remember that elevator motors do not start full-speed across-the-line, so the startup surge is smaller).

Better question is what the controllers expect, which would usually be a question for the elevator company.

 

[infinity]

Wouldn't you use the input current rating for the controller?

 

[dvcraven052256]

If that's true why the 200amp fusible disconnect?

as an example a 40hp motor is 52 FLA. I must be missing something.

 

[zbang]

Maybe not, don't just assume that the original install was rational or correct. Could be that the EC had those disconnects on the shelf and wanted to move them out.

 

[dvcraven052256]

Yea I starting to think that as well. I have contacted the manufacturer to get data on the controller.