Elevator Forum

Of recent times I have only worked on hydro's with a motion contactor before the star/delta changeover so it would have to weld both sides before it w...

Is the safeties and governor contacts cutting the safety circuit properly and dropping the driving motion to the traction machine, so its not driving ...

Originally Posted By: danzeitz Uppo72- not to get off topic but I visited Sydney Aus in 2010 and cant wait to retire and get back for an extended visi...

Originally Posted By: danzeitz uppo72, I was so new I didn't even know to question why AC vs DC. When I was taught that way by the wizard from the mot...

Rando, don't feel bad about a genny blow out. It was always part of the Otis maintenance program and yes if not done a lot, it can cause problems. Jus...

Thanks mate.Edit: ah right now I know what you are talking about. Indeed I have seen these, particularly in low rise buildings. I can see the XDR rela...

Originally Posted By: Rolly Well there is a huge difference between a 10UCL and a 20UCL. 20 is slate board with the relays mounted on the slate. The s...

Originally Posted By: Rolly Guys, NT only picks up if the car RUNS or the door gets signal to open. He says the car is sitting at the floor and won't ...

When talking about the ac ripple of a tacho, are we talking about a ripple where the commutation isnt a perfect dc line? Last edited by uppo72; 09/...

Originally Posted By: uppo72 When talking about the ac ripple of a tacho, are we talking about a ripple where the commutation is a perfect dc line? ...

When talking about the ac ripple of a tacho, are we talking about a ripple where the commutation is a perfect dc line?

Originally Posted By: Chris Line feeds both STR and RU simultaneously, they switch the motor from wye to delta. The good news is all the cars in the s...

Originally Posted By: christycollett Look at NT Agreed.

Originally Posted By: Chris Problem is that both the STR and RU contactors are fed directly from the main line. When the contactor fused the only way ...

Hasn't this unit have a run timer within the control? I would assume there would a MC contactor ( as the first 3 phase input), then the star/delta cha...