1951 and 1957 Otis traction

Guest · 2022-05-24T00:49:00Z

Recently came across these two Otis units . Its been tricky working on these chasing wires. The '51 is back in service and runs very good, it is in a residence, 3 stop. I have been able to study this one and compare to the other. Seems the transformer and rectifier have been updated. 1951 type:10N1P wire diagram: 2S6880A Machine Type: 35ESThe '57 is very similar but several more relay contactors, Just 2 stop. This one is not running yet, but its getting close. Original everything except maybe a capacitor on the back. 1957 type:10N1T wire diagram:13-1S6878 A Machine type:49ESThe good-The phase monitor engages. transformer output is at 100v on each pole, the rectifier had output of 135v DC, Door Open and Door Close contacts work when manually pushedNot good-"C" contact wont make, but it has DC- 60, 60 , 130 across the bottom of the contactor. Even if I manually engage the "C" contactor nothing else reacts. -The unit is between floors at the moment. At a point of needing some type of wiring Diagrams or any input from the old school Techs pictures coming..

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PATRCIK

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10/02/2023 1:19 pm

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