Otis VIP260 82GA generatorsgreenspun.com : LUSENET : Elevator Problem Discussion : One Thread
I have recently had the unpleasant experience of having two AC windings shorting together on an 82 Otis generator. This was on the monday morning, after I had shut the elevator down on the previous friday afternoon, needing a new hook contact (HCC). Lo, I have the precious commodity in my warm little hands, and have turned the elevator on. The generator did not start because I had ECR 3,4 blocked. As I pushed in LG to move the elevator from the top floor, the most awful growling noise erupted. Simultaneously, from the commutator end, a blue arc as big as my boss's behind flared. Oh, and a deliciously flavoured pall of smoke poured out as well.
My question, and I do have one, is, once I have received my rewound generator back from repair, is there anything I should be wary of? Like floor levels, up and down speeds ( compounding ) , slowdowns or anything similar?
-- Justin Ward (Transitive@planetaccess.com), January 17, 2002
Unless you had the comm. turned and undercut there will not be any change Regards, Jim
-- Jim Reed (firstname.lastname@example.org), January 19, 2002.
you may need to re-compound if the venders have moved the neutral point, however you should always recheck the neutral point and compound as a matter of course. it has been known to come back from venders with bad componding. always recheck! saves a court appearance mole
-- mole (email@example.com), January 19, 2002.
After much procrastination, my 82 generator arrived back to site. Gleaming, almost too presentable. A quick push of L, then M to check the direction of rotation went off without a hitch. Thence, a speed check on inspection speed. Up and down direction speeds appeared to be about equal. I summoned the courage to send it on a fullspeed run. Wincing as it neared the terminal floors, It stopped perfectly.
Having heard horror stories about the wye and delta windings of an rewound MG set wired in opposite directions, I was a little apprenhensive. But all worked out well. And I did fit that new HCC contact after all that.
-- Justin Ward (firstname.lastname@example.org), January 23, 2002.