Home Forums General Discussion Technical Questions Dover composite no high speed

So the elevator has shutdown a couple times at exactly the same spot in the hatch. I thought I was clipping a door lock so I was mislead for a while. Last night a passenger was entrapped and when I arrived the building, thankfully , left the line in and I was able to see what the elevator was actually doing. Intermittently, the elevator will neglect to accelerate into high speed. It will respond to a hall call, or home to a floor, at around 10-12 fpm. It will creep down the hatch until the "FT timer" trips and shuts it down. After going through the prints I figured that maybe one of my "F" relays either wasn't picking or not making contact. I cleaned them up. I later took out the "V" slowdown IBM relays and either sprayed them with cleaner or replaced them depending on how my tester read them. I am not confident I got it because I really wasn't able to cause the problem by blocking contacts. I plan to go back tomorrow and am looking for any other ideas on what may cause a composite to act in the way I described. Also, I witnessed the problem in both directions.

Same spot in the both directions?

Well, the first two calls the elevator was shutdown at the 3rd floor at the same spot. I think it was travelIng in the up. The 3rd and 4th call it was shutdown at the same spot on the 1st floor. That was in the down direction. I only saw the elevator actually having the problem on the 4th call back. Every other time I was playing detective after the fact.

This problems sounds pretty complex but any time a composite stops away from a floor and won't level into one, that sounds like a typical CS lock up problem when CS relay pulls in and self holds, your stuck and with no door zone relays in, your stuck with the doors closed. I would change all leveling inductors and the selector micro card. I know, sounds like a shotgun approach but that is the most frequent of this type of call. Unless, you have an open traveling cable wire which is possible, when the constructors hang "heavy" travelers, this happens when the steel core cable cuts through the wires slowly over time that are near the center of the TC.