Finally got a 20 year old Otis controller talking to a modern dispatcher

I've been chipping away at this upgrade for a client in a small office building near Dayton. The old relay logic was a mess, but the owner wanted to keep the original cab fixtures. After about 3 months of testing on the side, I found a solid state interface module that matched the voltage. This week it all clicked and the cars are running together without ghost calls. Has anyone else tried mixing old machine room gear with new lobby panels?

2 comments

2 Comments

andrew_nguyen641mo ago

Sounds like a massive liability waiting to happen. Mixing old and new parts just creates a system nobody fully understands. Honestly, you're better off pushing for a full modernization.

river_fox181mo ago

Liability waiting to happen" is a bit dramatic tbh. If the voltage matching is solid and the interface module is properly rated, it's no different than any other retrofit part. As long as you documented every connection, you're good.