I love the old Otis units-21UCLS is my favorite controller. Being that the elevators serve a condo they have been in the best situation for longevity. That being said it is time to look at modernization. The new equipment will allow far greater efficient operation and future expansion-security operation-future fire codes etc. Most likely you would be installing new AC motors in place of the DC hoist motor/generator. This will eliminate carbon dust filtering into the building and into the elevator equipment. I tend to be a bit more bias in that I love the Regen AC drive we have at Otis-paired with the GCS contoller, I-Motion 2 door operator and M3 fixtures. I've adjusted many of these units and have had very few if any call-backs.
