: These are essentially specialized computers with variable frequency drives that can be programmed through a serial interface to manage door travel and speed. Common Maintenance & Troubleshooting
If an elevator is "fixed" (stuck) or malfunctioning, maintenance personnel typically follow these steps: Xizi Otis Elevator AMCB2 Manual | PDF - Scribd 5 Jul 2006 —
Troubleshooting and Maintenance: A Guide to Xizi Otis Elevator Systems