A logic controller is the electronic brain of an automatic door. Some people call it the control box or control board. It reads input from the door’s sensors and switches. Then it tells the motor and operator when to open and how to move.
How is an automatic door powered?
Most automatic door controls take in 110VAC. They step it down and distribute 12 to 24VDC to the components. Older KM operators run full 110VAC instead. Those units can arc on the header cover.
Treat the power side with real caution. The doors should sit on their own circuit breaker, though they rarely do. Never run 110V out through or across an automatic door header. Lock out and tag out (LOTO) the power before you open a unit. This matters most on conversions and new installs. Use insulated screwdrivers whenever the job allows.
Can any technician program a control box?
Each manufacturer builds its own control box. Each one runs a different programming interface and its own diagnostic codes. A technician needs brand-specific training or tools to read those faults. Newer Stanley and Record systems have moved programming to Bluetooth dongles. Those dongles often carry a subscription.
Be wary of unusually cheap automation. A price far below the established brands usually signals a reason. We have replaced every off-brand unit we’ve met in the field. Our advice? Stick with proven manufacturers.