What elevator system mode releases the elevator from control by the central controller?

What elevator system mode releases the elevator from control by the central controller?

• A. Independent service mode
• B. Phase one mode
• C. Phase two mode
• D. Inspect mode

Answer: (A)

Independent service mode is the setting that takes the elevator out of the central controller’s normal dispatch loop. When this mode is active, maintenance staff can operate the car directly using an independent service panel or key, bypassing the building’s central controller. This allows testing, repairs, or adjustments without the central dispatcher issuing travel or door commands, keeping the rest of the building’s elevator system unaffected. Phase I (fire emergency recall) moves elevators to a safe floor under safety controls and is not about releasing control from the central controller for maintenance. Phase II returns to normal operation but remains within the central controller’s oversight. Inspect mode is for maintenance checks but doesn’t inherently free the car from centralized control.

Independent service mode is the setting that takes the elevator out of the central controller’s normal dispatch loop. When this mode is active, maintenance staff can operate the car directly using an independent service panel or key, bypassing the building’s central controller. This allows testing, repairs, or adjustments without the central dispatcher issuing travel or door commands, keeping the rest of the building’s elevator system unaffected.

Phase I (fire emergency recall) moves elevators to a safe floor under safety controls and is not about releasing control from the central controller for maintenance. Phase II returns to normal operation but remains within the central controller’s oversight. Inspect mode is for maintenance checks but doesn’t inherently free the car from centralized control.