Which mode allows an elevator to operate independently from the central controller?

Which mode allows an elevator to operate independently from the central controller?

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

Answer: (A)

The concept being tested is operating a single elevator without relying on the central controller. Independent service mode is designed to bypass normal centralized dispatch and let a technician or a single car run under local, manual control. This is essential for maintenance or service work where you don’t want the central system’s scheduling to affect the elevator’s movement or door operations. In independent service mode, the car can be moved and doors can be operated using local controls, without waiting for hall calls or central algorithms to assign the car. This contrasts with other modes: up-peak mode organizes car allocation to handle heavy passenger traffic but still depends on the central controller; Phase One mode is a fire-service procedure that overrides normal operation for safety; and Inspect mode is for testing and diagnostics, not for regular independent operation of a car from the central system.

The concept being tested is operating a single elevator without relying on the central controller. Independent service mode is designed to bypass normal centralized dispatch and let a technician or a single car run under local, manual control. This is essential for maintenance or service work where you don’t want the central system’s scheduling to affect the elevator’s movement or door operations.

In independent service mode, the car can be moved and doors can be operated using local controls, without waiting for hall calls or central algorithms to assign the car. This contrasts with other modes: up-peak mode organizes car allocation to handle heavy passenger traffic but still depends on the central controller; Phase One mode is a fire-service procedure that overrides normal operation for safety; and Inspect mode is for testing and diagnostics, not for regular independent operation of a car from the central system.