elevator Leveling sensor Kone 77U 77N 77S Cigarette rod proximity magnetic switch

1. Basic Concepts

77U Leveling Switch: Typically represents the deceleration switch when the elevator is ascending, located in the upper region of the elevator hoistway. As the elevator car approaches the target floor, the 77U leveling switch senses the car's position and triggers the control system to decelerate, allowing the elevator to stop smoothly at the floor.

77N Leveling Switch: Represents the deceleration switch when the elevator is descending, positioned in the lower region of the elevator hoistway. Similar to the 77U, the 77N leveling switch senses the car's position as it approaches the target floor during descent and controls the elevator to decelerate and stop.

77S Leveling Switch (sometimes not directly named as 77S but with similar functions): Serves as an auxiliary leveling switch, potentially playing an additional role in certain elevator systems, such as providing extra position confirmation signals or being used for special control logic.

2. Functional Characteristics

Reliability: The reliability of leveling switches is crucial for the safe operation of elevators. They must be able to sense the car's position accurately and stably, and trigger deceleration and stopping actions when needed.

Non-Mechanical Contact: Modern elevator systems typically employ non-mechanical contact magnetic induction switches for leveling switches, which offer advantages such as resistance to wear from long-term frequent use and a long lifespan.

Signal Accuracy: Leveling switches must be able to provide accurate car position signals to ensure that the elevator can stop precisely at each floor's leveling position.

3. Application Scenarios

High-End Brands like KONE Elevators: The 77U, 77N, and 77S leveling switches are commonly used in high-end elevator systems, such as those from KONE. These elevator systems have higher requirements for leveling accuracy and safety, necessitating the use of high-quality leveling switches to ensure stable elevator operation.

Various Elevator Types: Whether it's passenger elevators, cargo elevators, or other types of elevators, the 77U, 77N, and 77S leveling switches can be used as long as precise control of stopping positions is required.

4. Maintenance and Upkeep

Regular Inspections: To ensure the proper functioning of leveling switches, regular inspections and maintenance are necessary. This includes checking for loose wiring connections, cleaning the switch surfaces, and more.

Troubleshooting: If a leveling switch malfunctions, such as experiencing unstable signals or failing to trigger deceleration actions, the elevator should be immediately stopped for troubleshooting. During repairs, high-quality replacement parts and correct repair methods should be used to ensure proper functioning.

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