Door interlock systems are integral components of elevator safety. These systems prevent the car from moving unless all doors are securely closed.
Learn how interlock systems work and their role in improving elevator safety. Then explore elevator video monitoring solutions from ELEVATE Monitoring to further enhance your elevator security.
What Are Elevator Door Interlock Systems?
Elevator doors must include several safety mechanisms to open and close at the proper times, avoid closing while passengers are entering or exiting, and stay closed throughout the ride. One component of this safety system is the interlock system.
A door interlock is a device that prevents the door from opening unless the car is present and level with a floor. The device also prevents the elevator car from moving unless all landing doors are securely closed and locked.
This feature prevents passengers from falling into the shaft and stops the car from moving while the doors are opened, which would be a significant safety concern.
How Elevator Door Interlock Safety Systems Work
Elevator safety interlock mechanisms use a combination of electrical and mechanical components to ensure that a car is properly aligned with a floor before the doors can open, and to ensure that the door is closed and latched before the car can move.
First, sensors confirm whether the elevator is stopped within a specific zone at a floor landing. This zone is often only a few inches wide.
Before an elevator car begins moving, a mechanical latch engages the hoistway door, preventing the door from being opened from the outside. The interlock is also a necessary component in an electrical circuit that only engages when the car is within the target zone and the hoistway door is fully closed and locked.
Interlock systems often use multiple contacts to ensure that a single fault or short circuit won’t inhibit the safety mechanism.
How Door Interlock Systems for Elevators Improve Safety
Elevator door interlock mechanisms are an integral component of elevator safety compliance. They ensure that the doors remain closed and locked for the entire ride, only opening when the elevator has reached the proper positioning on a floor. Without this system, malfunctions could cause the elevator doors to open when the car is in motion, placing passengers at risk of falling into the shaft.
Interlock systems work together with a range of other elevator passenger safety features. For example, some modern elevators also include door lock monitoring (DLM) as an added layer of protection. This technology continuously monitors the door interlock and car door circuits for bypasses or faults, stopping the elevator if any issues are detected. Even if the interlock thinks the door is closed, the DLM can verify this before allowing the car to move.
Upgrade Your Elevator Safety With ELEVATE Monitoring
Elevator door interlock mechanisms, along with other safety features like elevator door lock monitoring technology, help keep passengers safe. When the rare malfunction occurs, ELEVATE Monitoring’s two-way video communication systems ensure that passengers can receive prompt, expert assistance. Call 877-990-9191 to request a quote.
