Wiring Errors & Frequent Faults of Elevator Light Curtains? Practical Maintenance Guide for Technicians
The elevator light curtain is a core light-type safety device for elevator doors, widely applied in all kinds of passenger elevators and freight elevators. Mainstream models such as WECO 917A61, 917B, 957 and SFT 620, 625 are most commonly used in daily maintenance.
Its working principle is reliable: once any infrared beam is blocked, the system immediately outputs an open-door signal. The car door stops closing and reverses to open, resuming normal closure only after passengers or obstacles leave the detection area, fundamentally preventing elevator door clamping accidents.
Key Wiring Tips
Proper wiring is a fundamental maintenance skill. Elevator door sensors are equipped with two detachable plugs:
- Power plug: connects to a 220V power supply, usually shared with the door operator power.
- Signal plug: relay output with COM (common terminal), NC (normally closed), and NO (normally open) interfaces.
Different elevator control cabinets require different connection methods. Always check the wiring diagram according to the model to avoid incorrect connection that could cause elevator light curtain protection failure.
Common Faults of Elevator Light Curtains
Most issues fall into three categories:
We keep a full series of WECO elevator light curtains, SFT elevator light curtains, and supporting parts in stock all year round, compatible with major elevator brands for replacement and installation. NONA ELEVATOR, a trusted global supplier of elevator light curtains and spare parts, provides fast delivery, professional technical support, and reliable solutions to ensure safe, efficient, and long-lasting elevator operation.
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