Description

1. Safety Preparation: Before installation, shut off the elevator’s main power supply and lock the control panel using LOTO (Lockout/Tagout) procedures. Access the door lock assembly (car door or landing door) using a stable ladder or platform. Wear insulating gloves, safety glasses, and protective footwear to avoid electrical hazards or mechanical injury.

2. Remove the Old Contact: Locate the existing door contact on the door lock bracket (typically secured by 2-3 screws). Disconnect the wiring from the contact terminals – note the wire colors and terminal labels (Common, NC) to ensure correct reconnection. Loosen the fixing screws and carefully remove the old contact, taking note of its mounting orientation relative to the door latch.

3. Prepare the Mounting Area: Clean the door lock bracket with a lint-free cloth to remove dust, oil, or debris. Inspect the door latch plunger or cam that activates the contact – ensure it is free of wear or deformation (replace if necessary to guarantee proper contact engagement). Verify the wiring is in good condition (no fraying or insulation damage) to prevent short circuits.

4. Install the New Contact: Align the Nanjing Zhuye Elevator Parts KCB-R-5 contact with the mounting holes on the door lock bracket, ensuring the plunger faces the door latch cam (activation point). Secure the contact with the original screws (torque: 1.0-1.5 N·m) – avoid over-tightening, as this can bind the plunger mechanism. Reconnect the wires to the correct terminals (match the original wiring configuration) and use crimp connectors or terminal blocks to ensure tight, insulated connections.

5. Test and Calibrate: Manually operate the door to verify contact activation: the contact should close (complete the safety circuit) when the door is fully latched, and open immediately if the door is opened slightly. Use a multimeter to test contact continuity – confirm resistance is <50mΩ when closed and infinite when open. Restore elevator power and run 20+ door cycles (car doors and landing doors) to confirm the elevator only operates when doors are fully closed, with no false safety circuit trips or “door not closed” error codes.

• Wiring Compatibility: Ensure the contact is connected to the elevator’s safety circuit per the manufacturer’s wiring diagram. Reverse wiring can disable the safety interlock function, creating a hazardous condition.

• Plunger Alignment: Adjust the contact’s mounting position if necessary to ensure the door latch cam fully depresses the plunger (stroke: 1-3mm). Incomplete plunger activation can cause intermittent contact switching or safety circuit failure.

• Regular Cleaning: Clean the contact housing and plunger every 3-6 months with a dry cloth to remove dust or debris. Avoid using water or harsh chemicals, as these can corrode contacts or damage the housing.

• Avoid Mechanical Damage: Do not strike the contact or bend the plunger, as this can disrupt the switching mechanism and compromise safety functionality.

• High-Traffic Areas: Shopping malls, airports, or high-rise office buildings (12+ hours daily operation, 500+ door cycles per day) – replace every 2-3 years. Frequent mechanical activation and exposure to dust accelerate contact wear and spring fatigue.

• Medium-Traffic Areas: Residential buildings, hotels, or small offices (8-10 hours daily, 200-500 door cycles per day) – replace every 3-5 years.

• Low-Traffic Areas: Villas, industrial facilities, or low-occupancy buildings (4-6 hours daily, door cycles per day) – replace every 5-7 years, with semi-annual inspections.

• Safety Circuit Errors: Recurring “door not closed” or “interlock failure” error codes that persist after checking wiring and alignment – indicating contact bounce or internal wear.

• Intermittent Operation: The elevator fails to start randomly or stops unexpectedly (due to false contact opening) – a critical safety hazard.

• Physical Damage: Cracked housing, bent plunger, or corroded terminals – which can cause contact failure or short circuits.

• Reduced Contact Performance: Multimeter tests show contact resistance >100mΩ when closed, or inconsistent continuity – signs of contact oxidation or arcing damage.

• Stiff Plunger: The plunger fails to retract smoothly or feels stiff when pressed – indicating spring fatigue or debris buildup.

• Universal Compatibility: Designed to fit most elevator brands (Mitsubishi, KONE, Schindler, Otis, Fermator) and door lock assemblies, eliminating the need for custom modifications.

• Safety-Certified Design: Meets global safety standards for door interlock contacts, ensuring compliance with local elevator safety regulations and inspection requirements.

• Rigorous Quality Assurance: 100% pre-delivery testing, including contact resistance validation, mechanical endurance trials, and environmental stress testing.

• Expert Technical Support: Our team of elevator safety engineers provides professional guidance on installation, wiring, and troubleshooting via phone or email, ensuring a smooth user experience.

• Fast Delivery: We maintain a large inventory of KCB-R-5 door contacts to fulfill emergency replacement orders within 24-48 hours, minimizing elevator downtime.