Description
Elevator limit switch CR400-NZ CR400-NF Brief Introduction
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Product Name |
Elevator limit switch |
| Model Number | CR400-NZ
CR400-NF |
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Elevator Limit Switch CR400-NZ/CR400-NF – Nanjing Zhuye Elevatorparts
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The elevator leveling system is a key component that ensures the elevator car aligns accurately with the floor, providing safe and comfortable access for passengers. The elevator leveling sensor serves as the “eye” of this system, detecting the car’s position in real time. The Elevator Leveling Sensor TNC-121 provided by Nanjing Zhuye Elevatorparts is a high-precision position-sensing component tailored for mainstream elevator systems. It is widely compatible with elevator brands such as Schindler, OTIS, and KONE, suitable for both passenger and freight elevators. This sensor adopts advanced photoelectric sensing technology, featuring high detection accuracy, fast response speed, and strong anti-interference ability, ensuring the elevator stops stably and accurately at each floor. Crafted with high-quality optical components, sealed metal shells, and precision electronic circuits, it meets international elevator safety standards (EN 81-20, GB 7588) and has become a trusted choice for global elevator maintenance teams and manufacturers.
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The elevator limit switch is a critical safety component that prevents the elevator car from overtraveling, and its reliable operation is indirectly linked to the door machine pulley system (composed of drive and driven pulleys) by ensuring the elevator stops at safe positions. The Elevator Limit Switch Series (CR400-NZ, CR400-NF) launched by Nanjing Zhuye Elevatorparts are high-safety control devices tailored for mainstream elevator systems. They are widely compatible with renowned elevator brands such as Schindler, OTIS, and KONE, accurately detecting the car’s upper and lower limit positions and cutting off the running circuit in time to avoid accidents. Crafted with high-precision mechanical structures, corrosion-resistant shells, and high-sensitivity contact points, these limit switches meet international elevator safety standards (EN 81-20, IEC 60947) and have become a trusted choice for global elevator maintenance teams and manufacturers.
Nanjing Zhuye Elevatorparts has always adhered to the concept of “quality first, safety-oriented,” implementing strict quality control throughout the production process of the CR400-NZ and CR400-NF elevator limit switches. Each unit undergoes rigorous testing, including mechanical durability testing, contact on-off performance verification, corrosion resistance testing, and high-temperature resistance assessment. The switches adopt a precision snap-action structure with a response time of less than 0.03 seconds, ensuring timely circuit cutoff when the elevator reaches the limit position. The corrosion-resistant zinc alloy shell and IP65 dustproof and waterproof rating enable them to work stably in harsh environments such as elevator shafts with high humidity and dust. With a mechanical service life exceeding 2 million operations, these switches provide long-term reliable safety protection for elevators.
Usage Guide for Elevator Limit Switch CR400-NZ/CR400-NF
Correct installation, debugging, and maintenance of the CR400-NZ and CR400-NF limit switches are crucial to ensuring elevator operation safety and avoiding interference with the door machine pulley system. Nanjing Zhuye Elevatorparts emphasizes that only certified elevator maintenance technicians are allowed to perform installation and replacement operations.
1. Pre-Installation Preparation
1. Pre-Installation Preparation
First, confirm that the elevator’s MAC car lighting controller model matches the POWCV24181MH power supply (check parameters such as input voltage, output voltage, output current, and installation dimensions). Consult Nanjing Zhuye Elevatorparts’ technical team if there is any uncertainty about compatibility. Then, cut off the elevator’s main power supply and the secondary power supply for the car lighting system, lock the switch, and place a “Maintenance in Progress” warning sign at the elevator landing doors and machine room entrance. Locate the power supply installation position (usually on the car top or in the car control cabinet) and clean the area to remove dust, debris, and oil stains. Finally, prepare professional tools such as a screwdriver, wire stripper, multimeter, and insulation tester, and check that the new POWCV24181MH power supply from Nanjing Zhuye Elevatorparts is intact (no damage to the shell, no loose pins).
First, confirm that the elevator model matches the selected limit switch model (CR400-NZ/CR400-NF) by checking parameters such as installation dimensions, contact type, and rated voltage/current. Consult Nanjing Zhuye Elevatorparts’ technical team if there is any uncertainty about compatibility. Then, cut off the elevator’s main power supply and control system power supply, lock the switch, and place a “Maintenance in Progress” warning sign at the elevator entrance and shaft access door. Use a hoist to fix the elevator car at a safe position to expose the upper and lower limit switch installation areas. Finally, prepare professional tools such as a screwdriver, wrench, multimeter, and measuring tape; clean the installation area, and check the door machine’s drive and driven pulleys for normal operation (abnormal pulley operation may affect the elevator’s running stability and indirectly impact the limit switch’s trigger accuracy).
2. Installation & Wiring
Locate the original upper and lower limit switch positions in the shaft and take photos to record their installation height, trigger direction, and wiring connections for later reference. Disconnect the wires from the old switches according to the recorded labels and remove the old switches. Take the new limit switches (CR400-NZ/CR400-NF) from Nanjing Zhuye Elevatorparts, install them on the preset brackets, and fasten them firmly with screws. Adjust the switch’s installation height and trigger gap (usually 2-5mm) to ensure it can be accurately triggered when the elevator reaches the limit position. Connect the wires to the corresponding terminals strictly following the photos and the wiring diagram provided by Nanjing Zhuye—distinguish between power wires, signal wires, and ground wires to avoid wrong connection. After wiring, use a multimeter to test the contact on-off performance to confirm normal operation.
3. Usage & Daily Maintenance
Remove the hoist fixing the car, restore the power supply, and switch the elevator to inspection mode. Operate the elevator to slowly run to the upper and lower limit positions respectively, observing whether the CR400-NZ/CR400-NF limit switches are accurately triggered and the elevator stops immediately without overtravel. Check the elevator’s control panel—there should be no fault alarms related to the limit switch. After 1 hour of stable operation, check the switch’s temperature and wiring terminals (no abnormal heat or loose wires). For daily maintenance, inspect the switches during monthly shaft patrols: Check for loose brackets, deviation of trigger gap, and damage to the switch surface; clean the switch and trigger mechanism with a dry cloth to remove dust and debris. Every 3 months, recheck the contact on-off performance and installation height; every 6 months, inspect the fixing screws and adjust the trigger gap if necessary. At the same time, check the door machine pulley system’s operation—abnormal pulley wear may cause the elevator to run unsteadily, affecting the limit switch’s service life.
Replacement Cycle of Elevator Limit Switch CR400-NZ/CR400-NF
The replacement cycle of the CR400-NZ and CR400-NF limit switches is closely related to operating frequency and the working environment of the elevator shaft. Under normal circumstances (elevator daily operation 12-24 hours, shaft environment dry and low-dust, no frequent vibration), Nanjing Zhuye Elevatorparts recommends a replacement cycle of 3-4 years. This cycle is determined based on long-term field operation data and component aging tests, fully considering the wear of the mechanical structure, attenuation of contact sensitivity, and aging of the internal spring.
For elevators in high-traffic areas (e.g., large shopping malls, airports with daily operation ≥ 20 hours) or harsh environments (shaft with high humidity, heavy dust, large temperature fluctuations), the replacement cycle should be shortened to 1.5-2 years. High-frequency triggering accelerates the wear of the mechanical structure and contact points, while harsh environments cause component corrosion. For low-usage elevators (e.g., villa elevators, small office buildings with daily operation time < 8 hours) in stable environments, the cycle can be extended to 4-5 years, but only after inspection and confirmation by Nanjing Zhuye’s technicians that the switch’s performance and safety protection function meet standards.
Replace the limit switch immediately if any of the following issues occur, regardless of its service life: The switch fails to trigger or is triggered incorrectly, causing the elevator to overtravel; the contact points are severely oxidized or burned, resulting in unstable circuit connection; the mechanical structure is stuck or deformed, unable to return to its original position; the shell is severely damaged or corroded, losing protective performance; the switch causes frequent elevator safety alarms, and the fault cannot be eliminated after adjustment.
The Elevator Limit Switch Series (CR400-NZ, CR400-NF) from Nanjing Zhuye Elevatorparts integrate high reliability, durability, and strong compatibility, providing a critical safety guarantee for elevators and ensuring the stable operation of the door machine pulley system. By following the correct usage, maintenance, and replacement guidelines, you can effectively prevent elevator overtravel accidents, improve operation safety, and extend the service life of the entire elevator system. Choosing Nanjing Zhuye Elevatorparts means you get 100% authentic CR400-NZ and CR400-NF limit switches, as well as professional services including model matching, on-site installation guidance, and timely after-sales support. Trust Nanjing Zhuye Elevatorparts for the stable and safe operation of your elevator.
