Description

Elevator Emergency Leveling Device CB-550-2A
Usage, Replacement Cycle & Maintenance Guide
by Nanjing Zhuye Elevatorparts

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Introduction
The CB-550-2A emergency leveling device is a battery-backed UPS module that drives elevator cars to the nearest floor and opens doors during mains failure. Engineered by Nanjing Zhuye Elevatorparts, it meets EN 81-20/50, ASME A17.1 and local rescue codes, ensuring passenger safety and building compliance. This 800-word guide covers correct installation, daily operation, and the recommended replacement cycle to keep every lift rescue-ready.

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1. Product Highlights
– Output: 550 VA, 24 V DC, 2 A continuous
– Battery: Maintenance-free 24 V/12 Ah, 5-year design life
– Charging: Smart 3-stage, <4 h recharge
– Monitoring: RS-485, LED status, audible fault
– Rating: IP20, –10 °C to +45 °C, 95 % RH
– Cycles: 1,000+ rescue cycles @ 100 % load

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2. Installation Method
Step 1 – Preparation
De-energise main supply; lock-out/tag-out. Record serial number and battery date code.

Step 2 – Mounting
Position CB-550-2A in machine room <1 m from inverter. Use M6 screws (torque 10 N·m); ensure 100 mm airflow clearance.

Step 3 – Wiring
– Input: 230 V AC L/N/PE via 10 A breaker
– Output: 24 V DC to motor/inverter terminals
– Signal: RS-485 A/B to controller
Earth conductor ≥2.5 mm²; maintain 50 mm separation from power cables.

Step 4 – Commissioning
Power-up; LED green. Run simulated blackout: car must level and open within 30 s. Log trip time and date.

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3. Daily & Preventive Maintenance
Daily (Building Staff)
Visual check – LED green, no audible alarms. Ensure ventilation clear.

Monthly
Measure battery voltage (24 V ±1 V) and current (<2 A float). Clean IP20 grille.

Quarterly
Run 30-second blackout test; log trip time, battery temp. Cycle contactor 50×.

Annually
Replace battery if >3 years or capacity <80 %. Full 2-minute load test at 100 % VA.

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4. Replacement Cycle & Indicators
| Component | Replace Every | Warning Signs |
| Battery | 3–5 years | Voltage <22 V, swelling, leaks |
| Capacitor | 6–8 years | Bulging, >70 °C case |
| Contactor | 1 M cycles | Contact welding, >100 mΩ |

Replace immediately if:
– Rescue time >30 s or incomplete levelling
– Repeated “battery low” or “inverter fault” alarms
– Physical damage or water ingress (IP20 compromised)

Maintain one spare CB-550-2A per 25 elevators for <4-hour response.

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5. Why Choose Nanjing Zhuye Elevatorparts?
• Full traceability – laser-etched serial & QR code
• Same-day global dispatch via DHL/FedEx Express
• 24/7 multilingual hotline and on-site training
• Competitive tiered pricing and custom battery sizes for OEM projects

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6. Conclusion
The CB-550-2A emergency leveling device is the ultimate “rescue insurance” for every elevator. By following the installation, testing, and replacement guidelines—and sourcing only from Nanjing Zhuye Elevatorparts—you guarantee code compliance, reduce liability, and ensure every passenger exits safely during a power outage.