Description

Elevator Motherboard Power Supply WS50-4BAC-S – Usage, Replacement Cycle & Maintenance Guide
By Nanjing Zhuye Elevatorparts

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Introduction
The WS50-4BAC-S elevator motherboard power supply is a high-efficiency, switch-mode unit designed to deliver stable 50 V @ 4 A for elevator control systems, door operators, and safety circuits. Manufactured and distributed worldwide by Nanjing Zhuye Elevatorparts, this IP54-rated unit meets EN 81-20/50, ASME A17.1 and UL standards, ensuring reliable operation and minimal downtime.

1. Product Highlights
– Output: 50 V DC @ 4 A, 200 W continuous
– Input: 100–240 V AC, 50/60 Hz, <2 A
– Efficiency: 94 %, <30 mV ripple
– Protection: OVP, OCP, SCP, OTP
– Rating: IP54, -10 °C to +70 °C
– Life: 100,000 h @ 40 °C, 70 % load

2. Installation Method
Step 1 – Preparation
De-energise the control cabinet; lock-out/tag-out and verify zero energy. Record serial number and date code.

Step 2 – Mounting
Position supply on DIN rail or back-panel, 100 mm clearance for airflow. Use M4 screws (torque 1.2 N·m); ensure earth connection ≥2.5 mm².

Step 3 – Wiring
– Input: L/N/PE via 10 A breaker
– Output: 50 V DC to control bus (4 A max)
– Remote: Optional inhibit signal (5 V logic)
Maintain 50 mm separation from power cables.

Step 4 – Commissioning
Power-up; LED green. Measure output (50 V ±0.2 V), ripple (<30 mV). Log settings and date.

3. Daily & Preventive Maintenance
Daily (Technician)
Visual check – LED green, no audible noise, temperature <70 °C.

Monthly
Clean IP54 grille; check M4 screws tight. Measure 50 V rail (±0.2 V).

Quarterly
Download fault log; check ripple (<30 mV). Cycle remote inhibit 50×.

Annually
Replace fan every 5 years. Full load test at 150 % rated current for 10 s.

4. Replacement Cycle & Indicators
| Duty Cycle | Replace Every | Hours | Warning Signs |
| Standard residential | 8–10 years | 80k | LED amber, >70 °C case |
| Commercial / hospital | 5–7 years | 60k | Ripple >50 mV, >4 A draw |
| High-speed / outdoor | 3–5 years | 40k | Fan failure, IP54 failure |

Replace immediately if:
– Output drift >0.5 V or ripple >50 mV
– Repeated “power fault” alarms
– Physical damage or water ingress (IP54 compromised)

Maintain one spare WS50-4BAC-S per 25 power supplies for <4-hour response.

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 voltages for OEM projects

6. Conclusion
The WS50-4BAC-S power supply is the “heartbeat” of every elevator control system. By following the installation, testing, and replacement guidelines—and sourcing only from Nanjing Zhuye Elevatorparts—you guarantee code compliance, reduce downtime, and ensure every elevator stops exactly where it should.