Description

Elevator Door Motor TN-YTTD250C – Usage, Replacement Cycle & Maintenance Guide
By Nanjing Zhuye Elevatorparts

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Introduction
The **TN-YTTD250C** is a high-performance, 3-phase, 24 V DC door operator motor engineered for modern elevator systems. Manufactured and distributed worldwide by Nanjing Zhuye Elevatorparts, this unit meets EN 81-20/50, ASME A17.1 and UL standards, delivering smooth, energy-efficient door motion with minimal noise and vibration. This 800-word guide covers correct installation, daily operation, and the recommended replacement cycle to keep every elevator door safe, smooth and code-compliant.

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1. Product Highlights
– Power: 24 V DC, 6 A peak, 250 W output
– Speed: 0–2.5 m/s, encoder feedback 1024 PPR
– Torque: 2.5 Nm continuous, 6 Nm peak
– Bearing: Dual ball-bearing, 50,000 h @ 40 °C
– Housing: IP55 aluminium, anti-corrosion coating
– Life: 1+ million door cycles

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2. Installation Method
Step 1 – Preparation
De-energise the door drive; lock-out/tag-out and verify zero energy. Record serial number and encoder value.

Step 2 – Mounting
Position motor on operator bracket; align shaft to encoder coupling. Use M6 screws (torque 10 N·m); ensure 5 mm clearance for airflow.

Step 3 – Wiring
– Power: 24 V DC (red/black)
– Encoder: 5-core shielded to DCU
– Earth: ≥2.5 mm² PE conductor
Maintain 50 mm separation from power cables.

Step 4 – Commissioning
Run auto-tune; verify speed ripple <2 %, current <6 A. Log parameters and date.

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3. Daily & Preventive Maintenance
Daily (Technician)
Visual check – no abnormal noise, vibration, or overheating.

Monthly
Clean IP55 grille; check M6 screws tight. Measure 24 V rail (±1 V).

Quarterly
Download fault log; check encoder drift (<0.5 mm). Cycle E-stop 50×.

Annually
Replace bearings every 40,000 h. Full load test at 150 % rated torque for 10 s.

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4. Replacement Cycle & Indicators
| Duty Cycle | Replace Every | Hours | Warning Signs |
| Standard residential | 8–10 years | 40k | Vibration >2 g, temp >70 °C |
| Commercial / hospital | 5–7 years | 30k | Bearing rattle, >8 A current |
| High-speed / freight | 3–5 years | 20k | Encoder drift, IP55 failure |

Replace immediately if:
– Repeated “motor fault” or “encoder fault”
– Physical damage or water ingress (IP55 compromised)
– Shaft run-out >0.1 mm or bearing seizure

Maintain one spare TN-YTTD250C per 20 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 extended warranty options

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6. Conclusion
The TN-YTTD250C door motor is the “muscle” behind every smooth door movement. By following the installation, testing, and replacement guidelines—and sourcing only from Nanjing Zhuye Elevatorparts—you guarantee code compliance, reduce downtime, and ensure every passenger enters and exits safely.