Description

OTIS AT120 Door Motor FAA24350BL2 Brief introduction

1. What the FAA24350BL2 does

• 0.75 kW S1, 1.5 kW S5-60 % peak, 3.2 Nm rated torque at 3,000 rpm
• Integrated 1,024 ppr incremental encoder + electronic nameplate for auto-tuning
• Class-F insulation (155 °C) qualified for 40 °C ambient hoist-ways
• IP55 cast-aluminium frame with forced-cooling fan 24 Vdc, 0.25 A
• UL/CE listed to EN 81-20/50 and CSA B44.1 for 10-year design life

2. Tools to carry

• FAA24350BL2 motor (Nanjing Zhuye part #OT-MOT-FAA24350BL2) with fan and encoder cable
• 4 mm & 5 mm Allen keys, 13 mm socket and torque wrench
• Otis Service Tool (OST) laptop with AT120 plug-in licence
• Oscilloscope or power analyser
• Dial gauge (0–10 mm) and soft mallet
• Motor lifting sling rated 50 kg
• Lock-out / tag-out kit

3. Installation – 45 minutes with a lifting sling
   Safety: place the car on inspection, open the main disconnect and wait 5 min for DC bus to discharge (<5 V).

1. Photograph power, encoder and fan connectors.
2. Support the door operator with a wooden block; attach sling to motor eyes and raise until coupling is unloaded.
3. Remove four M8 flange bolts; slide motor backwards 30 mm and lower to pallet.
4. Check coupling insert – replace if radial cracks >2 mm or spider shore-A >90.
5. Position new FAA24350BL2; align shaft to within 0.05 mm TIR using dial gauge.
6. Torque flange bolts to 25 N·m in diagonal pattern.
7. Connect power (U/V/W), encoder (X131) and fan (X20); tug-test each.
8. Power up – OST should show “Motor Ready” and 0 rpm at standstill.
9. Run auto-tune: controller learns resistance, inductance and encoder offset.
10. Record serial number, date and alignment values in CMMS.

4. Functional test – prove it to the drive
   a) No-load current: 1.2 A ±0.2 A per phase at 50 Hz.
   b) Encoder count: 1,024 ppr, no missing ticks, jitter <50 ns.
   c) Door open time: 1.5 s ±0.1 s at 0.5 m/s car speed.
   d) Temperature rise: <60 K above ambient after 30 min run.
   e) Export OST report and attach PDF to site file.
5. Preventive maintenance schedule

• Monthly – visual sweep for oil leaks at seal and fan noise.
• Quarterly – measure winding insulation >100 MΩ at 500 Vdc.
• Annually – check coupling alignment; re-torque bolts to 25 N·m.
• Every two years – replace fan (24 Vdc, 0.25 A) – bearing failure is the #1 cause of overheating.

6. Replacement cycle – duty and environment decide
   OTIS specification: 10 years. Nanjing Zhuye analytics refine this:

• Light duty (<150 starts/day, office): 12 years
• Standard duty (150–400 starts, residential): 10 years
• Heavy duty (>400 starts, hospital, mall): 8 years
• High ambient (>40 °C, rooftop MRL): 6 years – insulation life halves every 7 °C rise.

• Winding insulation <10 MΩ – moisture ingress
• Encoder jitter >200 ns – cracked disk or loose set-screw
• Bearing noise >65 dB(A) or temperature >80 °C
• Coupling radial run-out >0.1 mm – risk of encoder mis-alignment

7. Eco-disposal & warranty
   Return the old motor on the supplied pallet; Nanjing Zhuye recovers copper, aluminium and rare-earth magnets and issues a €40 recycling credit. Every FAA24350BL2 ships with a 24-month replacement warranty, extendable to 60 months when you join our annual alignment-check program.
8. Why buy from Nanjing Zhuye Elevator Parts

• 180 units in stock, Rotterdam & Nanjing, ready for same-day LTL dispatch
• Factory-sealed OTIS packaging with hologram and electronic nameplate – no grey-market clones
• QR code on nameplate links to wiring diagram and 5-minute tuning video
• 24/7 technical hotline staffed by ex-OTIS door specialists
• Bundle pricing: buy 2 motors and get a free coupling insert plus freight credit

9. Bottom line
   A noisy or overheating door motor is the fastest way to a shutdown call. Keep a genuine FAA24350BL2 on standby, swap it in 45 minutes, and your AT120 operators will deliver silent, efficient rides for the full 10-year design life. Order today from Nanjing Zhuye Elevator Parts – the fastest route from “drive fault” to “perfect close.”

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