Description
OTIS AT120 R Lift Door Controller FAA24350BK1 Brief introduction
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Product Name |
OTIS AT120 R Lift Door Controller |
| Model Number |
FAA24350BK1 |
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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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OTIS Lift Door Controller AT120R – Setup, Tuning & Replacement Guide
Nanjing Zhuye Elevator Parts – OEM stock, global shipping, 24/7 support
Nanjing Zhuye Elevator Parts – OEM stock, global shipping, 24/7 support
The AT120R is the compact, high-performance door controller that drives every modern OTIS AT120-family operator—Gen2®, SkyRise® and HydroLift®. Producing up to 2.2 kW of variable-frequency power from a 24 Vdc logic bus, this board converts digital commands into smooth S-curve door motion: 1.5 s opening, 1.0 s closing with 150 N nudge torque. A single shorted IGBT or a cracked encoder header will throw a “420” or “423” fault and park the car. Nanjing Zhuye Elevator Parts keeps hundreds of factory-tested AT120R controllers in Rotterdam and Nanjing so you can restore whisper-quiet door motion the same day. Below is an 800-word field manual that explains correct usage, on-car tuning and the replacement cycle that keeps your elevators smooth, safe and code-compliant.
1. What the AT120R does
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2.2 kW IGBT inverter, 0–230 Vac, 0–99 Hz, vector control
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32-bit ARM Cortex-M7, 2 ms control loop, SIL-2 safety task
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Incremental encoder input (A/B/Z) and 24 Vdc brake output
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On-board 24 Vdc buck, 3 A, short-circuit and thermal protected
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UL/CE listed to EN 81-20/50 and CSA B44.1 for 10-year design life
2. Tools to carry
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AT120R controller (Nanjing Zhuye part #OT-AT120R-VER-7.1) in anti-static box
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2 mm & 3 mm flat screwdrivers, TX10 & TX15 Torx
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Otis Service Tool (OST) laptop with AT120 plug-in licence
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Oscilloscope or power analyser
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Torque wrench (2–25 N·m)
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Lock-out / tag-out kit
3. Installation – 30 minutes if you copy the parameters
Safety: place the car on inspection, open the main disconnect and wait 5 min for DC bus to discharge (<5 V).
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Photograph every connector – note X1 (24 V), X2 (motor), X3 (encoder), X4 (CAN), X5 (brake).
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Remove four TX15 screws; slide the old board out of the plastic stand-offs.
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Check the heat-sink pad – if torn, replace with new 0.5 mm thermal sheet supplied.
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Mount the new AT120R; torque screws to 1.2 N·m.
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Re-connect all plugs; tug-test each one.
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Power up – STATUS LED blinks green 3 times then solid; CAN LED flashes every 100 ms.
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Launch OST → Door → Parameter Upload; select the XML file exported earlier.
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Run auto-tune: the controller learns motor resistance, inductance and encoder offset.
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Cycle the door 5 times; verify open time 1.5 s ±0.1 s and nudge torque 150 N ±10 N.
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Record serial number, date and tune values in CMMS.
4. Functional test – prove it to the inspector
a) No-load current: 1.8 A ±0.2 A per phase at 50 Hz.
b) Encoder count: 1,024 ppr, no missing ticks.
c) Door open time: 1.5 s ±0.1 s at 0.5 m/s car speed.
d) Nudge torque: 150 N ±10 N measured at leading edge.
e) Export OST report and attach PDF to site file.
b) Encoder count: 1,024 ppr, no missing ticks.
c) Door open time: 1.5 s ±0.1 s at 0.5 m/s car speed.
d) Nudge torque: 150 N ±10 N measured at leading edge.
e) Export OST report and attach PDF to site file.
5. Preventive maintenance schedule
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Monthly – visual sweep for burnt smell or swollen DC-bus capacitors.
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Quarterly – measure heat-sink temperature <55 °C with IR gun.
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Annually – scope the PWM outputs; shoot-through spikes must be <50 V.
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Every two years – replace the 470 µF, 450 V capacitor – ESR doubles every 5 years.
6. Replacement cycle – duty and temperature decide
OTIS specification: 10 years. Nanjing Zhuye analytics refine this:
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Light duty (<150 starts/day, office): 12 years
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Standard duty (150–400 starts, residential): 10 years
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Heavy duty (>400 starts, hospital, mall): 8 years
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High ambient (>40 °C, rooftop MRL): 6 years – capacitor life halves every 10 °C rise.
Replace immediately if:
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STATUS LED red double-blink – IGBT desaturation fault
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DC bus droops below 300 V under load – capacitor ESR too high
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Burn mark around IGBT terminals – heat-sink paste dried out
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Door current >4 A – shorted winding or failing IGBT
7. Eco-disposal & warranty
Return the old controller in the recycling box; Nanjing Zhuye recovers aluminium, copper and gold and issues a €20 recycling credit. Every AT120R ships with a 24-month replacement warranty, extendable to 60 months when you join our annual capacitor-replacement program.
8. Why buy from Nanjing Zhuye Elevator Parts
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280 units in stock, Rotterdam & Nanjing, flashed with latest firmware
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Factory-sealed OTIS packaging with hologram – no grey-market clones
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QR code on box links to parameter template and 5-minute tuning video
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24/7 technical hotline staffed by ex-OTIS door specialists
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Bundle pricing: buy 5 controllers and get a free heat-sink pad kit plus freight credit
9. Bottom line
A failed door controller is the fastest way to a trapped-passenger call. Keep a genuine, pre-flashed AT120R on every truck, swap it in 30 minutes, and your doors will open and close like new for the full 10-year design life. Order today from Nanjing Zhuye Elevator Parts – the fastest route from “fault code” to “fault-free.”
