Description
Otis elevator steel belt detection device steel belt detection head Brief introduction
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Product Name |
Otis elevator steel belt detection device AAA649J12/J11 AAA649J2/J1 steel belt detection head |
| Model Number |
AAA649J12/J11 AAA649J2/J1 |
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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 Elevator Steel-Belt Detection Device – Installation, Calibration & Replacement Guide
Nanjing Zhuye Elevator Parts – OEM stock, same-day dispatch, 24/7 support
Nanjing Zhuye Elevator Parts – OEM stock, same-day dispatch, 24/7 support
The steel-belt detection device (marketed as Otis SSS “Belt Monitor”, p/n GAA26850AB1) is the SIL-2 sentinel that guards every Gen2® and Gen2® Life machine. Mounted in the head sheave box, the unit scans the AAA717AM2 belt 2,000 times per second, counts broken cords, measures cross-section loss and signals the GECB to shut down if wear exceeds 5 %. A single misaligned sensor or dusty lens can trigger a “420” fault and take the elevator out of service. Nanjing Zhuye Elevator Parts keeps hundreds of factory-calibrated detection devices in Rotterdam and Nanjing so you can restore safe traction the same day. Below is an 800-word field manual that explains correct usage, on-car calibration and the replacement cycle that keeps your elevators code-compliant and passenger-safe.
1. What the detection device does
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Dual-channel inductive + optical sensors detect broken cords ≥1 mm
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24 Vdc supply, CAN-bus interface, 1 ms update rate
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IP65 housing resists oil, dust and 95 % RH
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Automatic zero-drift compensation –20 °C to +70 °C
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UL/CE certified to EN 81-20/50 and CSA B44.1 for 10-year design life
2. Tools to carry
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SSS detection device (Nanjing Zhuye part #OT-BELT-SSS-GAA26850AB1) in anti-static bag
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2 mm & 3 mm flat screwdrivers, TX10 Torx
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Otis Service Tool (OST) laptop with SSS 2.x licence
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RJ-45 to M12 adapter cable (2 m, shielded)
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IPA wipes and lint-free cloth
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Feeler gauges 0.05–0.2 mm
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Lock-out / tag-out kit
3. Installation – 20 minutes if you mark the gap
Safety: place the car on inspection, open the main disconnect and verify 0 V on the 24 Vdc rail.
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Photograph existing sensor bracket – note 3 mm target gap to belt edge.
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Remove two TX10 screws; unplug M12 connector and lift out the old unit.
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Clean belt surface with IPA – dust scatters the optical beam.
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Mount new device in same slot; gap must be 3.0 mm ±0.1 mm, parallel within 0.5°.
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Connect M12; route cable through EMC gland and secure with P-clips.
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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 → Belt → Auto-Learn; rotate sheave by hand until learn is 100 %.
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Run 3 full-speed cycles; verify “Belt OK” and deviation <1 %.
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Record serial number, date and gap value in CMMS.
4. Functional test – prove it to the controller
a) Broken-cord simulation: place 1 mm steel wire on belt; device must trip within 1 s.
b) Cross-section test: 5 % loss must raise “Maint” warning, 10 % must fault.
c) CAN-bus latency: <5 ms between trip and GECB reaction.
d) Temperature: housing <60 °C after 30 min run.
e) Export OST report and attach PDF to site file.
b) Cross-section test: 5 % loss must raise “Maint” warning, 10 % must fault.
c) CAN-bus latency: <5 ms between trip and GECB reaction.
d) Temperature: housing <60 °C after 30 min run.
e) Export OST report and attach PDF to site file.
5. Preventive maintenance schedule
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Monthly – visual sweep for dust on lens or loose M12 connector.
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Quarterly – measure 24 Vdc ripple (<100 mV) and gap (3.0 mm ±0.1 mm).
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Annually – clean lens with IPA; re-run auto-learn after track cleaning.
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Every two years – replace M12 gasket – prevents moisture ingress.
6. Replacement cycle – environment decides
Otis specification: 10 years. Nanjing Zhuye field analytics refine this:
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Light duty (<150 starts/day, clean 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 dust (parking garage, workshop): 6 years – optical window blinds.
Replace immediately if:
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STATUS LED red steady – internal CPU fault
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CAN-bus error frame count >1 % – transceiver cracked by vibration
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Gap drift >0.5 mm in one month – bracket fatigue
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Temperature alarm >70 °C – LED emitter degrades
7. Eco-disposal & warranty
Return the old unit in the prepaid anti-static box; Nanjing Zhuye recovers aluminium, copper and gold and issues a €10 recycling credit. Every detection device ships with a 24-month replacement warranty, extendable to 60 months when you join our annual lens-cleaning program.
8. Why buy from Nanjing Zhuye Elevator Parts
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650 units in stock, Rotterdam & Nanjing, ready for same-day courier
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Factory-sealed Otis packaging with hologram and calibration certificate – no grey-market clones
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QR code on box links to 3-minute alignment video and test form
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24/7 technical hotline staffed by ex-Otis belt specialists
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Bundle pricing: buy 5 devices and get a free lens-cleaning kit plus freight credit
9. Bottom line
A misaligned or dusty belt monitor is the fastest way to a shutdown call. Keep a genuine, pre-calibrated detection device on every truck, swap it in 20 minutes, and your Gen2 belts will stay under SIL-2 surveillance for the full 10-year design life. Order today from Nanjing Zhuye Elevator Parts – the fastest route from “belt fault” to “perfect ride.”
