Description

1. What the OMB4351ANY does

• 24 Vdc key-switch input with debounce and 5 ms filter
• Dual-channel SIL-2 relay output, 2 A, 250 Vac, force-guided contacts
• Red “EMERGENCY” halo, 150 cd/m², 170° viewing angle
• On-board 5 Vdc buck, 2 A, short-circuit and thermal protected
• IP42 ABS housing, 18 mm depth, key-hole slots for 30-second swap
• UL/CE recognised to EN 81-20/50 and CSA B44.1 emergency release clauses

2. Tools to carry

• Emergency release board OMB4351ANY (Nanjing Zhuye part #OT-ERB-OMB4351ANY-EMG) in anti-static bag
• 2 mm & 3 mm flat screwdrivers, TX10 Torx
• Otis Service Tool (OST) laptop with Emergency plug-in licence
• RJ-45 to M12 adapter cable (2 m, shielded)
• IPA wipes and lint-free cloth
• Lock-out / tag-out kit

3. Installation – 10 minutes if you label the wires
   Safety: place the car on inspection, open the main disconnect and verify 0 V on the 24 Vdc rail.

1. Photograph every J-connector – note J1 (24 V), J2 (CAN), J3 (key-switch), J4 (halo), J5 (relay).
2. Depress the bezel latches and hinge the COP mask forward; store screws in magnetic tray.
3. Slide the old board upward; it unhooks from the plastic dovetail.
4. Clean the bezel and gasket with IPA; remove any glue residue.
5. Fit the new OMB4351ANY: hook top edge first, press until latch clicks.
6. Re-connect all plugs; tug-test each one.
7. Apply power – STATUS LED blinks green 3 times then solid; halo shows “EMERGENCY”.
8. Insert emergency key; confirm relay clicks and controller enters rescue mode.
9. Record serial number, date and activation time in CMMS.

4. Functional test – prove it to the inspector
   a) Key-switch debounce: <5 ms contact bounce.
   b) Relay contact resistance: <0.1 Ω at 2 A test current.
   c) Halo brightness: 150 cd/m² measured with lux meter.
   d) Rescue mode entry: <100 ms from key turn to controller acknowledgement.
   e) Export OST report and attach PDF to site file.
5. Preventive maintenance schedule

• Monthly – press TEST button; halo must illuminate and relay click.
• Quarterly – measure 24 Vdc ripple (<100 mV) and CAN-bus termination (60 Ω).
• Annually – clean key-switch with IPA; inspect for carbon tracks from arcing.
• Every two years – replace the anti-scratch lens film – keeps display crystal-clear.

6. Replacement cycle – traffic and vandalism decide
   Otis specification: 10 years. Nanjing Zhuye analytics refine this:

• Light duty (<150 starts/day, clean office): 12 years
• Standard duty (150–400 starts, residential): 10 years
• Heavy duty (>400 starts, hospital, mall): 8 years
• High vandalism (school, station): 5 years – key-switch and lens crack under impact.

• Relay contact resistance >0.5 Ω – arcing pits
• Halo brightness <50 % – LED chain degradation
• CAN-bus error frame count >1 % – transceiver cracked by vibration
• Housing cracks exposing live parts – safety violation

7. Eco-disposal & warranty
   Return the old board in the recycling envelope; Nanjing Zhuye recovers gold, copper and ABS and issues a €5 recycling credit. Every OMB4351ANY ships with a 24-month replacement warranty, extendable to 60 months when you join our annual lens-replacement program.
8. Why buy from Nanjing Zhuye Elevator Parts

• 3,000 units in stock, Rotterdam & Nanjing, ready for same-day courier
• Factory-sealed Otis packaging with hologram – no grey-market clones
• QR code on bag links to 90-second install video and relay test sheet
• 24/7 technical hotline staffed by ex-Otis emergency specialists
• Bundle pricing: buy 10 boards and get a free emergency key-switch plus freight credit

9. Bottom line
   A faulty emergency release board is the fastest way to a locked-out elevator. Keep genuine OMB4351ANY units in every service kit, swap them in 10 minutes, and your elevators will stay rescue-ready, bright and compliant for the full 10-year design cycle. Order today from Nanjing Zhuye Elevator Parts – the fastest route from “emergency fault” to “perfect rescue.”

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