Description
Otis Emergency Evacuation Device Door Control 3 Brief Introduction
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Product Name |
Otis Emergency Evacuation Device |
| Model Number |
Door Control 3 |
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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 Emergency Evacuation Device Door Control 3 – Unlocking Safety When Power Fails | Nanjing Zhuye Elevator Parts
A trapped passenger’s worst nightmare is hearing the fire alarm while the car sits between floors with sealed doors. Otis Door Control 3 (DC-3) is the micro-processor based door-management module inside the Otis C-DQ48VD evacuation system that overrides normal door locks, sequences the brake and motor, and delivers people to daylight in under 90 seconds. Nanjing Zhuye Elevator Parts stocks genuine DC-3 boards, complete with plug-and-play harness and firmware pre-flashed for Gen2® Switch, Gen2® Life and 4200 gearless controllers—ready for same-day despatch to any time zone.
What DC-3 does
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Monitors 24 V safety chain, brake contactor feedback and car position encoder while on battery power
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Decides whether to open doors immediately (within landing zone ±150 mm) or to move to nearest floor first
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Drives door-motor relay at reduced 24 VDC to conserve battery yet achieve 150 N opening force required by EN 81-20
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Provides soft-start / soft-stop ramp to prevent door rebound that could injure panicked passengers
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Logs every evacuation event (time stamp, floor reached, battery voltage, fault flags) into 8 kB EEPROM for later download
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Supports automatic, semi-auto and manual “door only” modes selectable on the 3.5-inch HMI
Hardware at a glance
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Silicone-coated PCB, conformal-coated both sides, flame class UL 94-V0
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Dual ARM Cortex-M0 MCUs running cross-check for SIL 3 compliance
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4 × digital inputs (safety chain, door zone, brake ACK, encoder index)
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3 × power outputs (door motor forward, reverse, brake lift) protected by 8 A smart high-side switches with over-temp and short-circuit feedback
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Galvanically isolated RS-485 port for real-time diagnostics and firmware update
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Operating temperature −10 °C to +70 °C, humidity 5–95 % RH non-condensing
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Otis part number 71390001-D03, backward compatible with −D01 and −D02 when dip-switch S1 is set to “Legacy”
Installation & wiring (15-minute swap)
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Lock main breaker OFF; wait 5 min for DC bus to discharge below 50 V.
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Open evacuation cabinet; photograph existing wire positions.
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Withdraw DC-3 by pressing top and bottom plastic clips; lift straight out to avoid bending 48-pin header.
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Insert new DC-3 until latches click—no tools required.
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Restore power; HMI will display “DC-3 Detected v3.04”.
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Perform auto-addressing: Menu → Service → Door Ctrl → Auto Learn. Board cycles outputs and stores safety-chain polarity.
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Run simulated evacuation: press “TEST”, car must move to nearest floor and open doors on battery within 60 s.
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Download event log via mini-USB port; save PDF report for compliance file.
Replacement cycle & maintenance
Although DC-3 contains no moving parts, its semiconductor outputs and electrolytic capacitors age with temperature cycles and electrical stress. Otis service bulletin SB-2023-11 recommends:
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Visual inspection every 6 months: look for burnt odour, discoloured copper or swollen relay base.
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Functional test every 12 months: 2 complete evacuation cycles; verify door opens ≥ 800 mm in ≤ 3 s and brake drops within 0.3 s.
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Replace entire board every 8 years or 15 000 evacuation cycles, whichever comes first.
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Immediate replacement if:
– HMI shows “Door Control Fault” with red LED steady,
– doors fail to unlock on battery although motor runs,
– log reveals repeated “Over-current Output 2” > 6 A,
– RS-485 communication lost (no firmware version visible).
Battery caveat
A weak battery can masquerade as a DC-3 fault. Always confirm battery voltage > 46 V under 10 A load before condemning the board. 30 % of returned boards test good on the bench because technicians overlooked the 5-year battery replacement rule.
Maintenance tips from Nanjing Zhuye Elevator Parts
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Keep spare DC-3 in original anti-static bag until use; MOS outputs are ESD sensitive.
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After lightning storms, check RS-485 termination resistor (120 Ω) – surges often open the resistor and crash communication.
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Never flash firmware older than v3.02 on boards built after 2023; downgrade corrupts the dual-MCU handshake.
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Label the inside of the cabinet door with replacement date; our QR sticker auto-loads the test procedure when scanned.
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Order the complete “DC-3 Kit” (board + harness + desiccant pack) from Nanjing Zhuye Elevator Parts to eliminate loose-pin faults that appear months later.
Why buy from us?
As an Otis-authorised emergency-products distributor, we import DC-3 boards directly from the Czech Republic factory, pre-register serial numbers for warranty, and ship with a 24-month replacement guarantee. Stock is held in climate-controlled cabinets to prevent capacitor ageing. Orders placed before 15:00 China time leave the same evening via DHL Express, arriving Europe or North America in 2–4 days. Bulk pricing starts at five pieces; we can pre-load site-specific parameters and include a loaner board to keep your lifts running during the swap.
Conclusion
The Door Control 3 is the brain that converts battery energy into safe passenger freedom. By replacing it on schedule and testing it relentlessly, you ensure that when the building goes dark, the doors still open and people walk out unharmed. Specify genuine Otis DC-3 from Nanjing Zhuye Elevator Parts today—because in an emergency, every millisecond of door movement counts.
