Description
Mitsubishi Elevator Door Operator Board DOR-1321A Brief introduction
| Mitsubishi Elevator Door Operator Board | |
| Brand | Original |
| Model | DOR-1321A /DOR-1231B/DOR-1241A |
| Goods No. | PE2401 |
| MOQ | 1 |
| Warranty Time | 1 year |
| Certificates | ISO9001 |
| Brand | Mitsubishi |
Mitsubishi Door Operator Board DOR-1321A – Precision Control for Every Door Cycle | Nanjing Zhuye Elevator Parts
A silent, swift door movement is the first mark of a quality elevator. Behind the scenes, the Mitsubishi DOR-1321A board calculates torque curves, monitors safety edges and drives the VVVF motor inverter in real time. When it falters, doors can rebound, nudge continuously or stall open. Nanjing Zhuye Elevator Parts stocks genuine DOR-1321A assemblies, flashed with the latest firmware and ready for same-day despatch to any continent, helping contractors restore perfect door motion without costly OEM delays.
Product snapshot
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Mitsubishi factory part number DOR-1321A, revision C3, firmware bundle MD-7.4
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32-bit RISC MCU + DSP dual-core, 120 MHz, SIL-3 cross-check
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3-phase 230 V output, 0-120 Hz, 2.2 kW, sine-wave PWM, 4 kHz carrier
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On-board 24 V logic supply, 3 A, short-circuit and overload protected
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6 digital inputs: open command, close command, light-barrier, nudging, fire-service, encoder index
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4 digital outputs: motor forward, motor reverse, brake, fault relay
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Encoder port: incremental 5 V or 12 V, single-ended or differential, up to 100 kHz
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CAN 2.0B interface for real-time torque, speed and health telemetry
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Operating temperature −10 °C to +70 °C, conformal-coated both sides, UL 94-V0
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IP20 aluminium heat-sink, 280 × 160 × 40 mm, 0.9 kg, plug-in header, hot-swap compatible
Where it works
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Mitsubishi LEHY-II, LEHY-M, MAXIEZ and NEXIEZ MRL side-opening and centre-opening doors
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Door motors 0.2–1.5 kW, 4-pole asynchronous or PMSM with 1 024 ppr encoder
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Modernisation packages replacing obsolete DOR-1210 or relay-logic controllers
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Any Mitsubishi door system expecting < 1 % speed ripple and ±3 mm repeat accuracy
Installation method – 15-minute field swap
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Place lift on inspection mode; stop at mid-shaft for easy reach.
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Switch OFF main breaker and door-operator isolator; lock & tag.
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Wait 3 min for DC bus to discharge (< 50 V indicated on LED).
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Photograph existing wiring; note encoder plug orientation.
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Release two side latches; slide old board out of guide rails.
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Insert new DOR-1321A until latches click—no tools required.
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Re-connect motor phases U/V/W, brake, encoder, 24 V logic, CAN-H/L.
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Power up; green “PWR” LED must illuminate within 3 s, MCU LED blinks blue.
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Launch Mitsubishi Door Tool (MDT-7) on laptop; auto-tune detects motor parameters in 90 s.
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Run 30 continuous door cycles; verify temperature < 60 °C on heat-sink and no fault codes.
Replacement cycle & preventive maintenance
Although solid-state, door-operator electronics live in a harsh world—vibration, brake dust, summer heat and voltage spikes. Mitsubishi service bulletin SB-MEL-2024-03 recommends:
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Visual inspection every 6 months: clean dust from fan guard, check for swollen DC-link capacitors.
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Measure IGBT Vce sat < 1.5 V at 50 A; replace if > 2.0 V.
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Capacitor reform every 8 years or 30 000 operating hours; if ESR > 150 % of nominal, replace entire board.
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Replace cooling fan (24 V, 80 mm ball-bearing) every 4 years—bearing lock is #1 cause of thermal shutdown.
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Immediate replacement if:
– HMI shows “Over-current 03” at start-up (IGBT short),
– DC-bus ripple > 5 V under load,
– heat-sink temperature > 70 °C with clean filter,
– CAN communication lost (blue LED dark).
Pro tip: 65 % of premature failures are traced to loose motor terminals—re-torque to 1.8 Nm every year.
Maintenance tips from Nanjing Zhuye Elevator Parts
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Always use shielded encoder cable, foil facing inward, grounded at board only, to prevent Hall-sensor noise.
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Never run motor cables in the same trunking as 230 V mains—induced spikes kill gate drivers.
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Keep a spare DOR-1321A in every service van; at 0.9 kg it fits in a lunchbox and saves a night call.
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After lightning storm, check DC-bus voltage ripple < 3 V; mains sag forces higher current and overheats IGBTs.
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Order the “Door Bundle” (board + fan + thermal paste) from Nanjing Zhuye Elevator Parts to eliminate parts hunting and ensure matched components.
Why buy from Nanjing Zhuye Elevator Parts?
We are a Mitsubishi-authorised distributor, importing DOR-1321A directly from the Nagoya factory, pre-loading firmware MD-7.4 and testing every unit on a 1.5 kW motor rig for 45 min under full load. Boards are shipped in anti-static foam with a 24-month replacement warranty. Our 3 000 m² Nanjing warehouse holds 150+ units year-round; 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 three pieces; we can pre-program motor parameters and include a loaner board to keep your lifts running during the swap.
Conclusion
The DOR-1321A inverter board is the silent virtuoso behind every smooth door movement. By installing the genuine Mitsubishi unit, following the torque schedule and replacing it before capacitors age, you eliminate door reversals, noise complaints and costly entrapments. Stock genuine DOR-1321A from Nanjing Zhuye Elevator Parts today—because when door motion fails, the whole building notices.
