Description
Otis Elevator OMU
DBA26800H2 Brief Introduction
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Product Name |
Otis Elevator OMU |
| Model Number |
DBA26800H2 |
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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 OMU DBA26800H2 – The 75 kW Power Brain That Turns 400 V into Whisper-Quiet Rides
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Every silky acceleration in an Otis SkyRise®, Gen2-R2® or super-MRL lift begins with a green, A4-sized powerhouse hidden inside the controller — the OMU DBA26800H2. This 75 kW, four-quadrant IGBT module drives permanent-magnet motors while regenerating up to 95 % of braking energy back to the mains. Originally engineered for 2.5–6.0 m s⁻¹ gearless machines, it is now the universal retrofit for any controller demanding silent, energy-saving performance. Nanjing Zhuye Elevator Parts keeps factory-sealed H2 units in anti-static stock for next-day despatch. Below we explain what the OMU does, how to commission it in under 30 minutes, and the replacement cycle that prevents expensive “OMU Fault” call-backs.
1. What DBA26800H2 Really Is
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Power Section: 3 × 380–480 VAC, 150 A continuous, 200 % for 60 s
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Output: 3 × 0–400 VAC, 0–100 Hz, 75 kW (100 kW peak)
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Control: 32-bit DSP, vector torque loop 50 µs, speed loop 500 µs
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Technology: 4-quadrant IGBT with integrated brake chopper, 95 % regeneration
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Interfaces: CAN-open 1 Mbit/s + 0–10 V speed reference, incremental encoder 8,192 ppr
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Protection: IP20 PCB, over-current, over-temp, under-voltage, short-circuit
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Size: 300 × 200 × 55 mm — DIN-rail or chassis mount
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Firmware: pre-loaded V12.06; checksum matches Otis original 0x9C7E
If the OMU trips, the car coasts, the display shows “OMU Fault” and the controller logs “EF9 Drive Over-Current”.
2. Where It Is Used
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Otis SkyRise®, Gen2-R2® 2.5–6.0 m s⁻¹ with PM machines 45–75 kW
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Thyssen TCM-MC3 retrofit kits
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Chinese super-MRL controllers with 400 V class motors
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Suitable for 1–64 floors, simplex or group (≤8 cars)
3. Commissioning – 30-Minute Plug-and-Play
Safety: lock main breaker, discharge DC bus <50 V, tag out.
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Remove old H2 — undo 6 DIN-rail clips; unplug 100-way ribbon, 8-way CAN, 6-way motor.
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Inspect bus bars — if burnt >1 mm, replace copper (Nanjing Zhuye part CB-BUS-150A).
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Insert H2 — snap until latches click; reconnect all keyed plugs.
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Connect brake resistor to B+/B-; set jumper J3 to “400 V 2 Ω”.
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Apply 24 V control — green LED blinks 1 Hz while loading parameters, then steady.
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Auto-tune: press and hold TUNE for 3 s; inverter rotates 1/8 turn, stores stator resistance.
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Run full-speed inspection — verify current <110 % rated, regeneration 95 %.
No oscilloscope is required; firmware is pre-flashed to match Otis checksum.
4. Daily Operation – What the OMU Actually Does
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Updates torque every 50 µs; speed ripple <0.02 % — passengers feel nothing
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Auto-compensates for rope stretch; stores creep data every trip
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Built-in 24 h self-test — if DC bus ripple >5 V, “OMU Ripple Fault” is logged
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Regenerative braking feeds 95 % of braking energy back to mains — saves 18 % power
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Temperature sensor derates current above 70 °C — no summer shutdowns
5. Replacement Cycle & Preventive Maintenance
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High-speed office (>1,000 starts day⁻¹) – blow dust every 3 months, replace OMU every 8 years
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Residential tower (300–600 starts day⁻¹) – inspect annually, replace every 12 years
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Low-rise freight (≤200 starts day⁻¹) – inspect every 18 months, replace every 15 years
Replace immediately if:
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DC bus >750 V or <450 V under load
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IGBT thermal sensor >85 °C with fan running
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Brake chopper faults ≥3 times in 30 days
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Capacitor bulge or ESR >150 % of spec
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“932 SBSB Fault” persistent (internal IGBT desaturation)
6. Extending Life – 3 Pro Tips
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Keep ambient <40 °C; every 10 °C rise halves capacitor life
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Torque DC lugs annually; loose connections cause arcing and ozone
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Run built-in capacitor test (P9.21) every 6 months; logs capacitance trend
7. Why Buy DBA26800H2 from Nanjing Zhuye Elevator Parts?
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Factory-new, not refurbished; passes 4 h burn-in at 60 °C full load
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Built-in 3 % line reactor — no extra purchase
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Dual stock: 90 pcs Nanjing, 30 pcs Dubai — next-day air to 65 countries
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Bundle kit: OMU + 2 Ω brake resistor + 3 m shielded motor cable — 8 % discount
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24 months warranty against IGBT failure or over-temperature
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7×24 WhatsApp/WeChat video support; average response 12 min
Conclusion
The Otis Elevator OMU DBA26800H2 is the invisible powerhouse that turns 400 V mains into silky elevator motion while giving 95 % of braking energy back to the grid. A single IGBT fault can park a car for hours. Keep a spare H2 from Nanjing Zhuye on every service truck, swap it on schedule, and replace “OMU Fault” panic with a thirty-minute planned fix — one smooth, energy-saving ride at a time.
