Otis Elevator OMU DBA26800H2

Description

Otis Elevator OMU
DBA26800H2 Brief Introduction

1. What DBA26800H2 Really Is

• Power Section: 3 × 380–480 VAC, 150 A continuous, 200 % for 60 s
• Output: 3 × 0–400 VAC, 0–100 Hz, 75 kW (100 kW peak)
• Control: 32-bit DSP, vector torque loop 50 µs, speed loop 500 µs
• Technology: 4-quadrant IGBT with integrated brake chopper, 95 % regeneration
• Interfaces: CAN-open 1 Mbit/s + 0–10 V speed reference, incremental encoder 8,192 ppr
• Protection: IP20 PCB, over-current, over-temp, under-voltage, short-circuit
• Size: 300 × 200 × 55 mm — DIN-rail or chassis mount
• Firmware: pre-loaded V12.06; checksum matches Otis original 0x9C7E

2. Where It Is Used

• Otis SkyRise®, Gen2-R2® 2.5–6.0 m s⁻¹ with PM machines 45–75 kW
• Thyssen TCM-MC3 retrofit kits
• Chinese super-MRL controllers with 400 V class motors
• Suitable for 1–64 floors, simplex or group (≤8 cars)

3. Commissioning – 30-Minute Plug-and-Play

1. Remove old H2 — undo 6 DIN-rail clips; unplug 100-way ribbon, 8-way CAN, 6-way motor.
2. Inspect bus bars — if burnt >1 mm, replace copper (Nanjing Zhuye part CB-BUS-150A).
3. Insert H2 — snap until latches click; reconnect all keyed plugs.
4. Connect brake resistor to B+/B-; set jumper J3 to “400 V 2 Ω”.
5. Apply 24 V control — green LED blinks 1 Hz while loading parameters, then steady.
6. Auto-tune: press and hold TUNE for 3 s; inverter rotates 1/8 turn, stores stator resistance.
7. Run full-speed inspection — verify current <110 % rated, regeneration 95 %.

4. Daily Operation – What the OMU Actually Does

• Updates torque every 50 µs; speed ripple <0.02 % — passengers feel nothing
• Auto-compensates for rope stretch; stores creep data every trip
• Built-in 24 h self-test — if DC bus ripple >5 V, “OMU Ripple Fault” is logged
• Regenerative braking feeds 95 % of braking energy back to mains — saves 18 % power
• Temperature sensor derates current above 70 °C — no summer shutdowns

5. Replacement Cycle & Preventive Maintenance

• High-speed office (>1,000 starts day⁻¹) – blow dust every 3 months, replace OMU every 8 years
• Residential tower (300–600 starts day⁻¹) – inspect annually, replace every 12 years
• Low-rise freight (≤200 starts day⁻¹) – inspect every 18 months, replace every 15 years

• DC bus >750 V or <450 V under load
• IGBT thermal sensor >85 °C with fan running
• Brake chopper faults ≥3 times in 30 days
• Capacitor bulge or ESR >150 % of spec
• “932 SBSB Fault” persistent (internal IGBT desaturation)

6. Extending Life – 3 Pro Tips

1. Keep ambient <40 °C; every 10 °C rise halves capacitor life
2. Torque DC lugs annually; loose connections cause arcing and ozone
3. Run built-in capacitor test (P9.21) every 6 months; logs capacitance trend

7. Why Buy DBA26800H2 from Nanjing Zhuye Elevator Parts?

• Factory-new, not refurbished; passes 4 h burn-in at 60 °C full load
• Built-in 3 % line reactor — no extra purchase
• Dual stock: 90 pcs Nanjing, 30 pcs Dubai — next-day air to 65 countries
• Bundle kit: OMU + 2 Ω brake resistor + 3 m shielded motor cable — 8 % discount
• 24 months warranty against IGBT failure or over-temperature
• 7×24 WhatsApp/WeChat video support; average response 12 min

Conclusion