Description

Otis elevator DISS door panel JAA26805 Brief introduction

1. What the JAA26805 does

• 600 V, 30 A dual IGBT H-bridge drives the 230 Vac PM door motor
• STM32F ARM processor runs Otis DISS 3.2 firmware with SIL 2 safety loop
• Differential encoder input (RS-422) monitors rotor position to 0.09°
• On-board 24 Vdc buck converter powers car-top accessories up to 3 A
• UL/CE recognised to EN 81-20 and CSA B44.1 for 5 million cycles

2. Tools to carry

• JAA26805 board (Nanjing Zhuye part #OT-DB-JAA26805) in anti-static foam
• 2 mm & 3 mm flat screwdrivers, TX10 Torx
• Oscilloscope or multi-meter with Hz function
• Otis Service Tool (OST) laptop with DISS 3.x licence
• RJ-45 patch cable (2 m, shielded)
• Lock-out / tag-out kit

3. Installation – 20 minutes if you copy the parameters first
   Safety: place the car on inspection, open the main disconnect and wait 5 min for DC bus to discharge (<5 V).

1. Photograph every wire – note orange (L1), yellow (L2) for motor, red (+24 V), black (0 V), green (CAN-H), white (CAN-L).
2. Remove four TX10 screws; slide the old board out of the plastic stand-offs.
3. Check the heat-sink pad – if torn, replace with new 0.5 mm thermal sheet supplied in the kit.
4. Mount the new JAA26805; torque screws to 1.2 N·m.
5. Re-connect all plugs; tug-test each one.
6. Power up – STATUS LED should blink green 3 times then stay solid.
7. Launch OST → Door → Parameter Upload; select the XML file you exported from the old board (always do this before removal).
8. Run a 3-cycle learn routine: the board auto-detects cam positions and stores them in EEPROM.
9. Measure peak motor current – target 2.8 A ±0.2 A during open stroke.

4. Functional test – prove it to the controller
   a) Full-speed open time: 2.3 s ±0.1 s at 50 Hz mains.
   b) Close nudge torque: 150 N ±10 N measured at the leading edge.
   c) Reversal on 30 mm obstruction must occur within 100 ms.
   d) Encoder count: 2048 pulses per revolution, no missing ticks.
   e) Log all values in OST and export PDF for the site file.
5. Preventive maintenance schedule

• Monthly – visual sweep for burnt smell or swollen DC-bus capacitors.
• Quarterly – check heat-sink temperature <55 °C with IR gun.
• Annually – scope the PWM outputs; shoot-through spikes must be <50 V.
• Every two years – replace the 470 µF, 450 V capacitor – ESR doubles every 5 years.

6. Replacement cycle – data beats guesswork
   Otis specification: 5 million cycles ≈ 10 years at 400 starts/day. Nanjing Zhuye analytics refine this:

• Light duty (<150 starts/day, office): 12 years
• Standard duty (150–400 starts, residential): 10 years
• Heavy duty (>400 starts, hospital, mall): 7 years
• High ambient (>40 °C, rooftop MRL): 5 years – capacitor life halves every 10 °C rise.

• STATUS LED shows red double-blink – IGBT desaturation fault
• DC bus droops below 300 V under load – capacitor ESR too high
• Burn mark around R33 – gate-drive resistor cracked by vibration
• Door current >3.5 A – shorted winding or failing IGBT

7. Eco-disposal & warranty
   Return the old board in the prepaid anti-static box; Nanjing Zhuye recovers gold, copper and aluminium and issues a €10 recycling credit. Every JAA26805 ships with a 24-month replacement warranty, extendable to 60 months when you join our annual capacitor-replacement program.
8. Why buy from Nanjing Zhuye Elevator Parts

• 1,800 units in stock, Rotterdam & Nanjing, flashed with latest firmware
• Factory-sealed Otis packaging with hologram – no grey-market clones
• QR code on box links to parameter template and 5-minute install video
• 24/7 technical hotline staffed by ex-Otis door specialists
• Bundle pricing: buy 5 boards and get a free heat-sink pad kit plus freight credit

9. Bottom line
   A failed door board is the fastest way to a trapped-passenger call. Keep a genuine, pre-programmed JAA26805 on every truck, swap it in 20 minutes, and your doors will open and close like new for the full ten-year design cycle. Order today from Nanjing Zhuye Elevator Parts—the fastest route from “fault code” to “fault-free.”

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