Description
Otis elevator electronic board GCA26800MD3 Brief Introduction
|
Product Name
|
Otis elevator electronic board |
|
Model
|
GCA26800MD3
|
|
Quality
|
Original.Brand New
|
|
Payment
|
T/T. Paypal. Western Union
|
|
Delivery
|
3-5 Working Days
|
|
Packaging
|
Packed by carton
|
Elevator Electronic Board GCA26800MD3 – The Brains Behind Every Silent Ride
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
When passengers press a button, watch the floor count change, or hear the doors announce “going up,” they are really talking to a green postcard-sized PCB hidden in the controller cabinet. The GCA26800MD3 is Otis’ latest-generation multi-function board, field-proven on Gen2® Life, Gen2® Premier and SkyRise® installations worldwide. Nanjing Zhuye Elevator Parts keeps factory-sealed MD3 units in anti-static stock for same-day despatch. Below we explain what the board does, how to install it in under ten minutes, and the replacement cycle that prevents expensive “control fault” call-backs.
-
What GCA26800MD3 Really Does Mounted on DIN-rail inside the LMCB or GECB cabinet, the board:
-
Converts serial CAN-bus commands into 24 VDC relay outputs for contactors, brakes and door motor
-
Reads position pulses from incremental encoder (8192 ppr) and provides closed-loop speed profile
-
Supplies 5 VDC / 12 VDC rails for COP, LOP and safety chain
-
Monitors brake voltage, motor temperature and door lock feedback
-
Stores floor parameters, learn tables and fault log in 1 Mb EEPROM—so the car “remembers” after a power dip
If MD3 fails, the lift goes dead, the doors refuse to move, and the controller logs “EF6 Control Timeout”.
-
Compatible Systems
-
Otis Gen2® Life, Gen2® Premier, SkyRise®
-
Thyssen MC2 → MC3 retrofit kits
-
Chinese OEM controllers using CAN-open at 125 kbit s⁻¹
-
Simplex or group (≤8 cars)
-
Installation – 10-Minute Hot Swap Safety: place controller on INSTALL, lock breaker, wait 60 s for DC bus to discharge.
Step 1 – Photograph existing wiring. Step 2 – Undo four M3 screws; slide board out of DIN rail. Step 3 – Disconnect (in order) 64-way ribbon, 6-way CAN, 4-way 24 VDC supply, 2-way encoder. Step 4 – Inspect ribbon for bent pins; if any conductor shows copper, replace cable (Nanjing Zhuye part CB-64-300). Step 5 – Insert new MD3 until latches click; reconnect all keyed plugs. Step 6 – Power up; green D1 LED blinks 2 Hz for 5 s, then steady—board has joined CAN network. Step 7 – Run one full learn trip from top to bottom; verify encoder counts every floor. No laptop or download is required; firmware is pre-flashed to match Otis checksum 0x7A3C.
-
Daily Operation – What the Board Actually Does
-
Updates speed curve every 2 ms; jitter <0.1 % rated speed
-
Auto-detects if encoder channel is reversed; sends “Enc-Fault” but keeps running
-
Temperature sensor on PCB derates output current above 70 °C—no summer nuisance faults
-
Brake pick & hold voltages adjustable via jumper J6—one board fits 110 VDC or 220 VDC coils
-
Replacement Cycle & Preventive Maintenance
-
High-traffic office (>1,000 starts day⁻¹) – vacuum dust every 6 months, replace board every 6 years
-
Residential tower (300–600 starts day⁻¹) – inspect annually, replace every 10 years
-
Low-rise freight (≤200 starts day⁻¹) – inspect every 18 months, replace every 12 years
Replace immediately if:
-
D1 LED stays red (internal 3.3 V rail fault)
-
CAN “EF6” logged ≥3 times in 30 days
-
Encoder count skips >4 pulses per revolution
-
EEPROM error 0xE2 after power dip (checksum corrupt)
-
Brake voltage drops below 85 % of rated
-
Extending Life – 3 Pro Tips
-
Keep 24 VDC supply ±3 %; spikes above 30 V destroy the on-board buck converter
-
Close controller door properly; dust on edge connectors is the #1 killer
-
Route encoder cable away from brake resistor; radiated heat above 70 °C halves IC life
-
Why Buy GCA26800MD3 from Nanjing Zhuye Elevator Parts?
-
Factory-new, not refurbished; board passes ICT, 4-hour burn-in at 60 °C, and final functional test
-
Firmware pre-flashed; matches Otis original checksum, no teach-in required
-
Anti-static aluminum bag + foam box—safe for air freight
-
Dual stock: 380 pcs Nanjing, 120 pcs Dubai—next-day delivery to 65 countries
-
Warranty: 24 months replacement, no factory RMA wait
-
Tech support: 7×24 WhatsApp/WeChat video call if fault codes persist
We reply within 12 h with price, lead time and a free Excel template that reminds you when the next board replacement is due.
Conclusion The GCA26800MD3 electronic board is the invisible brain that turns button presses into smooth rides. A single communication fault can park a car for hours. Keep a spare MD3 from Nanjing Zhuye on every service truck, swap it on schedule, and replace “control fault” panic with a five-minute planned fix—one silent, reliable ride at a time.
