Description

GAA24350BP1 Otis Elevator AT120R Door Operation Box Brief Introduction

1. What GAA24350BP1 Really Is

• Function: 24 VDC door driver + encoder interface + brake chopper + CAN gateway
• Power: 24 VDC ±10 %, 90 A peak, 25 A continuous
• Motor: 3-phase PM synchronous, 2.2 kW, 1,024 ppr encoder, 8-pole
• Torque: 8 Nm rated, 20 Nm peak (300 %) for 5 s
• Speed: 0–180 rpm, ±1 rpm accuracy, <52 dB(A) at 1 m
• Regeneration: 4-quadrant IGBT feeds 25 % of braking energy back to 24 V bus
• Housing: IP55 aluminium, 120 × 140 × 110 mm, -25 °C to +70 °C
• Firmware: pre-loaded V9.06; checksum matches Otis original 0x9C7E

2. Where It Is Used

• Otis Gen2-R2®, Gen2-Life®, SkyRise® 1.75–4.0 m s⁻¹
• Thyssen TCM-MC3 retrofit kits
• Chinese super-MRL controllers with 24 VDC door bus
• Suitable for centre-opening or side-opening doors 900–1,400 mm clear width

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

1. Remove old controller — undo 4 M8 hanger bolts; unplug 8-way Molex.
2. Mount BP1 — slide into 120 mm header until latches click; earth strap to PE.
3. Connect plugs:
   • J1: 24 VDC (red/black)
   • J2: motor U/V/W (shielded)
   • J3: encoder A/B/Z + 5 V
   • J4: CAN H/L + shield
   • J5: brake resistor B+/B- (2 Ω, 300 W)
4. Apply 24 V — green LED blinks 1 Hz while loading parameters, then steady.
5. Auto-tune: press and hold TUNE for 3 s; controller runs one open/close cycle, stores stator resistance and encoder offset.
6. Run 5 cycles — verify current <25 A, torque ripple <3 %, stop accuracy ±1 mm.

4. Daily Operation – What the Controller Actually Does

• Updates torque every 40 µs; stop jerk <0.3 m/s³ — passengers feel nothing
• Auto-compensates for door mass; learns rubber ageing every 24 h
• Built-in 24 h self-test — if encoder drift >0.3 mm, “Door Learn Fault” is logged
• Regenerative braking feeds 25 % of door energy back to 24 V bus — saves battery life
• Temperature sensor derates current above 70 °C — no summer shutdowns

5. Replacement Cycle & Preventive Maintenance

• High-traffic metro (>1,500 cycles day⁻¹) – blow dust every 3 months, replace controller every 6 years
• Shopping mall (600–1,000 cycles day⁻¹) – inspect annually, replace every 10 years
• Low-rise office (≤400 cycles day⁻¹) – inspect every 18 months, replace every 12 years

• Encoder count error >3 pulses per revolution
• Brake resistor temperature >120 °C with normal duty
• Vibration >55 dB(A) at 1 m during run
• Bearing temperature >65 °C after 10 min run
• EEPROM error 0xE2 after power dip (parameter corrupt)

6. Extending Life – 3 Pro Tips

1. Keep 24 VDC ±5 %; spikes above 30 V destroy the on-board buck converter
2. Torque motor lugs annually; loose connections cause arcing and ozone
3. Clean encoder disk monthly; brake dust creates false counts

7. Why Buy GBA24350BP1 from Nanjing Zhuye Elevator Parts?

• Factory-new, not refurbished; passes 4-hour burn-in at 60 °C and 2,000-cycle door test
• Firmware pre-flashed; matches Otis original checksum, no teach-in required
• Anti-static foam box + silica gel — safe for air freight
• Dual stock: 380 pcs Nanjing, 120 pcs Dubai — next-day delivery to 65 countries
• Bundle kit: controller + 2 Ω brake resistor + 3 m encoder cable — 8 % discount
• 24 months warranty against bearing wear or encoder drift
• 7×24 WhatsApp/WeChat video support; average response 10 minutes

Conclusion