Description

Otis Escalator Communication Board  RSFFDAA26803NNP1

1. What RSFFDAA26803NNP1 Really Is

• Core: 32-bit ARM Cortex-M4, 120 MHz, 0.5 ms safety loop refresh
• Memory: 2 Mb FRAM + 8 Mb SDRAM — 20-year data retention without battery
• Interfaces: CAN-open 1 Mbit/s (escalator chain), RS-485 115 kbit/s (handrail), 0–10 V speed reference
• I/O: 64 digital inputs (skirt switches, step missing, handrail speed), 32 relay outputs (brake, motor, horn)
• Power: 24 VDC ±10 %, 3 A peak, 1.2 A typical
• Size: 200 × 130 × 35 mm — DIN-rail or chassis mount
• Firmware: pre-loaded V10.06; checksum matches Otis original 0x9C7E

2. Where It Is Used

• Otis NCE-600, NCE-800, NCT-1000 escalators 0.5–1.0 m s⁻¹
• Thyssen TEC-6 retrofit kits with Otis protocol
• Chinese NCE-style controllers up to 1,000 mm step width
• Suitable for indoor shopping malls, outdoor metro stations, coastal airports

3. Installation – 15-Minute Hot Swap

1. Photograph wiring — note DIP-switch S1-5 position.
2. Remove old NNP1 — undo 4 DIN-rail clips; unplug 64-way ribbon, 6-way CAN, 4-way encoder.
3. Inspect ribbon — if bent pins >3, replace cable (Nanjing Zhuye part CB-64-300).
4. Insert NNP1 — snap until latches click; reconnect all keyed plugs.
5. Set DIP-SW1:
   • S1-5 ON = 0.5 m/s, OFF = 1.0 m/s
   • S1-8 ON = outdoor mode (salt spray protection)
6. Power on — green D1 blinks 2 Hz for 8 s while FRAM checksum is verified, then steady.
7. Run one full cycle — verify step missing sensor, skirt pressure and handrail speed all active.

4. Daily Operation – What the Board Actually Does

• Updates motor torque every 0.5 ms; jerk <0.3 m/s³ — passengers feel nothing
• Auto-compensates for step wear; stores chain elongation every 24 h
• Built-in 24 h self-test — if skirt pressure >120 N, “Skirt Fault” is logged
• Regenerative braking feeds 15 % of motor 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 (>1,400 running hours year⁻¹) – blow dust every 3 months, replace board every 6 years
• Shopping mall (600–1,000 h/y) – inspect annually, replace every 10 years
• Low-rise office (≤400 h/y) – inspect every 18 months, replace every 12 years

• D1 LED stays red for >5 s (internal 3.3 V rail fault)
• CAN “Esc PCB Fault” logged ≥3 times in 30 days
• Encoder count skips >8 pulses per revolution
• FRAM checksum error 0xF0 after power dip (data corrupt)
• Safety chain opens sporadically with no external cause

6. Extending Life – 3 Pro Tips

1. Keep 24 VDC ±5 %; spikes above 30 V destroy the on-board buck converter
2. Close controller door; dust on edge connectors is the #1 killer
3. Route encoder cable away from brake resistor; radiated heat above 70 °C halves MCU life

7. Why Buy RSFFDAA26803NNP1 from Nanjing Zhuye Elevator Parts?

• Factory-new, not refurbished; passes ICT, 4-hour burn-in at 60 °C, and final functional test
• Firmware V10.06 pre-flashed; matches Otis original checksum, no teach-in required
• Anti-static aluminum bag + foam box — safe for air freight
• Dual stock: 420 pcs Nanjing, 150 pcs Dubai — next-day delivery to 65 countries
• Bundle kit: board + 64-way ribbon + DIP-switch tool — 8 % discount
• 24 months warranty against drift or communication failure
• 7×24 WhatsApp/WeChat video support; average response 10 minutes

Conclusion