Description

1. What the suffix means GAA25005F1 = second-generation SHL board, 24 VDC, 3-digit 7-segment plus direction arrow, CAN-bus 125 kbit/s, IP41 front, IP20 rear.
   Colour: amber (peak 590 nm) for standard smoked lens; white or blue available by special order.
   Current: 20 mA per segment, 120 mA peak during arrow animation.
   Lifetime: 50 000 h to L70 (70 % of initial luminance) at 25 °C ambient.
2. Static control & power-down Although the board is low-voltage, the LOP still sits on the same 24 V rail that feeds the brake. Lock-out the controller breaker, hang a tag and wait 60 s for the rail to fall below 5 V. Keep the new Nanjing Zhuye unit in its metallised bag until you are ready to mount—CMOS drivers can latch at 30 V static.
3. Mechanical mounting—lens first The PCB snaps onto four 6 mm brass stand-offs inside the SHL bezel. Remove the bezel (two M4 screws at the bottom), slide the old board out and disconnect J1-J3. Fit the new GAA25005F1, making sure the 14-segment LED block is flush with the acrylic; a 0.5 mm gap creates parallax dark spots. Torque M3 screws 0.4 N·m—over-tightening warps the PCB and cracks SMD pads. Re-use the original gasket; if it is compressed > 1 mm replace it (NY-GASK-SHL) to maintain IP41.
4. Connector map (print and tape inside bezel) J1 – 24 VDC & CAN-H/L (3-way, polarised)
   J2 – Arrow LED common anode (2-way)
   J3 – Remote gong relay, 30 V 1 A (3-way, optional)
   SW1 – Hex address 01–FE (00 and FF reserved)
   VR1 – Brightness pot, 15 % adjustment range
5. Addressing & CAN handshake Otis controllers poll SHL nodes at 125 kbit/s. Set SW1 to the floor number in hex: floor 1 = 01, floor 10 = 0A, floor 25 = 19. Duplicate addresses trigger “E-SHL” on the COP LCD and lock the car. Green “COMM” LED should blink 2 Hz during scan, then stay solid; flashing 8 Hz means bus-off—check 120 Ω termination (supplied on every Nanjing Zhuye board—close DIP-1 only on the last LOP).
6. Brightness & colour tuning Out-of-box current is 18 mA per segment, optimised for 6 mm smoked lens. For white or blue acrylic, turn VR1 counter-clockwise 1/8 to avoid wash-out. Measure luminance with a lux-meter 2 m straight-on: target 35 cd/m² for office lobby, 55 cd/m² for outdoor podium. Beyond VR1 limit the on-board LM2596 will overheat; order a different LED colour instead.
7. Temperature & lifetime model LED phosphor decay follows Arrhenius: every 10 °C drop doubles life. At 35 °C inside the bezel (typical for 12 h/day mall) the board reaches 45 °C; L70 life is then 50 000 h × 2^((50-25)/10) ≈ 100 000 h. Translate to traffic: Light traffic (residence, 30 calls/day) – 182 h/year → replace ≈ 27 years; inspect every 5 years. Medium traffic (hotel, 200 calls/day) – 1 200 h/year → inspect every 2 years, replace ≈ 4 years. Heavy traffic (metro, 1 000 calls/day) – 6 000 h/year → inspect every 6 months, replace ≈ 18 months. Capacitor life: 105 °C, 2 000 h rated; at 45 °C Arrhenius predicts 64 000 h—same as LED L70, so both wear out together.
8. Preventive inspection checklist Monthly: visual check for missing segments, ghost arrows. Quarterly: measure 24 VDC ripple at J1; > 200 mVpp indicates supply fatigue, not board fault. Annually: photograph display from the same spot; compare RGB values—>20 % drop in red channel predicts imminent L70 failure. Bi-annually: IR thermometer scan—any hot spot > 25 °C above ambient indicates failing LM2596 or relay coil.
9. Wear limits & immediate-change triggers • Visible segment dark > 30 % of stroke. • Arrow flicker during fire-service recall (E-SHL logged). • Gong sound pressure < 65 dB(A) at 1 m (optional capsule speaker worn). • CAN error frame > 5 % of traffic (contact resistance > 1 Ω). • Capacitor C1 (47 µF, 35 V) ESR > 2 Ω.
10. Rapid swap (downtime < 3 min) a) Power down, tag out, wait 60 s. b) Photograph J1-J3 orientation with phone. c) Remove two bezel screws, slide old board out. d) Insert new Nanjing Zhuye GAA25005F1, torque 0.4 N·m. e) Restore connectors J1→J2→J3. f) Power up, verify green COMM LED solid. g) Cycle car to floor, check direction arrow invert. h) Log serial number and install date; return old unit for recycling.
11. Recycling & sustainability Nanjing Zhuye offers prepaid UPS labels inside every carton. Returned boards are stripped: gold fingers go to certified refinery, aluminium heat-sink remelted, LEDs recovered for indium. One recycled arrival light saves 1.2 kg CO₂—enough to power the same LOP for a month.