Description

1. Part-number breakdown GBA25005D1 = base HBB, 24 VDC, 48 button inputs, 8 audio channels, 2 × RS-485, IP20, –10 °C…+60 °C
   D2 = D1 + reinforced 4 kV isolation, built-in 0.5 A self-resetting fuse, hot-swap fan header, MTBF 90 kh @ 25 °C
   Both share 180 × 120 mm footprint, mass 0.32 kg
2. Safety first—lock-out & verify Board sits on 24 VDC logic but switches 110 V call contacts. Lock the main disconnect, hang a lock-out tag and wait 60 s for the rail to fall below 5 V. Keep the new NYE board in its anti-static bag until mounting—CMOS logic can latch at 15 V static.
3. Mechanical mounting—keep it cool Snap onto 35 mm DIN rail inside the COP or car-top box. Maintain 50 mm clearance above and below; every 10 °C rise halves relay life. If the box is <100 mm deep, mount vertically with RS-485 down—this allows convection chimney. NYE supplies a free DIN clip (NY-DIN-HBB) and 10 mm thermal pad (NY-PAD-HBB) for shallow enclosures.
4. Wiring map (print and stick inside box) 24 V & 0 V: 2.5 mm², 105 °C silicone, torque 0.8 N·m
   Button inputs: 48 × dry contact, 1 mm², torque 0.5 N·m
   Hand-set: mic 2 V pp, speaker 8 Ω 2 W, shielded twisted pair, <1 m
   Audio out: 4 × 0 dBV, 600 Ω, shielded pair, <30 m to landing speaker
   RS-485-A/B: twisted pair, 120 Ω termination at last board (DIP-1 ON)
   Earth: 4 mm² green/yellow to box PE; logic leakage <1 mA
5. Power-up & self-test Apply 24 VDC; green “SYS” LED blinks 3 s, then steady.
   Press each button; corresponding LED must illuminate within 100 ms and audio must play “Floor 1” (or site WAV). If LED is dim (<40 cd/m²) or audio THD >5 %, board is aged—replace immediately.
6. Audio & microphone calibration Otis HBB Cal Tool (free) via RS-485.
   Target: mic gain –20 dBV, speaker 0 dBV, frequency response 300–3 400 Hz, THD <3 %.
   Save parameters to EEPROM (button “Burn”); checksum must match label. Wrong checksum triggers “E-HBB” — re-calibrate immediately.
7. Temperature & lifetime model Relay contacts: 1 million cycles; at 600 calls/day = 4.5 years.
   MEMS microphone: 10 kh @ 25 °C, halves every 10 °C rise.
   Capacitor C1 (47 µF, 35 V): 2 000 h @ 105 °C, 64 kh @ 45 °C.
   Translate to building traffic: Light traffic (office, 600 calls/day) – relays ≈ 4.5 years, mic ≈ 10 years, full board ≈ 8 years; inspect every 3 years. Medium traffic (mall, 1 200 calls/day) – relays ≈ 2 years, mic ≈ 5 years, full board ≈ 4 years; inspect every 2 years. Heavy traffic (metro, 2 400 calls/day) – relays ≈ 1 year, mic ≈ 3 years, full board ≈ 2 years; inspect every 6 months.
8. Remote monitoring (optional) RS-485 registers:
   0x00 = button status (48-bit)
   0x01 = audio level (dBV)
   0x02 = temperature (°C)
   0x03 = cycle counter
   Poll every 30 s; cycle counter >1 million or temperature >70 °C schedules replacement.
9. Preventive inspection checklist Monthly: visual SYS LED, press all buttons, listen for voice clarity. Quarterly: measure 24 VDC ripple; >200 mV pp indicates supply fatigue. Annually: megger inputs to PE >100 MΩ; <10 MΩ indicates moisture ingress. Bi-annually: torque test 24 V screws; vibration loosens them, causing intermittent “E-HBB”.
10. Rapid swap (downtime < 3 min) a) Power down, lock-out, wait 60 s.
    b) Photograph wire numbers with phone.
    c) Remove DIN clip, slide old board out.
    d) Insert new NYE GBA25005D1/2, snap onto rail.
    e) Restore wires in exact order, set DIP switches as photo.
    f) Power up, run button & audio test.
    g) Log serial number and cycle counter; return old unit for recycling.
11. Recycling & sustainability Nanjing Zhuye offers prepaid DHL labels inside every carton.
    Returned boards are stripped: gold fingers go to certified refinery, plastic housing re-granulated, relay silver recovered.
    One recycled HBB saves 1.4 kg CO₂—enough to power the same COP for a week.