Description

1. Part-number breakdown NY20041119 = Otis global spare, replaces all regional variants 20041119-A to -E
   Sound level: 95 dB(A) ±3 dB @ 1 m, 1 kHz square-wave, class-D 2 W amplifier
   Voltage: 24 VDC ±10 %, 60 mA quiescent, 120 mA peak
   Frequency: jumper-selectable 800 Hz / 1 kHz / 2 kHz (factory 1 kHz)
   MTBF: 80 kh @ 25 °C; relay output 1 A 30 V for external beacon
2. Safety first—lock-out & verify Buzzer power is taken from the 24 VDC logic rail. Lock the controller breaker, hang a lock-out tag and wait 60 s for the rail to fall below 5 V. Keep the new Nanjing Zhuye buzzer board in its anti-static bag until mounting—CMOS oscillator can latch at 15 V static.
3. Mechanical mounting—keep the sound path clear PCB size: 55 × 40 × 20 mm, mass 28 g. Snap onto 35 mm DIN rail or use two M3 screws (torque 0.4 N·m) inside the COP or car-top box. Maintain 20 mm clearance in front of the piezo; every 5 mm obstruction drops SPL 1 dB. If the enclosure is < 50 mm deep, mount vertically with sound port downward—this prevents dust accumulation. NYE supplies a free DIN clip (NY-CLIP-BUZZ) and a 30 mm ABS spacer (NY-SPC-BUZZ) when ordered.
4. Wiring map (print and stick inside door) +24 V (brown), 0 V (blue), shield to PE at controller end only
   Sound trigger: TTL 5 V or 24 V dry contact (J1-3)
   Relay out: N/O 30 V 1 A (J1-4) for remote beacon or flashing light
   Torque: 0.5 N·m for 0.5 mm², 0.8 N·m for 1.5 mm²
5. Frequency & volume selection Jumper JP1: 800 Hz (low tone), 1 kHz (medium), 2 kHz (high)
   Jumper JP2: high (95 dB) or low (85 dB) for quiet buildings
   Factory default is 1 kHz / high; change jumpers before power-up. Measure SPL with dB-meter 1 m axial: target 95 dB ±3 dB. < 90 dB indicates piezo fatigue or obstructed port—replace board.
6. Functional test at power-up Apply 24 VDC; green “PWR” LED steady.
   Short trigger to +24 V for 2 s; output must be 1 kHz tone + relay closed.
   Release trigger; tone and relay must drop within 50 ms.
   If tone continues > 100 ms, output transistor is shorted—replace board.
7. Temperature & lifetime model Piezo disc: 1 million cycles; at 300 door cycles/day = 3 years.
   Electrolytic capacitor C1 (47 µF, 35 V): 2 000 h @ 105 °C, 32 kh @ 55 °C.
   Translate to building traffic: Light traffic (residence, 60 cycles/day) – piezo ≈ 15 years, cap ≈ 20 years, full board ≈ 12 years; inspect every 3 years. Medium traffic (office, 300 cycles/day) – piezo ≈ 3 years, cap ≈ 6 years, full board ≈ 5 years; inspect every 2 years. Heavy traffic (mall/metro, 600 cycles/day) – piezo ≈ 1.5 years, cap ≈ 3 years, full board ≈ 2.5 years; inspect every 6 months.
8. Preventive inspection checklist Monthly: press door-close button, verify 95 dB tone and relay click. Quarterly: measure 24 VDC ripple; >200 mVpp indicates supply fatigue. Annually: SPL meter test; <90 dB schedules replacement. Bi-annually: torque test J1 screws; vibration loosens them, causing intermittent silence.
9. Rapid swap (downtime < 2 min) a) Place car at landing, lock-out, tag out. b) Photograph wire colours with phone. c) Remove DIN clip or M3 screws, slide old board out. d) Insert new Nanjing Zhuye NY20041119, torque 0.4 N·m. e) Restore cables, power up, run tone test. f) Log serial number and SPL reading; return old unit for recycling.
10. Recycling & sustainability Nanjing Zhuye offers prepaid UPS labels inside every carton.
    Returned buzzer boards are stripped: brass piezo disc remelted, copper coil recycled, PCB processed for gold and palladium.
    One recycled buzzer saves 0.3 kg CO₂—enough to power the same COP for a week.