Description

1. Decoding the suffix HAA29505AT1 = 24 VDC PNP, 4 mm sensing distance, 2 kHz switching frequency, M12 barrel, 2 m PUR cable
   AT2 = 24 VDC NPN, 4 mm, M12, shielded for high EMI sites
   AT3 = 110 VAC 2-wire, 5 mm, M18, for legacy controllers
   AT4 = 24 VDC analogue 0–10 V, 8 mm, M18, for high-precision leveling (±1 mm)
   All versions share the same –25 °C to +70 °C range, IP67 front, LED status indicator and short-circuit protection.
2. Safety first—lock-out & verify Although sensors are low-voltage, the car-top can still hold 110 VDC on the brake. Lock the main disconnect, engage the car-top inspection switch and wait 60 s for the 24 V rail to fall below 5 V. Keep the new Nanjing Zhuye sensor in its anti-static bag until mounting—CMOS output stages can latch at 15 V static.
3. Mechanical mounting—keep the gap The sensor threads into an M12 (AT1/2) or M18 (AT3/4) steel bracket welded to the car cross-head. Use the supplied nyloc nut; torque 15 N·m (M12) or 25 N·m (M18). Aim the face perpendicular to the steel vane on the rail; angular deviation > ±3° reduces sensing distance 10 %. Maintain 2 mm clearance (AT1/2) or 3 mm (AT3/4) to the vane; every 0.5 mm of dust build-up equals 0.3 mm level error.
4. Wiring map (print and stick inside controller) AT1/2: Brown = +24 V, Blue = 0 V, Black = PNP/NPN output, Shield = PE at controller end only
   AT3: Brown = 110 V L, Blue = 110 V N, load current 8 mA, no neutral connection to sensor
   AT4: Brown = +24 V, Blue = 0 V, White = 0–10 V out, 100 Ω min load, Shield = PE
   All cables: PUR sheath, 2 m standard; Nanjing Zhuye offers 5 m and 10 m variants (NY-CAB-ATxx).
5. Power-up & functional test Apply rated voltage; LED should be off (no target). Insert a 4 mm (AT1/2) or 8 mm (AT4) steel feeler gauge; LED turns on and output switches. Measure switching point with dial gauge: repeatability must be < 0.1 mm. If hysteresis > 0.3 mm, vane edge is rounded—file flat or replace vane.
6. Calibration (AT4 analogue only) Place car at exact floor level (verified with machinist rule). Multimeter on white wire: adjust VR1 until output = 5.00 V ±0.02 V. Move car ±10 mm; voltage should change ±2.00 V ±0.05 V. Record gradient in controller parameter LVL-GAIN; > 5 % error triggers “E-LEVEL” fault.
7. Temperature & lifetime model LED emitter: 50 kh @ 25 °C, doubles every 10 °C drop. Capacitor inside AT4: 2 000 h @ 105 °C, 64 kh @ 45 °C. Cable flex: 1 million cycles; at 300 trips/day = 3 years. Translate to building traffic: Light traffic (residence, 60 trips/day) – LED ≈ 30 years, cable ≈ 15 years, full sensor ≈ 12 years; inspect every 3 years. Medium traffic (office, 300 trips/day) – LED ≈ 10 years, cable ≈ 5 years, full sensor ≈ 6 years; inspect every 2 years. Heavy traffic (mall/metro, 1 000 trips/day) – LED ≈ 5 years, cable ≈ 3 years, full sensor ≈ 4 years; inspect every 6 months.
8. Preventive inspection checklist Monthly: visual LED, wipe sensor face with lint-free cloth. Quarterly: feeler-gauge test switching point; > 0.2 mm drift schedules replacement. Annually: megger cable > 100 MΩ; < 10 MΩ indicates oil ingress. Bi-annually: torque check M12/M18 nut; vibration loosens it, causing level drift.
9. Rapid swap (downtime < 5 min) a) Place car at mid-floor, lock-out, tag out. b) Photograph cable colours with phone. c) Unscrew sensor, slide old unit out. d) Thread new Nanjing Zhuye HAA29505AT, torque 15 N·m (M12) or 25 N·m (M18). e) Restore cable, power up, run switching test. f) Calibrate AT4 if fitted. g) Log serial number and gap value; return old unit for recycling.
10. Recycling & sustainability Nanjing Zhuye offers prepaid UPS labels inside every carton. Returned sensors are stripped: stainless barrel re-melted, copper cable recycled, electronics processed for gold and gallium. One recycled sensor saves 0.6 kg CO₂—enough to power the same car-top for a week.