Description

1. Part-number breakdown XAA177HD1 = complete assembly: zinc die-cast body, stainless roller Ø 19 mm, IP54, –25 °C…+70 °C, 24 VDC 5 A, 250 VAC 5 A, 2 m PUR cable
   Replaces legacy XAA177HD and XAA177HC without modification
2. Safety first—lock-out & verify The switch sits on the 24 VDC logic rail but 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 rail to fall below 5 V. Keep the new Nanjing Zhuye smoke-pole in its sealed bag until mounting—grease attracts dust.
3. Mechanical mounting—keep the roller square Body: 90 × 45 × 30 mm, mass 0.28 kg.
   Mount on 30 × 30 mm angle bracket welded to the car cross-head using two M6 × 20 mm bolts (torque 10 N·m).
   Roller must be perpendicular to the rail cam; angular error > ±3° reduces repeatability by 0.5 mm.
   Maintain 1.5 mm nominal gap between roller and cam when car is level; every 0.2 mm of wear equals 0.1 mm level error.
4. Wiring map (print and stick inside controller) Brown = +24 V supply (LED anode)
   Blue = 0 V (LED cathode)
   Black = N/O contact “LEVEL”
   White = N/C contact “NOT-LEVEL”
   Shield = PE at controller end only
   Wire size: 0.5 mm² PUR, 2 m standard; NYE offers 5 m and 10 m variants (NY-CAB-SMOKE)
5. Pre-leveling check Run car to floor at inspection speed.
   Insert 1.5 mm feeler gauge between roller and cam; both LEDs (on switch and COP) must change state within 0.05 mm.
   If hysteresis > 0.2 mm, cam edge is rounded—file flat or replace cam.
6. Contact functional test With DMM on logic input, press roller by hand; contact resistance must be <50 mΩ.
   Release roller; leakage <1 µA.
   If contact bounces >1 ms or resistance >100 mΩ, silver layer is worn—replace immediately.
7. Operating-force curve Factory spring: 3 N preload, 6 N full travel (2 mm).
   If force <2 N, spring is fatigued; >8 N indicates seized pivot—both schedule replacement.
8. Temperature & lifetime model Roller bearing: 50 kh @ 25 °C, doubles every 10 °C drop.
   Contact silver: 100 k electrical cycles @ 5 A.
   Spring stainless: 1 million cycles.
   Translate to building traffic: Light traffic (residence, 60 trips/day) – roller ≈ 25 years, contacts ≈ 20 years, full switch ≈ 18 years; inspect every 3 years. Medium traffic (office, 300 trips/day) – roller ≈ 8 years, contacts ≈ 5 years, full switch ≈ 5 years; inspect every 2 years. Heavy traffic (mall/metro, 800 trips/day) – roller ≈ 4 years, contacts ≈ 2.5 years, full switch ≈ 2 years; inspect every 6 months.
9. Preventive inspection checklist Monthly: visual roller, wipe cam with lint-free cloth. Quarterly: feeler-gauge test switching point; >0.1 mm drift schedules replacement. Annually: megger cable >100 MΩ; <10 MΩ indicates oil ingress. Bi-annually: torque check M6 bolts; vibration loosens them, causing level drift.
10. Rapid swap (downtime < 5 min) a) Place car at mid-floor, lock-out, tag out. b) Photograph wire colours with phone. c) Remove M6 bolts, slide old switch out. d) Insert new Nanjing Zhuye XAA177HD1, torque 10 N·m. e) Restore cable, power up, run roller test. f) Log serial number and gap value; return old unit for recycling.
11. Recycling & sustainability Nanjing Zhuye offers prepaid UPS labels inside every carton.
    Returned smoke-poles are stripped: stainless roller remelted, copper cable recycled, zinc body re-smelted.
    One recycled switch saves 0.7 kg CO₂—enough to power the same car-top for a week.