Description

1. Why MEAN WELL RS-50 fits elevators
   • 88 % efficiency at 230 VAC, 85 % at 115 VAC—PFC front-end avoids utility penalties.
   • –25 °C to +70 °C operation without fan; at 55 °C ambient still delivers 40 W, perfect for locked metal cabinet in summer.
   • 150 % peak (75 W) for 5 s—covers brake coil in-rush (60 W) plus COP display spike (15 W) without over-sizing.
   • < 30 mVpp ripple on 24 V model—keeps encoder signals clean, eliminates position drift.
   • UL 508, IEC 60950-1, EN 81-50 approved; MTBF 700 kh @ 25 °C per Telcordia SR-332.
   • Universal input 85–264 VAC / 120–370 VDC—works on sites with brown-out down to 180 VAC.
2. Part-number decoder (order exactly this, no guessing)
   RS-50-3.3 → 3.3 V / 10 A
   RS-50-5 → 5 V / 10 A
   RS-50-12 → 12 V / 4.2 A
   RS-50-15 → 15 V / 3.4 A
   RS-50-24 → 24 V / 2.1 A (most common for 24 VDC brake & controller)
   RS-50-48 → 48 V / 1.05 A (legacy door motor, PoE lifts)
   All share the same 99 × 82 × 30 mm footprint; +S / –S remote sense pins are fitted on every model.
3. Tools you will need
   • Phillips #2 screwdriver
   • 4 mm flat for DIN-rail clip
   • Torque driver 0.8 N·m (for field terminals)
   • Multimeter with 1 mV resolution
   • Oscilloscope (optional, for ripple check)
   • IR thermometer or thermal camera
   • 2.5 mm² ferrules (strongly recommended—strands break under clamp)
4. Mounting for zero derating
   Snap the RS-50 onto 35 mm DIN rail (TS-35). Maintain 50 mm clearance above and 30 mm below; the lifetime halves for every 10 °C rise. If the cabinet is < 100 mm deep, mount vertically with input terminals down—this allows convection chimney. Never lay the supply flat on its side inside a wiring tray—temperature rises 15 °C and electrolytic life collapses to 2 years. Nanjing Zhuye supplies a free aluminium 1 U bracket (NY-BKT-RS50) for panel-mount when rail space is tight.
5. Wiring & grounding
   Input: 1.5 mm² is enough for 0.3 A @ 230 VAC, but use 2.5 mm² to minimise voltage drop on long risers. Ferrule both ends, torque L/N to 0.8 N·m—loose clamps arc and weld themselves.
   Output: 24 V model needs 1.5 mm² for runs < 5 m; > 5 m upgrade to 2.5 mm² to keep drop < 0.25 V. Connect remote sense (+S to +V at load, –S to 0 V) if load current > 1 A or drop exceeds 0.1 V—this alone prevents 90 % of “low 24 V” callbacks.
   PE: bond the supply’s PE stud to the cabinet earth bar with 4 mm² green/yellow; MEAN WELL Y-capacitor leaks 0.5 mA—floating PE gives 80 V touch voltage and false RCD trips.
6. Power-up & validation
   Apply power, no load: green LED = OK, red = over-temperature or over-load.
   No-load output must be within ±0.2 V of nominal; adjust VR if needed (24 V model range 22–27 V).
   Full-load test: connect 24 Ω, 50 W resistor (≈ 1 A). Ripple < 30 mVpp, temperature rise < 35 °C at 25 °C ambient.
   Elevator functional test: run car to top floor, engage brake, measure 24 V at brake coil—must stay ≥ 22 V. Anything lower shortens coil life and causes late-leveling stops.
7. Lifetime model & replacement cycle
   Electrolytic capacitors are the wear item. MEAN WELL uses 105 °C, 3 000 h caps; at 50 °C Arrhenius predicts 48 000 h. Translate to elevator duty:
   Light traffic (office, 8 h/day, 5 days/week) – 2 080 h/year → replace ≈ 23 years; inspect every 5 years.
   Medium traffic (mall, 12 h/day, 7 days/week) – 4 380 h/year → inspect every 2 years, replace capacitors at year 6, full supply at year 12.
   Heavy traffic (metro, 20 h/day) – 7 300 h/year → inspect every 6 months, replace capacitors every 3 years, full supply every 6 years.
   Fan-less rule: if internal temperature (measured on the heat-sink) exceeds 70 °C, halve the interval. A $15 IR thermometer pays for itself the first prevented callback.
8. Preventive maintenance checklist
   Monthly: visual LED, listen for ticking (arcing input).
   Quarterly: IR scan heat-sink; > 65 °C without load means failing cap or blocked vent.
   Annually: torque test input screws; vibration loosens them.
   Bi-annually: scope ripple at 50 % load; > 100 mVpp means order Nanjing Zhuye capacitor kit (NY-RS50-CAP-KIT: 2 × 470 µF, 200 V + 1 × 100 µF, 35 V).
9. Capacitor replacement on-site (10 min)
   Power down, wait 5 min for bus to fall < 5 V. Remove the two Phillips top screws, slide cover back 5 mm. De-solder old caps, insert new 105 °C low-ESR types (included in kit), polarity stripe toward the label. Re-assemble, re-torque screws 0.4 N·m. Power up, ripple must drop < 30 mVpp—if not, replace full supply.
10. Full-supply swap (5 min)
    Snap old unit off DIN rail, snap new Nanjing Zhuye RS-50 in place. Transfer wires one-by-one to avoid L-N reversal. Power up, verify green LED, run elevator inspection cycle, log serial number and date. Return failed unit in the same box—Nanjing Zhuye recycles: aluminium heat-sink remelted, copper windings smelted, PCB processed for gold/palladium. One recycled supply saves 6 kg CO₂—enough to power the same elevator for a week.
11. Common field faults quick chart
    Symptom: green LED but no output → over-load (remove brake coil short).
    Symptom: red LED cycling → input under-voltage (brown-out < 85 VAC).
    Symptom: LED OK, 24 V drops to 19 V under load → forgot remote sense, or wire gauge too light.
    Symptom: 100 Hz ripple 200 mV → bulk cap failing, order kit or replace supply.
    Symptom: random 0 V bursts → loose input ferrule, arcing, replace wire and re-torque.