Description

Otis Elevator Inverter OVF20CR GCA21342B1 5KW  Brief Introduction

1. What OVF20CR Really Does

• Input: 3 × 380–480 VAC, 50/60 Hz
• Output: 3 × 0–400 VAC, 0–100 Hz, 29 A continuous (150 % for 60 s)
• Regeneration: four-quadrant IGBT bridge feeds 95 % of braking energy back to mains
• Built-in 3 % line reactor — THD <5 %, meeting IEEE-519 without external filters
• Integrated brake chopper 220 A peak for 4 Ω resistor — no extra hardware
• CAN-open 125 kbit/s + 0–10 V analogue for Otis and third-party MCUs

2. Where It Is Used

• Otis Gen2®-R2, Gen2-Life® 1.0–2.0 m s⁻¹ with PM machines 11–20 kW
• SkyRise® MRL up to 30 floors
• Thyssen Synergy® Evolution® retrofits
• Chinese MRL controllers with 400 V class permanent-magnet motors
• Simplex or group (≤8 cars) with duty cycles up to 1,000 starts day⁻¹

3. Commissioning – 20-Minute Start-Up

1. Mount on 35 mm DIN rail; leave 150 mm air gap above.
2. Install 40 A moulded-case breaker; torque lugs to 2.5 N·m.
3. Wire motor U/V/W through shielded cable; earth both ends.
4. Connect brake resistor to B+/B-; set jumper J3 to “400 V 4 Ω”.
5. Plug 4-way CAN: H/L/Shield/0 V; terminate 120 Ω if last node.
6. Apply 24 VDC control; display shows “0.0”.
7. Enter motor name-plate via keypad:
   • Pn = motor kW
   • Un = 400 V
   • In = motor amps
   • nn = rated rpm
8. Perform static auto-tune: press RUN; inverter rotates 1/8 turn, stores stator resistance.
9. Save parameters to EEPROM (P1.07 = 1); run full-speed inspection; verify current <110 % In.

4. Daily Operation – What the Inverter Actually Does

• Updates torque loop every 250 µs; speed ripple <0.02 %
• Auto-compensates for rope stretch; stores creep data every trip
• Built-in PTB brake test: weekly 150 % torque for 2 s, logs result for inspector
• Fan on-demand: only runs >45 °C — machine-room noise <55 dB(A)

5. Replacement Cycle & Preventive Maintenance

• High-traffic office (>1,000 starts day⁻¹) – blow dust every 3 months, replace inverter every 8 years
• Residential tower (300–600 starts day⁻¹) – inspect annually, replace every 12 years
• Low-rise freight (≤200 starts day⁻¹) – inspect every 18 months, replace every 15 years

• DC bus voltage swings >750 V or <450 V under load
• IGBT thermal sensor >85 °C with fan running
• Brake chopper faults ≥3 times in 30 days
• Capacitor bulge or ESR >150 % of spec
• “932 SBSB Fault” persistent (internal IGBT desaturation)

6. Extending Life – 3 Pro Tips

1. Keep ambient <40 °C; every 10 °C rise halves capacitor life
2. Torque lugs annually; loose connections cause arcing and ozone
3. Run built-in capacitor test (P9.21) every 6 months; logs capacitance trend

7. Why Buy OVF20CR from Nanjing Zhuye Elevator Parts?

• Factory-new, not refurbished; passes 4 h burn-in at 60 °C full load
• Built-in 3 % line reactor — no extra purchase
• Dual stock: 90 pcs Nanjing, 30 pcs Dubai — next-day air to 65 countries
• Bundle kit: inverter + 4 Ω brake resistor + 3 m shielded motor cable — 8 % discount
• 24 months warranty, return & replace, no factory RMA
• 7×24 WhatsApp/WeChat video support; average response 12 min

Conclusion