Description

STEP Elevator AS320 Inverter Brief Introduction

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Product Name:	STEP Elevator AS320 Inverte
Model Number:	STEP AS320 Inverter
Brand:	Otis elevator lop call box
Feature:	100% Original New
Guarantee:	One-Year Free Guarantee
Delivery Time:	3-5working days once get the payment

STEP Elevator Inverter AS320 – The 32-Bit Vector Drive That Turns 220 V into Whisper-Quiet Rides
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.

Every silky acceleration in a modern passenger lift begins with a palm-sized green box mounted inside the controller — the STEP AS320 elevator inverter. This 32-bit, vector-controlled drive delivers 2.2–45 kW of silky torque while regenerating up to 95 % of braking energy back into the mains. Originally engineered for STEP SkyBlue®, SkyGreen® and Chinese super-MRL systems, it is now the universal retrofit for any controller demanding silent, energy-saving performance. Nanjing Zhuye Elevator Parts keeps factory-sealed AS320 units in anti-static stock for next-day despatch. Below we explain what the inverter does, how to commission it in under 20 minutes, and the replacement cycle that prevents expensive “AS320 Fault” call-backs.

1. What AS320 Really Is

Power Range: 220–380 VAC, 2.2–45 kW, 150 % overload for 60 s
Control: 32-bit DSP, vector torque loop 50 µs, speed loop 500 µs
Output: 0–400 V, 0–320 Hz, 95 % regeneration efficiency
Interfaces: RS-485 115 kbit/s + 0–10 V speed reference, incremental encoder 1,024 ppr
Protection: IP20 PCB, over-current, over-temp, under-voltage, short-circuit
Size: 180 × 130 × 55 mm (2.2 kW) — DIN-rail or chassis mount
Firmware: pre-loaded V3.10; checksum matches STEP original 0xA3B4

If the inverter trips, the car coasts, the display shows “AS320 Fault” and the controller logs “EF9 Drive Over-Current”.

2. Where It Is Used

STEP SkyBlue®, SkyGreen® 1.0–4.0 m s⁻¹ with PM machines 2.2–45 kW
Thyssen TCM-MC3 retrofit kits
Chinese super-MRL controllers with 220–380 V class motors
Suitable for 1–64 floors, simplex or group (≤8 cars)

3. Commissioning – 20-Minute Plug-and-Play

Safety: lock main breaker, discharge DC bus <50 V, tag out.

Remove old AS320 — undo 4 DIN-rail clips; unplug 40-way ribbon, 6-way CAN, 4-way motor.
Inspect bus bars — if burnt >1 mm, replace copper (Nanjing Zhuye part CB-BUS-45A).
Insert AS320 — snap until latches click; reconnect all keyed plugs.
Connect brake resistor to B+/B-; set jumper J3 to “400 V 4 Ω”.
Apply 24 V control — green LED blinks 1 Hz while loading parameters, then steady.
Auto-tune: press and hold TUNE for 3 s; inverter rotates 1/8 turn, stores stator resistance.
Run full-speed inspection — verify current <110 % rated, regeneration 95 %.

No oscilloscope is required; firmware is pre-flashed to match STEP checksum.

4. Daily Operation – What the Inverter Actually Does

Updates torque every 50 µs; speed ripple <0.02 % — passengers feel nothing
Auto-compensates for rope stretch; stores creep data every trip
Built-in 24 h self-test — if DC bus ripple >5 V, “AS320 Ripple Fault” is logged
Regenerative braking feeds 95 % of braking energy back to mains — saves 15 % power
Temperature sensor derates current above 70 °C — no summer shutdowns

5. Replacement Cycle & Preventive Maintenance

High-speed 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

Replace immediately if:

DC bus >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
“EF9 Drive Fault” persistent (internal IGBT desaturation)

6. Extending Life – 3 Pro Tips

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

7. Why Buy AS320 from

?

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 against IGBT failure or over-temperature
7×24 WhatsApp/WeChat video support; average response 12 min

Conclusion

The STEP AS320 inverter is the invisible powerhouse that turns mains power into silky elevator motion while giving 95 % of braking energy back to the grid. A single IGBT fault can park a car for hours. Keep a spare AS320 from Nanjing Zhuye on every service truck, swap it on schedule, and replace “AS320 Fault” panic with a fifteen-minute planned fix — one smooth, energy-saving ride at a time.

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STEP Elevator Inverter AS320