VACON NXS03855-A2L0SSB-A1A2000000 Sensorless Vector Frequency Converter Heavy-Duty Industrial AC Drive 385A 380-500V

　　VACON NXS03855-A2L0SSB-A1A2000000 is a Heavy-duty Industrial AC Drive and motor speed controller.Rated 385 A at 380–500 VAC,it drives induction and permanent magnet motors in cranes,compressors,and conveyors.It delivers 150%overload for 60 s and supports open/closed-loop vector control.

　　What Is a Heavy-duty Industrial AC Drive?

　　A heavy-duty industrial AC drive is a variable-frequency drive engineered for applications requiring high starting torque,sustained overload capability,and robust thermal management when controlling three-phase AC motors.These drives are classified by overload ratings—heavy-duty(HD)mode typically delivers 150%of nominal current for 60 seconds—and are designed for constant-torque machinery such as extruders,mixers,and lifting equipment.

　　The VACON NXS03855 is part of the Vacon NXS series,positioned for demanding industrial environments where reliable motor control,harmonics mitigation,and flexible fieldbus integration are required.It provides both open-loop vector control and closed-loop vector control(with an optional encoder interface)for applications demanding precise speed regulation.

　　Key Specifications

　　Input Voltage Range:380 to 500 VAC,3-phase,50/60 Hz

　　Rated Output Current(Heavy Duty):385 A

　　Overload Capacity:150%for 60 s,200%for 2 s(per manufacturer datasheet)

　　Motor Power Rating(Typical,400 V):250 kW

　　Output Frequency Range:0 to 320 Hz

　　Control Methods:V/f,Open-Loop Vector,Closed-Loop Vector(with optional encoder board)

　　Speed Control Accuracy(Closed-Loop Vector):±0.01%of rated speed(with encoder feedback)

　　Torque Response Time:<5 ms(vector mode)

　　Enclosure Protection Class:IP21(standard),IP54(with optional kit)

　　Ambient Operating Temperature:-10°C to+50°C(derating above 40°C)

　　Relative Humidity:5%to 95%non-condensing

　　EMC Compliance:EN 61800-3 Category C3(industrial environment)

　　Approvals:CE,cULus,RCM

　　Mounting:Cabinet mounting or flange mounting(optional)

　　Dimensions(Standard IP21,W x H x D):444 mm×1015 mm×356 mm(approximate,per manufacturer drawing)

　　Weight:100 kg(approximate,per datasheet)

　　Fieldbus Communication:Supports PROFIBUS DP,DeviceNet,CANopen,Modbus RTU,Ethernet/IP via plug-in option boards

　　Technical Highlights

　　150%overload for 60 seconds enables direct across-the-line replacement of older DC drives without motor derating.This capacity supports cold-starting high-inertia loads common in crushers and centrifuges.

　　Integrated DC choke reduces total harmonic current distortion(THDi)to below 40%at full load.The choke is embedded in the drive enclosure,eliminating external line reactors and reducing panel space requirements.

　　An engineer may ask:Can this drive operate motors with long cable lengths?The answer is yes—the inverter uses an adaptive motor model and dU/dt filtering,allowing motor cable lengths up to 300 m with standard unshielded cables,per Vacon motor compatibility guidelines.

　　Automatic energy optimization algorithm reduces motor flux at light loads,delivering up to 5%additional energy savings in variable-torque fan and pump applications.

　　Conformal-coated circuit boards(option A2 in the product code)provide extended protection against corrosive gases and humidity,meeting the IEC 60721-3-3 3C2 environmental classification for harsh chemical atmospheres.

　　Applications

　　Overhead cranes and hoists:Provides 200%starting torque at zero speed using closed-loop vector control with encoder feedback.The anti-sway function minimizes load swing during traverse,reducing mechanical stress by up to 30%.

　　Rotary compressors:Maintains constant air pressure via PID control with±0.5%steady-state accuracy.Built-in energy optimizer reduces power consumption by 7–10%compared to mechanical unloader regulation.

　　Belt conveyors:Enables soft start and stop sequences to limit belt tension and extend idler bearing life.Overload detection protects against jammed material without nuisance tripping.

　　Industrial mixers and extruders:Handles 150%torque for up to 60 s during batch start-up with high-viscosity materials.Frequency skip function bypasses mechanical resonance points to protect gearboxes.

　　Centrifuges and separators:Accelerates high-inertia drums within configurable ramp times.DC injection braking dissipates rotational energy without requiring external braking resistors for moderate dumpload applications.

　　Selection Guidance

　　Suitable for three-phase 380–500 VAC supply networks operating heavy-duty constant-torque machinery with motor shaft powers up to 250 kW(at 400 V).

　　Correct choice when the application requires 150%current headroom for frequent starts,reversals,or shock loading—typical in steel rolling lines and mining conveyors.

　　Appropriate for cabinet installations with available forced-air ventilation.The IP21 rating requires the drive to be mounted inside a control cabinet with filtered cooling air.

　　Not recommended for 690 VAC supply systems.Select the 6-pulse 690 V variant within the same NXS series or use an NXP drive frame for 690 V heavy-duty applications.

　　Not suitable for single-phase input power or motor loads below 160 kW where a lower current drive from the NXL or NXC range provides a better cost-to-performance ratio.

　　Avoid using with non-shielded motor cables longer than 300 m unless output filters are added.Excessive cable capacitance can degrade vector control performance and trigger overcurrent faults.

　　FAQ

　　1.What is the weight and dimensions of VACON NXS03855-A2L0SSB-A1A2000000?

　　The standard IP21 unit measures approximately 444 mm wide,1015 mm high,and 356 mm deep with a weight of around 100 kg.Exact dimensional drawings and shipping weight are provided by Beijing Zhongping Technology upon quotation request.

　　2.How much does VACON NXS03855 cost?What is the price range?

　　The VACON NXS03855-A2L0SSB-A1A2000000 typically ranges from12,000to18,000 USD depending on installed options,quantity,and regional distribution.Prices fluctuate due to exchange rates,tariffs,and factory adjustments.For an accurate quotation,contact Beijing Zhongping Technology directly.

　　3.What is the delivery time or lead time for the VACON NXS03855?

　　We hold safety stock of the VACON NXS03855 at Beijing Zhongping Technology,enabling shipment within 3 to 5 business days for standard configurations.Factory lead time for non-stock option codes is 6 to 8 weeks from  VACON production.

　　4.Is the VACON NXS03855-A2L0SSB-A1A2000000 in stock?

　　Yes,Beijing Zhongping Technology inventories this drive in our Shanghai warehouse.Current stock availability is confirmed with order placement,and we provide same-day dispatch for orders received before 14:00 CST.

　　5.What payment terms do you accept for purchasing the VACON NXS03855?

　　We accept T/T(wire transfer),irrevocable L/C at sight,and major trade platforms.For qualified enterprise buyers,Beijing Zhongping Technology offers net 30 terms subject to credit evaluation.

　　6.What enclosure protection does a heavy-duty industrial AC drive typically require?

　　Standard heavy-duty drives ship with IP21/IP20 protection for cabinet mounting.For dusty or humid environments,an IP54 upgrade kit includes a sealed enclosure and cable gland plates.Drives undergoing frequent washdowns require an external NEMA 4X-rated cabinet.

　　7.What is the difference between heavy-duty and normal-duty AC drive ratings?

　　Heavy-duty(HD)rating specifies 150%overload for 60 seconds,suitable for constant-torque loads.Normal-duty(ND)specifies 110–120%overload for 60 seconds,intended for variable-torque loads such as centrifugal fans and pumps.The same drive frame can be assigned to either duty by configuring the motor current rating in the setup menu.

　　8.How do I size a motor speed controller for a compressor or crane application?

　　Select a drive with a rated HD current equal to or greater than the motor nameplate full-load current.Factor in altitude derating—above 1000 m,reduce output current by 1%per 100 m.Always apply the service factor if the motor operates continuously at over 90%load.

　　9.What is the warranty period for Vacon drives like the NXS03855?

　　We provide a 2-year warranty from the date of shipment for manufacturing defects.Beijing Zhongping Technology offers a 5-year extended warranty plan with annual preventive maintenance inspection included.

　　10.What are the customs clearance and import documentation requirements for an industrial AC drive shipped internationally?

　　All international shipments include the commercial invoice,packing list,and a certificate of origin.The HTSUS code for this equipment class is 8504.40.4020.We ship under Incoterms CPT;import duties and VAT are the buyer’s responsibility and payable at the destination port.

　　In addition to the NXS03855 detailed above,we supply a complete family of Vacon NXS heavy-duty industrial AC drives spanning a broad power envelope.All listed models operate within the following performance boundary:

　　Light overload power:200–400 kW

　　Light overload continuous current:385–730 A

　　Heavy overload power:160–355 kW

　　Heavy overload continuous current:300–650 A

　　Models available from Beijing Zhongping Technology include:

　　NXS03855-A2L0SSB-A1A2000000

　　NXS04605-A2L0SSB-A1A2000000

　　NXS05205-A2L0SSB-A1A2000000

　　NXS05905-A2L0SSB-A1A2000000

　　NXS06505-A2L0SSB-A1A2000000

　　NXS07305-A2L0SSB-A1A2000000