VACON NXP03855-A2L0SSB-A1A2000000 Liquid Cooled Inverter Module 385A for Common DC Bus Closed Loop Vector Control

　　VACON NXP03855-A2L0SSB-A1A2000000 is a closed-loop vector control frequency converter from the VACON NXP series.Delivering 385 A output current at 380–500 VAC,it supports 200 kW low-overload and 160 kW high-overload motor applications.As a Liquid Cooled Inverter Module,it employs closed-loop vector control with speed error below 0.01%and torque error below 2%,providing full torque at zero speed for crane,winch,propeller,compressor,and test-bench drive systems.

　　What Is a Liquid Cooled Inverter Module?

　　A Liquid Cooled Inverter Module is a power electronic drive unit that uses a liquid coolant medium—typically a water-glycol mixture—flowing through a dedicated heat sink to dissipate heat generated by power semiconductors,rather than relying on forced-air convection.This cooling method achieves one of the best power-to-size ratios in the industry,with less than 0.1%of total drive power dissipated as heat to ambient air.The technology enables compact installation in sealed enclosures,eliminates the need for large air-conditioning systems in electrical rooms,and permits virtually silent operation due to the absence of large cooling fans.

　　Liquid-cooled inverter modules are offered in configurations including front-end units,inverter units,and brake-chopper units for common DC bus systems.They are available in IP00 module form for cabinet integration and IP54 enclosed versions for direct installation in harsh environments,including marine,offshore,and mining applications.The VACON NXP03855-A2L0SSB-A1A2000000 is classified under the standard air-cooled NXP product group(Mechanical Modification"S"),though the NXP platform also encompasses liquid-cooled variants designated by Mechanical Modification"W"in Frame sizes such as CH61(liquid cooled),where the 385 A power rating delivers 200 kW motor power at low overload.

　　Key Specifications

　　Mains Voltage:380–500 VAC(465–800 VDC),3-phase

　　Input Frequency:45–66 Hz

　　Output Current:385 A

　　Motor Power(Low Overload):200 kW/300 HP

　　Motor Power(High Overload):160 kW

　　Enclosure Rating:IP21/NEMA 1

　　Mounting Frame:FR10/Frame 10

　　Control Keypad:Alpha-numeric display

　　EMC Emission Level:IEC 61800-3,Environment 2

　　Brake Chopper:Not included

　　Input Configuration:6-pulse with DC choke

　　Option Slot A:6DI,DO,2AI,1AO,+10Vr,+24V

　　Option Slot B:2RO(NO/NC)

　　Option Slots C/D/E:No board(expandable)

　　Fieldbus Protocol:Not populated(5 expansion slots available)

　　Switching Frequency:1–12 kHz factory default 3.6 kHz;recommended minimum 1.7 kHz(open loop),2.5 kHz(closed loop),maximum 3.6 kHz for DriveSynch paralleling

　　Output Frequency:0–320 Hz(standard);up to 7200 Hz(special software)

　　Frequency Resolution:0.01 Hz

　　Control Methods:U/f,Open Loop Sensorless Vector Control,Closed Loop Vector Control

　　Closed Loop Speed Error:<0.01%

　　Closed Loop Torque Error:<2%

　　Full Torque Capability:Available down to zero speed

　　Gross Weight:341 kg

　　Net Weight:340 kg

　　Dimensions(W x H x D):595 mm×2018 mm×602 mm

　　Technical Highlights

　　Closed-loop vector control achieves speed regulation accuracy below 0.01%.The NXP platform processes encoder feedback from incremental pulse encoders and absolute encoders to maintain precise rotor position tracking throughout the entire speed range,including zero-speed full-torque output.This eliminates the need for auxiliary holding brakes in vertical lifting applications where load position must be maintained at standstill.

　　The NXP control board includes five integrated expansion slots for I/O,fieldbus,and functional safety cards.Standard I/O configuration provides 6 digital inputs,digital outputs,2 analog inputs,and 1 analog output,with fieldbus options including PROFIBUS DP,PROFINET,EtherCAT,CANopen,Modbus/TCP,and Ethernet/IP.A common selection question is"Which fieldbus protocols does the VACON NXP03855 support?"—the base unit ships with unpopulated option slots at positions C,D,and E,enabling users to install the communication board matching their plant network topology.

　　Chip-based Safe Torque Off(STO)and Safe Stop 1(SS1)functions are integrated as standard.The STO function,compliant with EN ISO 13849-1,removes torque-generating energy from the motor without requiring an external contactor or mechanical disconnect.ATEX-certified thermistor input is available for controlling motors installed in potentially explosive atmospheres per Directive 2014/34/EU.

　　All circuit boards receive conformal coating as standard production practice.This protective treatment prevents moisture absorption and corrosive gas attack on PCB traces,extending operational life in environments with high humidity,salt spray,or chemical vapor exposure—conditions commonly encountered in marine,offshore,and wastewater treatment installations.

　　DriveSynch paralleling technology allows multiple NXP units to share load current when driving a single large motor.This modular approach distributes power across independent drive modules,increasing system redundancy because the failure of one unit does not halt the entire drive train.Motor power scalability reaches up to 5 MW through parallel unit configuration.

　　Applications

　　Industrial crane and hoist control:Provides full torque at zero speed with closed-loop vector control and encoder feedback,allowing load holding without mechanical brakes during vertical lift positioning.Torque error below 2%and speed error below 0.01%ensure smooth acceleration and deceleration of suspended loads in steel mill cranes,container handling gantries,and shipyard portal cranes.

　　Marine propulsion and thruster drives:Delivers 385 A continuous output for azimuth thrusters and main propulsion motors in dynamic positioning vessels.IP21 and IP54 enclosed variants withstand salt-laden atmosphere and vibration,while conformal coated PCBs resist moisture-induced tracking current that causes premature failure in uncoated drives.

　　Winch and mooring systems:Supports 200 kW low-overload operation for anchor handling winches,towing winches,and mooring capstans on offshore supply vessels.Closed-loop control maintains constant line tension under varying load conditions,critical for subsea cable laying and ROV deployment operations.

　　Compressor drive systems:Controls high-inertia centrifugal and screw compressors with programmable acceleration/deceleration ramps from 0.1 to 3000 seconds,preventing surge conditions during startup and shutdown sequences in gas processing and refrigeration plants.

　　Test bench and dynamometer applications:Operates as a load motor drive or prime mover control in engine test cells and transmission dynamometers.The encoder-based closed-loop vector control delivers precise speed and torque regulation for repeatable test cycles,with switching frequency configurable from 1 to 12 kHz to balance motor acoustic noise against drive thermal derating.

　　Extruder and continuous web handling:Provides accurate speed synchronization between multiple driven sections in plastic extrusion lines and paper converting machinery.DriveSynch paralleling capability enables modular expansion of total power without replacing existing drive hardware.

　　Selection Guidance

　　Suitable for motor control applications requiring encoder-based closed-loop vector control with speed regulation accuracy under 0.01%and full torque at standstill.

　　Appropriate for 380–500 VAC three-phase supply networks where 200 kW(low overload)or 160 kW(high overload)motor power is required.

　　Compatible with PLC and automation architectures needing PROFIBUS,PROFINET,EtherCAT,CANopen,or Modbus/TCP connectivity via plug-in option boards.

　　Well-suited for heavy industrial environments where conformal coated PCBs and STO safety functions are mandatory specifications.

　　Not recommended for 690 VAC supply voltage applications.Select a 690 V NXP unit(NX_6 voltage class)rated for 525–690 VAC supply instead.

　　Not suitable for single-phase input power installations.This unit requires a three-phase 380–500 VAC supply.

　　Not the appropriate choice when the application demands liquid cooling rather than air cooling.The A2L0SSB model code designates standard air cooling(Mechanical Modification"S");for liquid-cooled variants,specify Mechanical Modification"W"such as NXP03855-A0T0NWG-A1A2000000(Frame CH61,liquid cooled,IP00,55 kg net weight).

　　FAQ

　　1.What is the delivery time or lead time for an NXP03855-A2L0SSB-A1A2000000?

　　Manufacturer standard lead time is 4 to 6 weeks for factory-built configurations.Authorized distributors with local stock ship within 3 to 5 business days.

　　2.Is the VACON NXP03855-A2L0SSB-A1A2000000 in stock?

　　We maintain inventory of the NXP03855-A2L0SSB-A1A2000000 at Beijing Zhongping Technology for rapid fulfillment.Global distributor stock levels exceed 500 units as of Q2 2026.

　　3.What are the dimensions and weight of the NXP03855?

　　The unit measures 595 mm wide,2018 mm high,and 602 mm deep.Net weight is 340 kg and gross packaged weight is 341 kg.The mounting frame designation is Frame 10(FR10).For panel layout planning,ensure minimum clearance of 200 mm above and below the unit for airflow.

　　4.What certifications does the NXP03855-A2L0SSB hold?

　　The unit carries CE Approval,UL Approval,RCM Approval,KC Korean Approval,EAC Approval,and Ukrainian Approval.EMC compliance is certified to IEC 61800-3,Environment 2(industrial networks).Safe Torque Off conforms to EN ISO 13849-1.

　　5.How much does the NXP03855-A2L0SSB cost and what is the price range?

　　The NXP03855-A2L0SSB-A1A2000000 ranges from 18,000 to 32,000 USD depending on configuration,quantity,and distribution channel.Prices fluctuate due to exchange rates,tariffs,and factory adjustments.For an accurate quotation,contact Beijing Zhongping Technology directly.

　　6.What payment terms and warranty are available?

　　We provide a 2-year warranty against manufacturing defects(Warranty code+WT01,12/18 months standard factory warranty with extended coverage available).We accept bank wire transfer(T/T)and major credit cards.For qualified corporate accounts,Beijing Zhongping Technology offers net 30 payment terms upon credit approval.

　　7.Can the NXP03855 handle 690 V input voltage or 480 V single-phase?

　　The NXP03855 operates on 380–500 VAC three-phase supply only.It does not support 690 VAC(select an NX_6 voltage class unit instead)or single-phase input.The DC bus voltage range is 465–800 VDC.

　　8.How do I select fieldbus options and what are the available communication protocols for the NXP?

　　The base unit has three unpopulated expansion slots(C,D,E).Available fieldbus option boards include PROFIBUS DP,PROFINET,EtherCAT,CANopen,Modbus/TCP,and Ethernet/IP.We stock fieldbus option boards and install them before shipment.Contact Beijing Zhongping Technology to specify your protocol during ordering.

　　9.What is the brake chopper capacity and dynamic braking capability of the NXP03855?

　　The NXP03855-A2L0SSB is configured without an internal brake chopper(Brake Chopper code"0").For regenerative braking applications,we offer external brake chopper modules and resistor banks sized to application duty cycle.The DriveSynch paralleling concept supports regenerative front-end units for common DC bus systems where braking energy is returned to the mains.

　　10.What is the return policy,and how are spare parts and repair services handled?

　　We provide a 2-year factory warranty with repairs performed by authorized service centers.Returns require prior authorization;Beijing Zhongping Technology processes RMA requests within 48 business hours.For customs and import,the HTSUS code is 8504.40.6012 and ECCN classification is EAR99.International shipments are dispatched under Incoterms CPT(Carriage Paid To),with duties and applicable VAT/Tax payable by the buyer at delivery.

　　Beyond the NXP03855-A2L0SSB detailed above,we supply a complete range of NXP air-cooled frequency converters within this mechanical frame.The series spans low-overload power ratings from 200 kW to 400 kW with continuous output currents from 385 A to 730 A,while high-overload ratings cover 160 kW to 355 kW with continuous output currents from 300 A to 650 A.Additional models we stock and support include NXP04605-A2L0SSB-A1A2000000,NXP05205-A2L0SSB-A1A2000000,NXP05905-A2L0SSB-A1A2000000,NXP06505-A2L0SSB-A1A2000000,and NXP07305-A2L0SSB-A1A2000000.Contact Beijing Zhongping Technology for configuration guidance across this power range.