Schneider Electric ATV320 Drives: ATV320U55N4B

Technical Dossier

Product Details And Specifications

Schneider Electric ATV320 Series Technical Notes

The Schneider Electric Altivar ATV320 series is a compact variable speed drive (VSD) platform engineered for asynchronous and synchronous motors in the 0.18 kW to 15 kW power range. Deployed across global heavy industry — including petrochemical refineries, water treatment facilities, pharmaceutical manufacturing, and nuclear auxiliary systems — the ATV320 occupies a critical position in process automation infrastructure. Its DIN rail and wall-mount form factors, combined with native fieldbus integration (CANopen, Modbus RTU, EtherNet/IP, PROFIBUS DP, PROFINET), make it a standard-fit replacement and upgrade path for legacy Altivar 312 and Altivar 32 installations. The ATV320U55N4B specifically is a 5.5 kW, 380–500 V three-phase drive in a book-mount enclosure, widely specified in pump and fan control panels across EMEA and Asia-Pacific industrial sites.

The Evolution of ATV320 Architecture

The ATV320 was introduced by Schneider Electric as the successor to the Altivar 312 and Altivar 32 platforms, consolidating two product lines into a single unified drive architecture. Early Altivar drives (ATV11, ATV18, ATV28) used proprietary analog control boards with limited fieldbus options. The ATV312 generation introduced Modbus RTU as standard and optional CANopen. The ATV32 added a modular I/O expansion system and STO (Safe Torque Off) safety function per IEC 61800-5-2.

ATV320 Full Catalog & Functionalities (SKU List)

The following SKUs represent the core ATV320 product range, organized by power rating, supply voltage, and enclosure type. All units include integrated STO, Modbus RTU, and CANopen as standard.

ATV320U02M2C: 0.18 kW, 200–240 V 1-phase, compact book-mount enclosure.
ATV320U04M2C: 0.37 kW, 200–240 V 1-phase, compact book-mount, DIN rail mountable.
ATV320U06M2C: 0.55 kW, 200–240 V 1-phase, compact book-mount enclosure.
ATV320U11M2C: 1.1 kW, 200–240 V 1-phase, compact book-mount, integrated EMC filter.
ATV320U22M2C: 2.2 kW, 200–240 V 1-phase, compact book-mount enclosure.
ATV320U04N4B: 0.37 kW, 380–500 V 3-phase, book-mount, standard I/O configuration.
ATV320U06N4B: 0.55 kW, 380–500 V 3-phase, book-mount enclosure, STO standard.
ATV320U11N4B: 1.1 kW, 380–500 V 3-phase, book-mount, Modbus RTU + CANopen standard.
ATV320U15N4B: 1.5 kW, 380–500 V 3-phase, book-mount, suitable for conveyor and pump duty.
ATV320U22N4B: 2.2 kW, 380–500 V 3-phase, book-mount, standard panel integration.
ATV320U30N4B: 3.0 kW, 380–500 V 3-phase, book-mount, common HVAC and pump application.
ATV320U40N4B: 4.0 kW, 380–500 V 3-phase, book-mount enclosure, DIN rail compatible.
ATV320U55N4B: 5.5 kW, 380–500 V 3-phase, book-mount — this listing's primary SKU; widely used in industrial pump and fan control panels.
ATV320U75N4B: 7.5 kW, 380–500 V 3-phase, book-mount, higher-current output stage.
ATV320D11N4B: 11 kW, 380–500 V 3-phase, book-mount, suitable for compressor and mixer duty.
ATV320D15N4B: 15 kW, 380–500 V 3-phase, book-mount, top of the standard ATV320 power range.
ATV320U55N4W: 5.5 kW, 380–500 V 3-phase, wall-mount enclosed variant with integrated disconnect.
ATV320U75N4W: 7.5 kW, 380–500 V 3-phase, wall-mount enclosed variant.

Quality Control for the ATV320 Range

The ATV320 drive architecture incorporates a multi-layer power and control board assembly with a dedicated IGBT power module, DC bus capacitor bank, and a separate control PCB communicating via an internal ribbon interface. DriveKNMS applies the following test protocol to all ATV320 units processed through its facility:

1. Visual and mechanical inspection: Enclosure integrity, terminal block condition, fan operation (where fitted), and connector seating verification.
2. DC bus pre-charge and capacitor ESR check: Confirms capacitor bank health prior to full power application.
3. No-load power-up test: Drive powered at rated input voltage; control board boot sequence, display function, and parameter access verified.
4. Motor simulation load test: Output frequency sweep from 5 Hz to 50 Hz under resistive load; output voltage symmetry and current balance measured on all three phases.
5. STO function verification: STO input channels tested per IEC 61800-5-2 requirements; drive confirms safe state on STO activation.
6. Fieldbus communication check: Where communication cards are fitted, Modbus RTU and CANopen node address response verified.
7. Final parameter reset: Drive returned to factory default configuration prior to shipment.