Schneider ATV320U55N4B – 5.5 kW Variable Speed Drive | Altivar Machine ATV320 Series
Engineering Background
The Altivar Machine ATV320 series represents Schneider Electric’s dedicated variable speed drive platform engineered for machine builders and OEM integrators. Designed to meet the demanding cycle requirements of industrial machinery, the ATV320 combines compact form factor with full-featured motor control — making it the preferred choice for engineers who need reliable, spec-compliant drives without over-engineering the BOM.
Product Positioning
The ATV320U55N4B is the 5.5 kW, 3-phase 380–500 V, book-mount (IP20) variant of the ATV320 family. It is optimized for constant-torque and variable-torque applications including conveyors, packaging lines, hoists, compressors, and pumps. Its native fieldbus support and embedded safety functions make it a drop-in fit for both standalone machine control and distributed automation architectures.
Complete Technical Specifications
| Part Number | ATV320U55N4B |
| Brand | Schneider Electric |
| Series | Altivar Machine ATV320 |
| Motor Power (kW) | 5.5 kW |
| Motor Power (HP) | 7.5 HP |
| Supply Voltage | 3-phase 380–500 V AC ±10% |
| Output Current (Nominal) | 13.7 A |
| Output Current (Max Transient) | 20.6 A (150% for 60 s) |
| Supply Frequency | 50/60 Hz |
| Output Frequency Range | 0.1–500 Hz |
| Control Method | V/f, Sensorless Flux Vector (SVC), Closed-loop Flux Vector (FVC) |
| Mounting Style | Book (side-by-side, IP20) |
| Protection Rating | IP20 |
| Ambient Temperature | -10°C to +50°C (derating above 40°C) |
| Storage Temperature | -25°C to +70°C |
| Altitude | Up to 1000 m (derating above) |
| Communication Protocols | Modbus RTU (embedded), CANopen (embedded) |
| Safety Function | STO (Safe Torque Off) — IEC 61800-5-2, SIL 2 / PLd |
| Digital Inputs | 6 × DI (24 V DC logic) |
| Analog Inputs | 2 × AI (0–10 V / 0–20 mA) |
| Relay Outputs | 2 × relay (R1, R2) |
| Analog Output | 1 × AO (0–10 V / 0–20 mA) |
| Braking | Internal braking transistor (external resistor required) |
| EMC Filter | Integrated (Category C2) |
| Dimensions (H×W×D) | 270 × 72 × 156 mm |
| Weight | Approx. 2.5 kg |
| Certifications | CE, UL, cUL, RoHS |
| Standards | IEC 61800-5-1, IEC 61800-3, EN 55011 |
Proven Application Environments
- Conveyor & Material Handling: Precise speed regulation for belt conveyors, roller tables, and sortation systems.
- Packaging Machinery: High dynamic response for filling, sealing, and labeling lines requiring tight speed synchronization.
- Pump & Fan Control: Variable-torque mode with energy-saving algorithms for HVAC and process fluid systems.
- Hoist & Crane: STO safety function and flux vector control for safe, controlled lifting operations.
- Compressors: Stable low-speed torque delivery for screw and reciprocating compressor soft-start applications.
- Textile & Printing: Smooth acceleration/deceleration profiles for tension-sensitive web handling.
Engineering Advantages
- Embedded Dual Fieldbus: Modbus RTU and CANopen on a single unit — no option card required, reducing panel wiring complexity and BOM cost.
- STO Safety Integration: Hardware-level Safe Torque Off eliminates the need for external safety contactors in SIL 2 / PLd architectures.
- Book-Mount Topology: 72 mm width enables high-density panel layouts; side-by-side mounting without derating up to 40°C.
- Sensorless Vector Control: Delivers ≥150% starting torque at 0.5 Hz without encoder feedback — ideal for retrofit applications.
- Integrated EMC Filter: Category C2 filter eliminates a separate line filter in most industrial installations.
- Graphical Keypad Compatible: Optional VW3A1101 display for local commissioning and parameter copy across multiple drives.
System Architecture & Signal Flow
The ATV320U55N4B fits into a standard machine control architecture as follows:
- Power Stage: 3-phase 400 V supply → integrated EMC filter → rectifier bridge → DC bus → IGBT inverter → motor terminals (U/V/W).
- Control Layer: PLC/HMI communicates via Modbus RTU or CANopen over RS-485/CAN bus. Speed reference and run/stop commands are issued digitally, eliminating analog signal noise.
- Safety Channel: STO inputs (STO1/STO2) are wired to the safety relay or safety PLC output. On STO activation, gate pulses are inhibited within <10 ms — motor coasts to stop without mechanical brake engagement.
- Feedback Path: Analog output (AO) mirrors actual output frequency or current back to the PLC for process monitoring and closed-loop control.
Sourcing & Quality Verification
- All units sourced through verified industrial distribution channels with full traceability to Schneider Electric’s authorized supply network.
- Each unit undergoes incoming inspection: label verification, firmware version check, and functional power-on test prior to dispatch.
- Original factory packaging, serial number, and CE/UL markings intact — no remarked or refurbished units.
- Batch documentation (test reports, country of origin certificates) available upon request for regulated procurement environments.
Procurement Process
- Step 1 — Inquiry: Submit your BOM or part number via support@konmask.com or WhatsApp +0086 19859288691 for lead time and volume pricing confirmation.
- Step 2 — Quotation: Formal quotation issued within 1 business day, including unit price, freight options (DHL/FedEx/sea freight), and estimated delivery window.
- Step 3 — Order Confirmation: Place order via the Konmask storefront or via proforma invoice for bank transfer / L/C payment.
- Step 4 — Dispatch & Tracking: Units shipped with commercial invoice, packing list, and tracking number. Export documentation (CO, Form E) available for applicable trade lanes.
- Step 5 — After-Sales: 12-month warranty against manufacturing defects. Technical support available for commissioning and parameter configuration queries.
Technical FAQ
Q: Can the ATV320U55N4B control a 4-pole 5.5 kW motor at full torque from 0 Hz?
A: In sensorless vector (SVC) mode, the drive delivers approximately 150% nominal torque at 0.5 Hz. For true zero-speed holding torque, closed-loop flux vector (FVC) mode with an encoder feedback card is recommended.
Q: Is an external EMC filter required for CE compliance?
A: No. The integrated Category C2 EMC filter meets EN 55011 Class A requirements for industrial environments. For residential/light-industrial (Class B) installations, an additional external filter may be required.
Q: Can multiple ATV320U55N4B drives share a common DC bus?
A: The ATV320 book-mount range supports DC bus sharing via the DC bus connector, enabling regenerative energy exchange between drives and reducing overall energy consumption in multi-axis systems.
Q: What is the minimum cable cross-section for the motor output at 5.5 kW / 400 V?
A: Per IEC 60364-5-52, a minimum of 2.5 mm² (Cu) shielded motor cable is recommended. For cable runs exceeding 50 m, consult the ATV320 installation guide for derating and dV/dt filter requirements.
Q: Is the STO function certified for use in safety-rated machinery?
A: Yes. The STO function is certified to IEC 61800-5-2, achieving SIL 2 (IEC 62061) and PLd / Category 3 (ISO 13849-1). A Functional Safety data sheet is available from Schneider Electric upon request.
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