Schneider Electric ATV320U55N4B 5.5 kW Variable Speed Drive

ATV320U55N4B Altivar Machine ATV320 drive: what the part number tells you

The ATV320U55N4B is a Schneider Electric Altivar Machine ATV320 variable speed drive. The datasheet describes it as: variable speed drive, Altivar Machine ATV320, 5.5kW, 380 to 500V, 3 phases, book. The ATV320 is positioned by the manufacturer as a drive for complex machines, with integrated Modbus serial and CANopen ports, a built-in EMC filter and STO safety, plus plug-in modules for the common fieldbuses. Seven Star LLC supplies the ATV320U55N4B in Oman and the GCC as an independent supplier based in Muscat.

Reading the code against the datasheet: the ATV320 prefix is the range; the rating characters match the 5.5 kW heavy duty motor power and 14.3 A output current stated in the datasheet; N4 corresponds to the three-phase 400 V class, matching the listed supply of 380 to 500 V (tolerance -15 % / +10 %). The final letter matches the Book format listed for this reference. Always confirm any variant by the complete reference, because neighbouring references differ in power class, format or options.

Technical specifications of the ATV320U55N4B

How the ATV320U55N4B controls the motor

A frequency converter rectifies the incoming AC supply, stores energy on a DC bus and re-creates a three-phase output of adjustable frequency and voltage. For the ATV320U55N4B the datasheet lists a switching frequency of 2 to 16 kHz adjustable; 4 to 16 kHz with derating factor with a nominal value of 4 kHz. Higher switching frequency reduces audible motor noise but increases drive losses, which is why the datasheet notes derating at the upper end.

Motor control is selected by software profile. The datasheet lists Voltage/frequency ratio, 5 points for asynchronous motors. Choosing the profile that matches the load is more important than chasing maximum dynamic performance: a centrifugal pump or fan is normally best served by a variable-torque or energy-saving profile, while conveyors and mixers usually need constant-torque behaviour with enough overload margin.

Where the ATV320U55N4B fits in a control system

Control wiring on the ATV320U55N4B follows the I/O count in the datasheet: 7 discrete inputs, 3 discrete outputs, 3 analogue inputs, 1 analogue output(s) and the relay outputs described in the datasheet relay output(s). Communication is by Modbus serial; CANopen. Optional modules listed: communication module, CANopen communication module, EtherCAT communication module, Profibus DP V1 communication module, PROFINET communication module, Ethernet Powerlink communication module, EtherNet/IP communication module, DeviceNet.

Related parts in the same family are sold by power rating, so siblings of the ATV320U55N4B in the ATV320 series differ mainly in kW, current and enclosure size rather than in functions. The 5.5 kW size has a larger housing than the smallest ATV320 units and is used on mixers, hoists and larger pumps.

Selection and ordering checklist for the ATV320U55N4B

• Motor nameplate: rated power, rated current, voltage and pole count. Size the drive on motor current, not only on kW; the 14.3 A output current of the ATV320U55N4B is the figure to compare.
• Duty class: confirm whether the load is normal duty or heavy duty, because the datasheet gives separate ratings where both exist.
• Supply: confirm the network matches 380 to 500 V (tolerance -15 % / +10 %) and the frequency, and compare prospective short-circuit current with the 22 kA limit.
• Enclosure: the drive has IP20; if the cabinet is dusty or wet, plan the enclosure and filtering accordingly.
• Fieldbus: choose the option card, if one is needed, before ordering and note it in the enquiry.
• Safety: the datasheet lists the safety functions fitted; compare them with your machine risk assessment.

Installation, commissioning and maintenance of the ATV320U55N4B

Mount the drive in the position the datasheet specifies (vertical, within a small tilt tolerance), leave the ventilation space given in the installation manual and keep the ambient inside the range -10 to 50 °C without derating. Oman cabinets that sit near the upper limit in summer need either derating, forced ventilation or an air-conditioned electrical room. Dimensions of this unit are 150 mm (W) x 308.0 mm (H) x 232.0 mm (D) and its net weight is 4.4 kg, which helps when checking cabinet layouts.

Commission in a fixed order: verify supply and motor cabling, run the auto-tuning or enter motor data, set ramps and limits, then configure I/O and communication. Keep a saved parameter file of the final configuration; it shortens replacement time if the unit is ever swapped. Periodic work is simple: clean the heat sink and fan path, check terminal tightness, review fault history and replace fans when the maintenance schedule calls for it.

Typical applications of the ATV320U55N4B in Oman and the GCC

Typical uses are machine builders and OEM skids: conveyors, packaging lines, mixers, hoists, pumps and fans driven by standard asynchronous motors. In Oman and across the GCC the drive meets heat, dust and humidity in water-treatment and desalination plants, oil and gas utilities, district cooling, food factories and general manufacturing. For coastal or sandy sites the cabinet design, filtering and temperature margin decide reliability at least as much as the drive itself.

Information to send with an RFQ for the ATV320U55N4B

• Full reference (ATV320U55N4B) and quantity
• Motor nameplate data and load type
• Supply voltage and frequency, and site altitude and ambient temperature
• Fieldbus and any accessory or option cards
• Required delivery location and timing

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and does not represent itself as an official channel of the manufacturer.