AU320 Simple VFD (and AU321)

Published model table

Model	Published rating
AU320-0.75S1	0.75 kW — 3.8 A; 170×79×127 mm
AU320-1.5S1	1.5 kW — 7 A; — (not stated separately in the source table)
AU320-2.2S1	2.2 kW — 9 A; 187×86×144 mm
AU320-3.0S1	3.0 kW — 13 A; 216×101×151 mm
AU320-4.0S1	4.0 kW — 15 A; 237×111×168 mm
AU320-5.5S1	5.5 kW — 20 A; —
AU320-0.75S3	0.75 kW — 3.8 A; 170×79×127 mm
AU320-1.5S3	1.5 kW — 7 A; —
AU320-2.2S3	2.2 kW — 9 A; 187×86×144 mm
AU320-3.0S3	3.0 kW — 13 A; 216×101×151 mm
AU320-4.0S3	4.0 kW — 15 A; 237×111×168 mm
AU320-5.5S3	5.5 kW — 20 A; —
AU320-0.75G3	0.75 kW — 2.1 A; 170×79×127 mm
AU320-1.5G3	1.5 kW — 3.8 A; —
AU320-2.2G3	2.2 kW — 5.1 A; 187×86×144 mm
AU320-3.0G3	3.0 kW — 7.1 A; —
AU320-4.0G3	4.0 kW — 9 A; 216×101×151 mm
AU320-5.5G3	5.5 kW — 12.6 A; —
AU320-7.5G3	7.5 kW — 16.1 A; 237×111×168 mm
AU320-11G3	11 kW — 25 A; 249×143×172 mm

Input classes per the published AU320 table header: S1 = single-phase 200–240 V input (DC 150–400 V MPPT); S3 = three-phase 200–240 V input (DC 150–400 V MPPT); G3 = three-phase 340–440 V input (DC 250–800 V MPPT). AU320 output is three-phase 0–240 V (S1/S3) or 0–440 V (G3) at 0–400 Hz. Dimensions above are the overall L×D×H figures where the source table states them.

Functions (published)

• Control: V/F control and open-loop vector control (OLVC); built-in PID software function; simple PLC function.
• Inputs/outputs: dual analogue inputs, per the product item. The AU320 baseline does not publish an RS485 option — see the AU321 below.
• Protection: overcurrent, overvoltage, overload, phase loss and short circuit, with output phase loss and over-temperature protection in the feature list.
• AVR: output voltage regulation (AVR) function published.
• MPPT: DC input ranges published in the AU320 model table header (150–400 V on S1/S3 rows; 250–800 V on G3 rows).
• AU321: on the AU320 basis, adds braking, an RS485 Modbus communication function and temperature protection.

Published applications

The series' product material names its application examples directly: smart small water pumps and engraving machines are the examples it gives for the multi-scene small machines the series serves. Engraving duty is collected on the spindle page.

Reading the model code

The model code carries the specification. In AU320-2.2S1, the number is the power in kilowatts (2.2 kW) and the suffix is the input class: S1 for single-phase 200–240 V input, S3 and G3 for the three-phase-input rows. The current printed beside each row is the model's published output current — 9 A for the 2.2S1 — and the dimension column prints the unit's overall dimensions (170×79×127 mm on the smallest frame, growing to 249×143×172 mm on the 11 kW G3 row).

The simple PLC and PID functions

Two built-in functions lift the AU320 above a plain speed control in its published function set: the simple PLC function and the built-in PID software function — both named in the series' product item, together with the dual analogue inputs and the AVR output-voltage-regulation function.

Frequently asked questions

AU320 or AU321?

The documented difference between the two is functional: on the AU320 basis, the AU321 adds RS485 Modbus communication, a built-in braking unit and temperature protection, per the series documentation. Both share the published model envelope.

Is the AU320 suitable for a pump?

Its platform listing includes a one-to-one pump configuration with constant-pressure water supply function, and built-in PID is documented. For multi-pump sets, the dedicated pump lines on the pump page are the fuller answer.