ABB ACS355-03E-02A4-4 Machinery Drive 0.75 kW 2.4 A

0.75 kW machinery drive on frame R1

Rated 0.75 kW at 400 V and 2.4 A, the ACS355-03E-02A4-4 is a type from ABB’s ACS355 line of micro drives for machine builders. Its frame R1 housing is 70 mm wide. Rated 0.75 kW, this is one of the smallest three-phase 400 V types in the family and suits fractional-kilowatt machine axes, small fans and light feeders.

Built-in sequence programming reduces the need for an external PLC on simple drive logic, and speed-compensated stop supports precise stopping. A smooth-start function for permanent magnet motors is patented. Related items: AC drives and the ABB ACS355 page.

Technical specifications

Protection and cooling for ACS355-03E-02A4-4

Torque and speed control figures in the catalogue are a static speed accuracy of 20% of motor nominal slip, a dynamic accuracy below 1% seconds with a 100% torque step, and a torque step rise time below 10 ms. These apply to the 2.4 A drive just as to its siblings, and overload allows 3.6 A for one minute.

Install with the recommended 10 A gG fuse (10 A UL Class T). Heat loss is 50 W (170 BTU/hr) and cooling air flow 13 m3/h (8 ft3/min). The catalogue lists input choke CHK-01, output choke ACS-CHK-B3 and RFI filter RFI-32 for this type. Leave 75 mm of free space above and below.

How to read the type code

The designation splits into series ACS355, phase 03, configuration E, rating 02A4 and voltage 4. Where a different configuration is needed the X in catalogue tables stands for E or U. Optional panels are ordered with +J400 (ACS-CP-A) or +J404 (ACS-CP-C) and only one panel option is allowed.

Size summary for frame R1: 70 mm wide throughout; 169 mm high in IP20 with the NEMA 1 box and hood adding up to 280 mm; 1.2 kg and 1.6 kg respectively. An IP66 / IP67 / UL Type 4X variant (+B063) is listed for this rating on frame R1.

Selection checks for a 0.75 kW axis

Size this drive on motor current rather than on kilowatts alone. Read the full-load current on the motor nameplate at the voltage actually present on site and confirm it sits at or below the 2.4 A continuous rating. Then look at the duty: a small conveyor or feeder that starts loaded, or a fan that must accelerate a heavy impeller, may need the start current and the 3.6 A one-minute overload more often than the stated cycle of once every ten minutes allows. If the duty is near the limit, compare it against the larger ratings in the same family before committing to this type.

Also decide early whether the built-in brake chopper will be used with an external resistor for fast stops, whether the safe torque off input will be wired into the machine safety circuit, and whether the drive logic can live in the built-in sequence programming or needs a PLC. These choices affect the panel wiring diagram and are easier to settle before the panel is built.

Panel installation

Frame R1 is narrow, which helps when several small drives sit side by side on a back plate, but the 75 mm clearance above and below must still be kept clear of trunking and other heat sources. Route motor cables separately from control and signal wiring, use the cable glands and earthing method recommended by ABB for EMC, and fit the recommended fuse type upstream. Where cable runs to the motor are long, check the ABB guidance on the listed output choke.

Commissioning steps

Enter the motor nameplate data, select the control mode, then run the motor uncoupled where possible to confirm direction and identify the motor. Set acceleration and deceleration ramps to suit the mechanics, test every start, stop and speed source, and prove that the safe torque off function removes torque as designed. Save a copy of the final parameter set so a replacement drive can be loaded quickly.

Heat, dust and humidity in Gulf installations

With 50 W of heat to remove for every drive of this rating, cabinet temperature is the first thing to check in Omani summers. Several micro drives in a sealed box add up quickly, and a cabinet in direct sun gains further heat, so the enclosure cooling must be sized on the total load and the site conditions. The IP20 drive needs an enclosure that keeps out wind-blown sand and fine dust; clogged heatsink fins reduce cooling and lead to nuisance trips. Coastal humidity and salt-laden air favour sealed or air-conditioned enclosures and regular inspection of terminals for corrosion.

Routine maintenance

Plan periodic cleaning of the heatsink and cooling fan path, check fan operation, re-torque power terminals during planned outages and review the drive fault log for recurring overcurrent or overtemperature events, which often point to a mechanical or ventilation problem rather than a drive fault.

Documentation and ordering

The source is the ABB machinery drives ACS355 catalog (3AUA0000068569, rev. H), linked from this page. Seven Star LLC supplies the ACS355-03E-02A4-4 on request from Muscat; send the motor nameplate, supply voltage, panel option and fieldbus need with your RFQ, and the quotation will state availability and lead time.

Confirm before ordering: the exact type code (E or U configuration), control panel option, the motor current on your supply and the site conditions. This page does not repeat the control program variants, which are listed in the catalogue.