ABB ACS550-01-012A-4 AC Drive 5.5 kW 11.9 A

5.5 kW wall-mounted ACS550 on frame R1

The ACS550-01-012A-4 delivers 11.9 A continuously for a typical 5.5 kW motor and belongs to ABB’s ACS550-01 range for wall mounting. Frame R1, 125 mm wide by 212 mm deep, houses it. Heavy-duty use is rated 8.8 A for 4 kW. On the smallest frame, R1, this rating suits small pump sets, ventilation fans and light conveyors with motor nameplates around 11 A at 400 V.

The patented swinging choke matches inductance to load and, according to the catalogue, reduces total harmonic distortion by up to 25%. Together with the built-in EMC filter (category C2 first environment, and C3), the drive often avoids external filters. Related products: AC drives and the ABB ACS550 page.

Technical specifications

Protection and cooling for ACS550-01-012A-4

Two figures describe this drive: 11.9 A for 5.5 kW and 8.8 A for 4 kW in heavy duty. Overloads of 10% and 50% respectively are allowed for one minute in ten. Output frequency, control mode and the brake chopper decide the rest; the chopper is built in up to 11 kW, so the ACS550-01-012A-4 has it built in.

Recommended input fuses are 16 A gG (IEC) or 15 A UL Class T. Heat loss is 172 W (587 BTU/hr) and the cooling air flow is 44 m3/h (26 ft3/min). Without an output choke the maximum motor cable length is 100 m; with the recommended NOCH-0016-6X choke (19 A thermal current) it is 150 m. Keep 200 mm free above and below a wall-mounted unit.

How to read the type code

The designation has four parts, ACS550, 01, 012A and 4, followed by optional plus codes. ABB prints B055 (IP54), J404 (basic panel ACS-CP-C), 0J400 (no panel), L511 (OREL-01) and K454 (RPBA-01 PROFIBUS DP), among others. Leave options out for the standard IP21 drive with the assistant panel.

If the drive will see dust or splashes, choose B055; the frame R1 housing then measures 461 x 213 x 234 mm and weighs 8 kg. The IP21 form is 369 mm tall with the connection box, 125 mm wide, 212 mm deep and 6.5 kg. One fieldbus slot is available, so choose the network adapter before ordering.

Normal duty or heavy duty: selecting the ACS550-01-012A-4

The same hardware carries two ratings, and the right one depends on the load profile. Centrifugal pumps and fans, whose torque demand rises gradually with speed, normally fall under normal use, where this unit drives a 5.5 kW motor. Loads that start under full torque or see shock loading, such as loaded conveyors, mixers or positive-displacement pumps, belong under heavy-duty use, where the same unit is matched to a 4 kW motor. Picking the wrong duty is a common reason for a drive that trips at start-up despite looking correctly sized on paper.

• Read the motor nameplate current at the site voltage and compare it with the applicable rating.
• Ask whether the machine must stop quickly; if so, plan a braking resistor for the built-in chopper.
• Measure the real cable route length before deciding whether the output choke is needed.
• Choose IP21 or IP54 according to where the drive will hang, not according to price alone.

Installation and commissioning steps

Mount the drive on a flat, non-flammable wall or panel plate with the cooling air flowing from bottom to top, respecting the free space already noted above and below the unit. Use a symmetrical shielded motor cable, terminate the shield with a full 360-degree clamp at the drive, and keep control cables in a separate route. Install the recommended input fuses in the supply and check that the protective earth conductors are sized correctly.

With the assistant control panel, the start-up assistant leads the technician through motor data, application macro selection, reference source and ramps. Select the macro closest to the application, such as a pump or fan control or a simple three-wire start-stop, then adjust only what differs from the plant requirement. Run the motor uncoupled first to confirm the rotation direction, then couple the load and check current, speed and temperature under real operating conditions. Copy the final parameters to the panel memory as a backup.

Routine maintenance and common faults

• Overheating: clean the heat sink fins and check the cooling fan; blocked airflow is the usual cause on dusty sites.
• Undervoltage or supply-phase faults: check incoming fuses and terminal tightness, and look at the stability of the supply when large loads start.
• Overcurrent at start: verify the motor data, lengthen the acceleration ramp or reconsider heavy-duty sizing.
• Fieldbus communication loss: check the adapter seating, network cabling and termination before changing communication parameters.

Using the ACS550 in Oman and the wider GCC

Most of the drives that fail early in this region fail from heat and dust rather than from electrical overload. Pump houses, rooftop plant rooms and site containers in Oman can become very hot in summer, and a wall-mounted drive in such a space depends entirely on the surrounding air for cooling. Shade the installation from direct sun, keep the room ventilated or cooled, and allow for the drive’s heat dissipation when sizing that cooling.

Where airborne sand or dust is present, the IP54 version or a suitably rated cabinet is the safer choice, but sealed enclosures still need their filters and fans serviced on a fixed schedule. In coastal areas such as Muscat, Sur or Duqm, humid salty air can cause corrosion on terminals and condensation inside the housing when equipment cools at night. Keep cable entries sealed, inspect terminals during planned shutdowns, and avoid leaving drives de-energised for long periods in damp locations.

Documentation and ordering

The source is the ABB ACS550 catalog (3AFE64792857, rev. S), linked from this page, which holds the ratings, dimensions, fuses and option codes quoted above. Seven Star LLC supplies the ACS550-01-012A-4 on request from Muscat; send the motor nameplate, supply voltage, enclosure class and fieldbus need with your RFQ, and the quotation will state availability and lead time.

Confirm before ordering: the exact type code, the enclosure and panel options, and the motor current on your supply.