ABB ACS550-01-031A-4 AC Drive 15 kW 31 A

ACS550-01-031A-4 in brief

Frame R3 starts here at 15 kW, a common rating for medium pumps, compressors and fans on utility plant. The ABB part that matches is the ACS550-01-031A-4: 3-phase, 380 to 480 V, 31 A normal-use current (15 kW / 20 hp), frame R3, with a heavy-duty option of 23 A.

Highlights printed in the catalogue include vector control, coated boards for harsh environments, FlashDrop for parameter setting without mains power, and the assistant control panel supplied as standard. See the AC drives category or the ABB ACS550 series page for sister ratings.

Technical specifications

Overload, choke and cooling data for the ACS550-01-031A-4

The catalogue separates two duty classes. In normal use the drive supplies 31 A continuously with a 10% overload for one minute in ten. In heavy-duty use it supplies 23 A with a 50% overload, about 34.5 A, for one minute in ten, and always 1.8 times I2hd for 2 seconds every 60 seconds. For most pump, fan and conveyor work the normal-use figure applies.

Catalogue values for installation: fuses 35 A gG or 40 A UL Class T; losses 457 W; air 134 m3/h; cable 200 m without and 250 m with NOCH-0030-6X. The output choke does not improve EMC performance, so use suitable RFI filtering where local EMC rules require it.

Decoding ACS550-01-031A-4 and adding options

Decode the code as follows: ACS550 is the series, 01 the wall-mounted construction, 031A the rating field and 4 the 380 to 480 V range (2 would mean 208 to 240 V). A four-character option code replaces B055 where needed: B055 is IP54, J404 the basic control panel (ACS-CP-C), 0J400 no control panel, L511 the OREL-01 relay output extension and K454 the RPBA-01 PROFIBUS DP adapter.

Frame R3 dimensions printed in the catalogue are: IP21, 583 / 490 mm (with / without connection box) x 203 x 231 mm, 16 kg; IP54, 629 x 257 x 254 mm, 17 kg. Remember that UL Type 12 and IP54 apply only to the option-coded variant.

Installation checks for a wall-mounted R3 drive

The ACS550-01-031A-4 is a wall-mounted unit, so the mounting surface must be flat, non-combustible and able to carry the drive weight given in the table. Mount it vertically with the cooling air path unobstructed, and leave the free space above and below that the ABB installation instructions require. When several drives are placed in one room or cabinet, make sure the hot exhaust of one unit is not drawn into the inlet of the next one. The heat dissipation and cooling air flow figures listed above are the basis for sizing room ventilation or panel cooling.

On the supply side, use the recommended fuses and a cable sized for the input current under local wiring rules. On the motor side, use a symmetrical screened motor cable, bond the screen at both ends with 360-degree glands, and keep the motor cable length within the catalogue limits with or without the output choke. Run control cables in separate trays from motor cables, and cross them at right angles where they must meet.

Commissioning with the assistant control panel

The assistant control panel supplied as standard guides the user through the start-up sequence. Enter the motor nameplate data accurately, especially nominal current, voltage, frequency and speed, because overload protection and vector control rely on these values. Select the duty that matches the load, normal use for pumps and fans or heavy-duty for loads that need the higher short-term overload, and set acceleration and deceleration ramps that the mechanical system can tolerate. Since this rating has no built-in brake chopper, avoid very short deceleration times on high-inertia fans unless an external braking arrangement is provided.

FlashDrop is useful where several identical drives are installed: a tested parameter set can be copied to each drive without connecting mains power, which reduces setting errors on site.

Routine maintenance

Most drive problems in service come from heat and contamination. Inspect the heatsink and cooling fan at planned intervals, clean dust from air paths with the drive isolated and discharged, and check that cable terminations remain tight. Record the fault history from the control panel before resetting a trip, as it helps to find whether the cause is the supply, the motor or the load. Keep a copy of the parameter set so that a replacement unit can be configured quickly.

Operating in Omani plant rooms

Pump stations, cooling towers and utility buildings in Oman often face high summer ambient temperatures, fine sand and, near the coast, humid salty air. The coated boards mentioned in the catalogue help against harsh air, but the enclosure choice still matters: the IP54 version is the safer option where dust or moisture reaches the drive, while an IP21 unit is better placed inside a clean, ventilated electrical room. In both cases, check the ambient temperature at the drive location against the ABB derating rules before final selection.

Source document and quotation

ABB document 3AFE64792857 is the reference for every rating on this page and can be opened from the document link. Seven Star LLC supplies the ACS550-01-031A-4 to project and maintenance buyers on request, with availability and lead time stated in the quotation.

Check the type code, options, motor current and ambient conditions against your own documents before ordering.