ABB ACS550-01-087A-4 AC Drive 45 kW 87 A

Frame R4 ACS550 drive rated 87 A

Rating 45 kW, 87 A, frame R4: those three facts identify the ACS550-01-087A-4 in ABB’s ACS550-01 table, with 72 A available for 37 kW heavy-duty loads. The base measures 203 x 262 mm. At 45 kW on frame R4 this is the largest of the six ACS550-01 types in this group, aimed at large pump stations, fan banks and compressors.

Commissioning is helped by the assistant control panel, which has a built-in help function, a real-time clock and a parameter copy function. The family also has an on-board Modbus EIA-485 interface. See AC drives for neighbouring ratings and the ABB ACS550 overview for the series.

Technical specifications

Selection notes for 45 kW on frame R4

For a pump or fan, check that the motor current does not exceed 87 A. For a mixer or crusher with frequent overloads, check it against 72 A instead; that class is rated for about 108.0 A during a one-minute overload. These ratings apply at ambient temperatures up to 40 degrees C, with derating up to 50 degrees C.

Fuse: 125 A gG or 125 A Class T. Cooling: 280 m3/h (165 ft3/min) of air, losses of 1440 W (4918 BTU/hr), with free space of 200 mm above and below. Motor cable: 300 m as standard, 300 m with output choke NOCH-0070-6X, whose thermal current is 112 A.

Decoding ACS550-01-087A-4 and adding options

Reading ACS550-01-087A-4: ACS550 names the series, 01 means wall-mounted (02 is free-standing), 087A is the rating and 4 selects 380 to 480 V. The catalogue appends plus codes, for example +B055 for IP54 / UL Type 12, +J404 for the ACS-CP-C basic panel, +0J400 for no panel, +L511 for OREL-01 relay outputs and +K454 for RPBA-01 PROFIBUS DP.

Frame R4 dimensions printed in the catalogue are: IP21, 689 / 596 mm (with / without connection box) x 203 x 262 mm, 24 kg; IP54, 760 x 257 x 284 mm, 26 kg. Remember that UL Type 12 and IP54 apply only to the option-coded variant.

Installing a wall-mounted R4 drive

The ACS550-01 is designed for wall mounting, so choose a vertical, solid and non-flammable surface that can carry the weight of the drive and its cabling. Mount it upright and respect the free space above and below so that the cooling air stated in the catalogue can pass through the heatsink without being recirculated. When several drives or other heat sources are fitted near each other, avoid stacking them so that one drive draws in the hot exhaust air of another. If the drive is placed inside a larger enclosure, the cabinet ventilation must remove the heat losses listed in the table above.

Wire the supply through the recommended fuses, use a properly sized protective earth, and run symmetrical screened motor cable with the screen bonded at the drive and at the motor. Keep control cables, fieldbus cables and the Modbus link separate from motor and supply cables, and cross them at right angles where they must meet. Check the insulation of the motor and its cable before connecting them to the drive, particularly when a motor that has run direct-on-line for years is being converted to variable speed operation.

Commissioning with the assistant panel

The assistant control panel guides the user through the start-up questions: enter the motor nameplate values, choose the application macro that is closest to the process, and set acceleration, deceleration and speed limits. Test the start, stop and safety interlocks with the motor uncoupled if the machine allows it, then confirm the direction of rotation and observe the motor current under real load. The parameter copy function of the panel is useful for saving the finished settings and loading them into a spare drive.

Operating conditions in Oman and the GCC

Pump stations, cooling towers and ventilation plants in Oman often sit in rooms or kiosks that become very hot in summer. Since the catalogue ratings apply only up to the stated ambient temperature and altitude, plan the cooling of the drive room or panel before selecting the rating, and apply the derating rules whenever the room may run hotter. Fine dust and sand clog heatsink fins and fan inlets, which raises internal temperature over time. For dusty plant rooms or areas exposed to washdown, the IP54 variant described above is the enclosure to consider; in standard IP21 form the drive should sit in a clean, sheltered location or inside a ventilated enclosure with filters.

Maintenance during planned stops

Clean the heatsink and fan with dry compressed air, check that the cooling fan turns freely and quietly, retighten power terminals where the manufacturer instructions recommend it, and review the fault and event logs for recurring overcurrent or overtemperature trips. Recording these checks for each drive helps to plan fan replacement and keeps critical pumps and fans in service.

Documents and RFQ

Figures here come from ABB’s ACS550 catalog 3AFE64792857, available through the document link. To obtain a price for the ACS550-01-087A-4, send Seven Star LLC your motor data, voltage and communication needs; availability and lead time are confirmed in the quotation.

Before ordering, verify the full type code with options, the motor current, and the site temperature and altitude, since catalogue ratings apply at up to 40 degrees C and 1000 m.