ABB ACS550-01-125A-4 ACS550 Variable Frequency Drive

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Manufacturer: ABB
Product No.: ACS550-01-125A-4
Country of origin:Sweden
Product Type: Variable Frequency Drives
Barcode: 85044095
Payment: T/T, Western Union
Weight: 34000g
Dimensions: 265 mm (W) x 739 mm (H) x 286 mm (D)
Shipping port: Xiamen
Warranty: 12 months

Description

Operating within three-phase industrial power grids, the ABB ACS550-01-125A-4 variable frequency drive provides speed and torque regulation for three-phase induction motors. Engineered for normal-duty applications up to 55 kW (100 HP), this drive combines vector control, scalar control, and a built-in harmonic mitigation swing choke to optimize mechanical performance and energy efficiency. The unit is housed in a robust IP21 (UL Type 1) enclosure, making it suitable for standard side-by-side cabinet mounting or direct wall integration within clean, dry industrial environments.

Features

Advanced Vector Control: Supports both open-loop vector and scalar control modes to adapt to varying torque demand profiles.
Harmonic Reduction: Features a patented variable inductance swing choke to suppress raw harmonics at both partial and full motor loads.
Integrated EMC Filter: Built-in RFI/EMC filter compliant with EN 61800-3 standards for minimal electromagnetic interference.
Flexible Communication Protocols: Standard Modbus RTU communication integrated on-board via RS-485 interfaces.
Assistant Control Panel: Multilingual alphanumeric control panel featuring guided start-up assistants, real-time diagnostic readouts, and parameter backup functions.

Applications

Centrifugal Pumps: Variable flow control for water supply, booster stations, and waste-water processing plants.
Industrial Fans: Power-efficient airflow regulation in ventilation systems, cooling towers, and dust collectors.
Conveyor Systems: Soft-start ramp profiles and speed synchronization for production lines and bulk material handling.
Air Compressors: Constant pressure maintenance through continuous motor speed modulation.

Technical Specifications

Parameter	Value / Specification
Manufacturer	ABB
Model Number	ACS550-01-125A-4
Input Voltage Range	380 - 480 V AC (3-Phase)
Input Frequency Range	48 to 63 Hz
Output Power (Normal Use)	55 kW / 100 HP
Output Current (Normal Use)	125 A
Enclosure Rating	IP21 (UL Type 1)
Frame Size	R4
Operating Temperature Range	-15 to 40 degC (No derating) / up to 50 degC (With derating)
Shipping Weight (Calculated)	34.00 kg
Package Dimensions (Calculated)	265 mm (W) x 739 mm (H) x 286 mm (D)
Commodity Code	85044095

Connections and Interfaces

Terminal / Port	Function / Signal Assignment
U1, V1, W1	Three-phase AC line input supply terminals
U2, V2, W2	Three-phase motor connection output terminals
UC+, UC-	DC bus connection (for dynamic brake chopper modules)
X1: AI1 / AI2	Programmable analog inputs (Voltage 0-10V, Current 0/4-20mA)
X1: DI1 to DI6	Programmable digital inputs (PNP/NPN, 24V DC auxiliary power)
X1: RO1, RO2, RO3	Programmable form-C relay outputs (250V AC / 30V DC, max 2A)

Empirical Engineering Insights

Alternative Models & Compatibility

The ACS550-01-125A-4 is part of the mature ACS550 line. For modern migration tracks or new infrastructure planning, the ABB ACS580-01-124A-4 serves as the direct hardware replacement. Note that when migrating to the ACS580 series, control panel templates and serial parameter sets must be updated since parameter indexes and software profiles differ between the older ACS550 firmware and newer Drive-to-Drive platforms.

Application Pitfalls & Engineering Notes

To prevent thermal accumulation, ensure a minimum clearance of 200 mm above and below the R4 frame size when mounting inside electrical enclosures. Driving high-inertia loads like heavy ventilation fans or industrial centrifuges without a braking resistor can trigger overvoltage trips (Fault 2 - DC OVERVOLT) during rapid deceleration ramps. To mitigate this issue, configure the drive parameter to utilize the "deceleration-limit" function or integrate an external dynamic braking chopper unit.

Commissioning & Wiring Tips

Always configure the correct Application Macro (e.g., HVAC, 3-wire, or PID control) during initial start-up, as changing the macro later will restore default values and overwrite customized digital input routing. To suppress high-frequency electrical noise, use symmetrical shielded motor cabling and ground the shield 360 degrees at both the VFD PE terminal plate and the motor terminal box.

Installation Guidelines

CRITICAL WARNING: ELECTRICAL HAZARD

Prior to commencing installation or maintenance, isolate all incoming power lines. Wait at least 5 minutes after disconnecting the power supply to allow the internal DC bus capacitors to fully discharge. Always verify the absence of voltage on terminals U1/V1/W1, U2/V2/W2, and UC+/UC- with a certified multimeter before handling connection terminals.

Mount the R4 frame drive vertically on a flat, non-flammable wall or backplate inside an IP54 or equivalent enclosure if installed in dusty environments.

Connect the input line supply lines to U1, V1, and W1, and the motor power lines to U2, V2, and W2. Ensure correct terminal torque values according to Frame R4 manual requirements.

Route the low-voltage control signal cables (AI, DI, Relay) through separate metal conduits to prevent cross-talk and high-frequency electrical coupling with the motor cables.

Perform ground continuity tests on both the motor chassis and the VFD housing to ensure a low-impedance connection to the main facility earth grid.

Key Features:

#ACS550 Series #Variable Frequency Drives

What is the direct modern replacement for the ACS550-01-125A-4 drive?

The recommended modern migration pathway is the ABB ACS580-01-124A-4 drive. Note that while power ratings are similar, physical dimension layouts and control parameter structures vary between these series.

How do I clear a persistent 'DC OVERVOLT' fault on deceleration?

A DC overvoltage fault typically indicates regenerative energy from the motor. Extend the deceleration ramp time (Parameter 2203) or install a compatible dynamic braking chopper with braking resistors.

Can this drive be operated on single-phase supply lines?

No. The ACS550-01-125A-4 is designed exclusively for balanced three-phase 380-480 V AC inputs. Running on single-phase input will trigger phase-loss protection faults and damage internal rectifiers.

What standard enclosure class does the ACS550-01-125A-4 have?

This unit features an IP21 (UL Type 1) enclosure rating, protecting against solid objects larger than 12 mm and vertical water condensation. It is meant for indoor installations.

Global Express Shipping

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Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin

ABB ACS550-01-125A-4 ACS550 Variable Frequency Drive