ABB ACS350-03E-23A1-4 Micro Drive

(Full model number; suffix 4 = 380~480V three-phase)

Status: The ACS350 series is discontinued. No new production from ABB; only surplus stock and second-hand units are available as spare parts.

Product positioning: General-purpose OEM micro drive, widely used on machine tools, conveyors, fans and pumps for legacy equipment.

✅ Model Code Breakdown

ACS350: Product series, legacy general machinery drive

03: Three-phase input power supply

E: Built-in EMC filter (50Hz version)

23A1: Rated output current 23.1 A

4: Voltage class, 380~480V three-phase

✅ Key Technical Specifications

Rated power: 11 kW (15 HP)

Rated output current I2N: 23.1 A

Input supply: 3-phase 380–480 V, 48~63 Hz

Output: 0~input voltage, 0~500 Hz

Overload capacity: 150% I2N for 60 seconds per 10 minutes; 180% I2N for 2 seconds at startup

Frame size: R3

Protection class: IP20

Standard feature: Built-in braking chopper

Switching frequency: Default 4 kHz; selectable 4/8/12/16 kHz

Control modes: V/F scalar control, sensorless vector control for asynchronous motors; native Modbus RTU; optional fieldbus adapters

Keypad: ACS-CP-A / ACS-CP-C (interchangeable with ACS355)

Ambient conditions: No derating from -10℃ to +40℃; 10% power derating at 50℃; ≤1000 m altitude; 1% derating per 100 m above 1000 m.

✅ Direct Replacement Models (Field Retrofit Priority)

1. Pin-to-pin compatible replacement: ACS355-03E-23A1-4 (11 kW, 23.1 A, Frame R3)

Identical terminal layout, macros and keypad; direct swap for most installations with minor parameter adjustments. The ACS355 is also phased out with dwindling stock.

2. Long-term new-generation upgrade: ACS380-04S-026A-4 (11 kW, 26 A)

Similar IO logic; equipped with STO (Safe Torque Off); stable supply. Requires rechecking wiring, application macros and communication parameters.

✅ Spare Parts List

Keypad: ACS-CP-A (Assistant Panel, recommended) / ACS-CP-C (Basic Panel)

Braking resistor: Select according to deceleration duty; braking chopper is built-in, external resistor required

Fieldbus adapters: FDNA-01 (DeviceNet), FPBA-01 (Profibus DP), FENA-01 (Ethernet)

EMC note: E-type includes integrated EMC filter; U-type has no built-in filter.

✅ Typical Applications

Belt conveyors, packaging machinery, woodworking equipment, fans, water pumps, small machine tool spindles and general constant-torque loads.

✅ Common Fault Troubleshooting (ACS350 Series Common Issues)

1. Overcurrent: Motor short circuit, damaged power cable, mechanical jamming, too short acceleration time, failed IGBT module
2. Overvoltage: Excessively fast deceleration, missing or mismatched braking resistor, high mains voltage
3. Earth fault: Breakdown of motor insulation, leakage to ground on output cables
4. Modbus communication loss: Check terminating resistor, A/B polarity, station address and baud rate
5. No keypad display: 24V control supply failure, faulty control board or power board

✅ Supplementary Notes

Parameters cannot be copied directly between ACS350 and ACS355; parameter files must be re-uploaded/downloaded. Although the keypad is interchangeable, firmware and parameter groups differ. Always compare the original parameter list during replacement.

ABB ACS350-03E-23A1-4 (11 kW) Engineering Application Cases

Description: The ACS350 is a legacy OEM machinery drive with built-in EMC filter, integrated braking chopper, embedded sequence programming and native Modbus RTU, ideal for constant-torque loads. Below are the most common field applications for this power rating, including process description, control scheme, key parameters, risk points and retrofit notes.

Case 1: Main Belt Conveyor on Packaging Lines (Classic Constant-Torque Application)

Load: 11 kW conveyor motor for bulk material handling; smooth start/stop, anti-jam and speed synchronization between upstream/downstream sections required.

Control Scheme

Control mode: Sensorless vector control (99.04=1)

Speed reference: AI1 receives potentiometer/PLC analog signal; digital inputs select multi-speed preset (feed, normal speed, low-speed material clearing)

Interlock: Photoelectric jam signal from downstream fed into DI for automatic speed reduction; emergency stop wired to drive safety circuit

Braking: Built-in chopper + external braking resistor for fast stopping to prevent material pile-up

Key Parameter Settings

Acceleration: 8 s; Deceleration: 6 s; stall protection enabled

Application macro: Factory default macro; use embedded sequence programming to reduce PLC I/O count

Field Benefits: High low-speed torque without belt slip; lower mechanical shock and belt wear compared with star-delta starters. This is a widely used legacy application; preferred replacement part is ACS355-03E-23A1-4.

Risk: Regular dust cleaning required for dusty environments; overvoltage alarms occur if deceleration is too fast.

Case 2: Woodworking Machinery – Sanding Machine Feed Roller Drive

Load: Feed roller of sanding equipment; fluctuating load, stable low-speed torque without speed fluctuation to avoid sanding marks on workpieces.

Control Scheme

Vector control; DI run command; AI speed signal from main machine controller

Multi-speed selection for different workpiece thicknesses (low speed for thick boards, high speed for thin boards)

150% / 60 s overload protection to handle board jamming

Environmental Features: Cabinet-mounted IP20 unit for dusty woodworking workshops; built-in EMC filter on E-version prevents interference with proximity switches and encoders.

Limitation: No STO safety function. Upgrade to ACS380 for new machine retrofits.

Case 3: Screw Lifts / Bucket Elevators in Food Production Lines

Load: 11 kW vertical material handling with potential energy load; anti-rollback on shutdown.

Control Scheme

Standard built-in braking chopper with external resistor to prevent load coasting downhill

Digital terminal start/stop; 4–20 mA analog speed control; Modbus RTU communication with PLC host

Level interlock: Automatic speed reduction on low material level, auto-stop on full bin

Process Notes: Waterproof control cabinet for humid conditions; strict earthing and high motor insulation resistance required.

Remark: The ACS350 was ABB’s flagship OEM drive for bakery, extrusion and feed processing lines.

Case 4: Extruder Auxiliary Traction Drive (Plastics Industry)

Load: Traction roller on plastic extrusion lines; constant torque with speed proportional synchronization with main extruder.

Control Scheme

Option 1: AI speed follow signal from main drive (proportional speed regulation)

Option 2: Modbus RTU bus synchronization with master drive

Vector control maintains stable tension at low speed to avoid breakage or material accumulation

Embedded sequence programming for start delay and stop sequence to simplify PLC logic

Comparison: Main extruders typically use ACS510/ACS550 while ACS350 serves as a cost-effective auxiliary drive. Re-synchronization logic is required when retrofitting to ACS380.

Case 5: HVAC & Water Treatment Circulation Pumps (Variable Torque, PID Closed Loop)

Load: 11 kW cooling water circulation pump or constant-pressure water supply pump.

Control Scheme

Control mode: V/F scalar control; built-in PID macro; 4–20 mA pressure transmitter feedback to AI2

Goal: Maintain constant pipe pressure with variable speed energy saving

One-duty-one-standby rotation must be implemented via external PLC; the ACS350 does NOT support built-in PFC pump cycling function (difference from ACS510)

Energy Saving: 20%~40% power reduction under partial load compared with direct-on-line operation.

Case 6: Small CNC Machine Tools – Spindle Cooling & Conveyor Drives

Load: Machine tool feed rollers, cooling fans and chip conveyors with 11 kW rating.

Control Scheme

Keypad/terminal control with multi-speed preset linked to CNC M-codes; FPBA-01 Profibus DP adapter for CNC system networking

EMC compliance guaranteed by integrated EMC filter on E-version

Limitation: Only for asynchronous motors; not compatible with permanent magnet synchronous motors. No longer specified for new machine builds.

Case 7: Roller Feeders for Sand & Building Material Auxiliary Lines

Load: Roller feeders and apron feeders with frequent start-stop and shock loading.

Control Scheme

Vector control to boost starting torque; stall protection triggers alarm on material jamming

Modbus RTU remote control via central PLC; real-time current and fault code monitoring

Environment: Installed in standalone ventilated cabinets for heavy dust conditions; regularly test output cable insulation to prevent earth faults.

General Commissioning & Retrofit Summary (ACS350-03E-23A1-4)

1. Constant-torque loads (conveyors, woodworking, traction, elevators): Use sensorless vector control and take full advantage of the built-in braking chopper.
2. Variable-torque loads (fans & pumps): Use V/F scalar control + built-in PID. Note that PFC pump rotation is not supported on ACS350 and requires external PLC logic.
3. Communication: Native Modbus RTU; optional extensions: Profibus DP (FPBA-01), DeviceNet (FDNA-01).
4. Spare Part Replacement

Direct like-for-like swap: ACS355-03E-23A1-4 (identical terminals & keypad; no direct program copy due to parameter group differences)

Long-term upgrade: ACS380-04S-026A-4 (STO equipped; IO and communication logic must be re-engineered)

5. Shortcomings: No STO safety torque-off function; fully discontinued with only surplus and second-hand stock available.
6. Model Prefix Code Definition

01: Single-phase input 200–240 V

03: Three-phase input

E: Built-in EMC filter (this model = 03E); U: No built-in filter; X: Placeholder for E/U in selection codes

Suffix 2 = 200–240 V; suffix 4 = 380–480 V (this model suffix = 4)

Power range: 0.37 kW ~ 22 kW, frame sizes R0/R1/R2/R3/R4

1. Three-phase 380–480 V (03E-xxx-4 Series, Primary Model Range)

ACS350-03E-XXAXX-4 (with built-in EMC filter)

Filter-free version: Replace 03E with 03U; power and current ratings remain identical.

III. Three-phase 200–240 V (03E-xxx-2)

1. Single-phase 200–240 V (01E-xxx-2, Single-phase Supply)

Filter-free version: Change 01E to 01U.

1. Cross-Model Replacement List (Spare Part Retrofit)
2. Direct pin-compatible replacement: ACS355-03E-23A1-4 (11 kW, 23.1 A, R3)

Same terminal layout and keypad; minor parameter tuning only. The ACS355 is also discontinued with limited stock.

2. New-generation long-term upgrade: ACS380-04S-026A-4 (11 kW, 26 A)

Equipped with STO Safe Torque Off; stable supply; requires rework on wiring, macros and communication settings.

1. Supplementary Remarks
2. All models: IP20 protection, built-in braking chopper, native Modbus RTU included as standard.
3. Code definitions: E = Built-in EMC Filter; U = No EMC Filter; X = E/U selection placeholder.
4. The entire ACS350 series is officially end-of-life; only surplus stock and second-hand spare parts are available.
5. Original ABB order codes can be retrieved upon model number request.