Emerson UNI4403 Control Techniques Unidrive AC Drive | Replacement, Equivalent & Selection Guide
The Emerson UNI4403 (Control Techniques Unidrive series) is a high-performance AC variable speed drive designed for demanding industrial motion control applications. Whether you are sourcing an original unit, evaluating a compatible replacement, or selecting an equivalent model, this guide provides the technical depth and cross-reference data you need.
Technical Specifications
- Manufacturer: Emerson / Control Techniques
- Series: Unidrive Classic
- Model Number: UNI4403
- Drive Type: AC Variable Speed Drive (VFD / Inverter)
- Output Power: 45 kW (60 HP) — 400 V class
- Input Voltage: 380–480 V AC, 3-phase, 50/60 Hz
- Output Voltage: 0–480 V AC, 3-phase
- Output Current: 96 A (Heavy Duty) / 105 A (Normal Duty)
- Control Mode: Open-loop V/Hz, Closed-loop Vector, Servo
- Enclosure Rating: IP20 (chassis mount)
- Communication: RS-485 (CT-Net); optional PROFIBUS, DeviceNet, CANopen
- Weight: Approx. 460 g (module only)
- Compliance: CE, UL, cUL
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as direct or functional replacements for the UNI4403. Always verify electrical ratings and control interface compatibility before substitution:
- Control Techniques Unidrive SP — SPMD4403: Next-generation successor with enhanced fieldbus support and onboard PLC. Direct functional equivalent.
- Control Techniques Commander SK — SKBD4400: Simplified replacement for basic V/Hz applications; reduced feature set.
- Emerson / Nidec Unidrive M — M700-04400360A: Current-generation platform; superior performance, requires parameter remapping.
- ABB ACS880-01-096A-3: Cross-brand equivalent at 45 kW / 400 V; different wiring and commissioning procedure.
- Siemens SINAMICS G120 — 6SL3224-0BE34-5UA0: Cross-brand alternative; modular design, requires CU240 control unit.
- Schneider Electric Altivar 71 — ATV71HD45N4: Functional equivalent for pump/fan and general-purpose loads.
Note: Cross-brand replacements require full parameter re-commissioning and may need wiring adaptation. Consult your system integrator.
Why Choose the Original UNI4403
- Proven reliability in continuous 24/7 industrial environments
- Native compatibility with existing CT-Net and legacy fieldbus networks
- No parameter remapping required — drop-in replacement for existing Unidrive Classic installations
- Full support for closed-loop vector and servo control modes
- Extensive installed base with well-documented commissioning procedures
- Genuine OEM parts available through authorized distributors including Konmask.com
Typical Applications
- Conveyor and material handling systems
- Pump and fan variable-speed control
- Compressor and HVAC drive applications
- Extruder and mixer drives in process industries
- Winding and unwinding tension control
- CNC spindle and servo axis control
System Compatibility
- PLC Integration: Compatible with Siemens S7, Allen-Bradley ControlLogix/CompactLogix, Mitsubishi MELSEC via optional fieldbus modules
- Fieldbus Options: PROFIBUS-DP, DeviceNet, CANopen, Modbus RTU (via SM modules)
- Motor Types: Induction (IM), Permanent Magnet (PM), Brushless Servo
- Braking: Internal braking transistor; external braking resistor required for high-inertia loads
- Encoder Feedback: Quadrature incremental encoder via optional SM-Encoder Plus module
Selection Guide
Use the following criteria to confirm the UNI4403 is the correct model for your application:
- Power Rating: Motor nameplate ≤ 45 kW / 60 HP at 400 V
- Load Type: Constant torque (Heavy Duty) or variable torque (Normal Duty / pump-fan)
- Control Requirement: Open-loop V/Hz → standard; closed-loop vector or servo → encoder module required
- Environment: IP20 chassis — install in a ventilated control cabinet; ambient temperature 0–40 °C
- Fieldbus: Confirm required protocol and order the corresponding SM option module
- Upgrade Path: If migrating to Unidrive M or SP series, request a parameter conversion file from your integrator
Quality Assurance & Sourcing
- All units supplied by Konmask.com are sourced from verified industrial channels
- Each unit undergoes visual inspection and functional verification prior to dispatch
- Original packaging, labels, and documentation preserved where available
- Traceability records maintained for B2B procurement compliance
- Warranty: 12 months from date of shipment (DOA replacement policy)
How to Order
- Part Number: UNI4403
- Add to cart directly on this page, or contact us for bulk/project pricing
- Lead Time: In-stock units ship within 1–3 business days; ex-stock orders confirmed within 24 hours
- Export: Available for international shipment; DDP/DAP Incoterms supported
- Documentation: Commercial invoice, packing list, and test report available on request
Replacement & Compatibility FAQ
Q: Is the UNI4403 still in production?
A: The Unidrive Classic series has been superseded by the Unidrive SP and Unidrive M platforms. The UNI4403 is available as a genuine spare/replacement unit through specialist distributors.
Q: Can I replace a UNI4403 with a Unidrive SP SPMD4403?
A: Yes, the SPMD4403 is the recommended successor. Parameters are not directly transferable; a full recommissioning is required. Consult the CT migration guide.
Q: What is the difference between UNI4401, UNI4402, and UNI4403?
A: These models differ in output current rating within the 400 V, 45 kW frame. UNI4403 is the standard Heavy Duty rating. Verify your motor FLA before substituting within the UNI44xx family.
Q: Does the UNI4403 support Modbus RTU?
A: Yes, via the SM-PROFIBUS or SM-Applications module with appropriate firmware. Native RS-485 CT-Net is standard.
Q: Can Konmask.com provide a test report?
A: Yes. A functional test report is available upon request for all units shipped from our facility.
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