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- SP4401
- AC Drive
- USA
- 510 × 298 × 310 mm
- 4 kg
- Xiamen, China
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Product Overview
The Emerson SP4401 is an AC drive in the Unidrive SP series, used to regulate motor speed and torque in industrial machinery. It is suited to applications where motor output must respond to changing production demand, load conditions or machine-control commands. Typical installations include conveyors, extrusion equipment, winding systems, pumps and other process machinery driven by three-phase AC motors.
The SP4401 operates from a three-phase 380–480 V AC supply. Its rated output is 37 kW in Normal Duty operation and 30 kW in Heavy Duty operation, with corresponding output-current ratings of 68 A and 60 A. These duty classifications help determine whether the drive is suitable for a particular motor load, especially in applications involving frequent acceleration, changing torque demand or sustained operation.
The drive supports several motor-control strategies, including open-loop vector control, V/Hz control and compatible closed-loop operation. Built-in serial communication, configurable control interfaces, onboard PLC functionality and expansion options allow it to exchange operating commands with a machine controller and accommodate additional feedback or communication requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / Control Techniques |
| Model | SP4401 |
| Product Series | Unidrive SP |
| Product Type | AC Variable Frequency & Servo Drive |
| Drive Configuration | Panel-Mount AC Drive |
| Input Voltage | 380–480 V AC |
| Input Phase | Three-phase |
| Input Frequency | 48–65 Hz |
| Normal Duty Output Power | 37 kW |
| Heavy Duty Output Power | 30 kW |
| Normal Duty Output Current | 68 A |
| Heavy Duty Output Current | 60 A |
| Control Modes | V/Hz, open-loop vector, rotor flux control and supported closed-loop control modes |
| Built-in Communication | RS-485 |
| Serial Communication Protocol | Modbus RTU |
| Control Interfaces | Configurable analog and digital I/O |
| Expansion Capability | Compatible option modules |
| Programmable Logic | Onboard drive PLC functionality |
| Parameter Storage | Smartcard support |
| Enclosure Protection | IP20 |
| Cooling Method | Forced-air cooling |
| Dimensions | 510 × 298 × 310 mm |
| Weight | 4 kg |
Product Features
- Industrial motor regulation: Controls motor speed and torque according to the selected control mode and application requirements.
- Separate duty ratings: Provides different power and current ratings for Normal Duty and Heavy Duty operation.
- Multiple control strategies: Supports open-loop control and compatible feedback-based configurations.
- Built-in serial communication: RS-485 supports communication with compatible automation equipment.
- Configurable control I/O: Supports external run commands, reference signals and operating-status monitoring.
- Expansion options: Compatible modules can add communication, feedback and additional signal-handling functions.
- Onboard drive PLC: Supports drive-related logic and local sequencing tasks.
- Smartcard functionality: Allows compatible parameters and programs to be stored and transferred.
- Drive diagnostics: Operating-status information and fault indications assist commissioning and maintenance.
Working Principle
The SP4401 converts incoming three-phase AC power into a controlled electrical output for the connected motor. It adjusts output voltage and frequency according to the selected control strategy, motor parameters and requested operating conditions.
In an industrial conveyor system, for example, a PLC can send a speed reference to the SP4401 according to production demand. The drive regulates the motor to maintain the required conveyor speed and follows the configured acceleration and deceleration ramps when operating conditions change. Available status and fault signals can be used by the controller to coordinate the conveyor with upstream and downstream machinery.
Open-loop control can be used where encoder feedback is unnecessary. Applications requiring feedback-based speed or torque regulation need a compatible feedback arrangement and the appropriate drive configuration. The onboard PLC can handle supported local drive logic, while serial communication and optional modules extend the drive’s integration with the machine-control system.
During commissioning, motor nameplate data, duty classification, current limits, speed references and ramp settings must be matched to the actual application. The selected control method should also reflect the motor type, load characteristics and required operating performance.
Role in a Unidrive SP Motor-Control Architecture
The SP4401 occupies the motor-control stage between the incoming electrical supply and the driven machine. It receives operating commands from a PLC or another configured control source and regulates motor output according to the application’s requirements.
Three-Phase AC Supply → SP4401 AC Drive → AC Motor → Industrial Machinery
| System Component | Function | Relationship to the SP4401 |
|---|---|---|
| SP4401 AC Drive | Regulates motor speed and torque | Controls the electrical output supplied to the motor |
| Three-Phase AC Supply | Supplies electrical power | Feeds the drive input |
| AC Motor | Converts electrical energy into mechanical motion | Drives the connected machinery |
| PLC or Machine Controller | Executes machine sequencing and interlocks | Sends run commands and speed references |
| Encoder or Feedback Device | Measures speed or position where required | Supports compatible closed-loop configurations |
| RS-485 Communication Interface | Exchanges serial data | Connects the drive to compatible control equipment |
| Analog Reference Source | Supplies a configured speed or process reference | Provides an input for motor regulation |
| Digital Control Signals | Carry enable, run, stop and status signals | Support external control and monitoring |
| Braking Resistor | Dissipates braking energy where required | Supports applications with demanding deceleration requirements |
| Communication Option Module | Adds supported network connectivity | Extends the available communication interfaces |
| Feedback or I/O Option Module | Adds compatible feedback or signal-handling functions | Adapts the drive to application requirements |
| Electrical Protection Devices | Provide electrical protection and isolation | Form part of the surrounding motor installation |
Industrial Applications
| Application | Typical Equipment | Role of the SP4401 |
|---|---|---|
| Conveyor Systems | Production conveyors and material-transfer lines | Regulates motor speed to coordinate material movement |
| Extrusion Machinery | Plastic extrusion and material-processing lines | Controls motor operation during continuous production |
| Winding Equipment | Web handling and winding machines | Supports speed regulation and compatible feedback control |
| Pumping Systems | Industrial process and utility pumps | Adjusts motor speed according to process demand |
| Industrial Fans | Ventilation and process-air equipment | Regulates airflow through variable-speed operation |
| Packaging Machinery | Automated packaging and conveying systems | Coordinates motor operation with production sequences |
| Printing Machinery | Printing presses and web-handling equipment | Regulates motor speed during production |
| Material Handling | Industrial transfer and movement equipment | Controls motor operation according to the required movement profile |
| Cutting and Processing Machinery | Industrial cutting and processing equipment | Regulates motor speed during machine cycles |
| General Manufacturing | Machines with variable-speed AC motors | Provides adjustable motor control for production operations |
Installation and Maintenance
- Verify the drive identification: Confirm the SP4401 model and electrical ratings before installation.
- Check the supply requirements: Verify that the three-phase supply is compatible with the specified 380–480 V AC input range.
- Inspect the installation location: Ensure the panel arrangement provides the required ventilation, clearance and environmental protection.
- Select suitable electrical protection: Check protective devices, conductors, isolation arrangements and earthing against the installation requirements.
- Isolate power before wiring: Disconnect the supply and follow the specified discharge and safe-working procedures before handling drive terminals.
- Verify motor connections: Check the motor nameplate data, cable connections, earthing and output-terminal wiring before energizing the drive.
- Configure motor parameters: Enter the applicable motor data and select the control mode required by the application.
- Check feedback and option modules: Verify installed communication modules, feedback devices and additional I/O where applicable.
- Set operating references: Configure run commands, speed references, acceleration and deceleration ramps, and operating limits.
- Test communication and I/O: Confirm that controller commands, status signals and configured communication functions operate as expected.
- Perform a controlled commissioning test: Check motor direction, speed response, stopping behavior and fault handling before returning the machine to production.
- Record the configuration: Document parameter settings, installed options, commissioning results and maintenance history for future servicing.
Related Components
| Component | Function | Relationship to the SP4401 |
|---|---|---|
| Unidrive SP Keypad | Provides local parameter access and operating-status information | Supports local setup and monitoring when fitted |
| Smartcard | Stores compatible parameters and programs | Supports configuration backup and transfer |
| Encoder Feedback Module | Interfaces with compatible motor feedback devices | Enables supported closed-loop configurations |
| Communication Option Module | Adds supported industrial network interfaces | Connects the drive to compatible automation systems |
| I/O Option Module | Adds compatible input and output functions | Extends signal-handling capabilities |
| Braking Resistor | Dissipates braking energy where required | Supports demanding deceleration applications |
| AC Motor | Converts electrical power into mechanical motion | Serves as the controlled load |
| PLC | Coordinates machine logic and interlocks | Sends commands and receives drive-status information |
| Electrical Isolation Device | Provides isolation for servicing | Supports safe maintenance procedures |
| Motor Protection Devices | Provide protection for the motor circuit | Complement the wider electrical installation |
Recommended Related Models
| Model / Product | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Emerson SP4401 | Unidrive SP AC Drive | Main product | Match the 380–480 V supply and required duty rating |
| Emerson SP4402 | Unidrive SP AC Drive | Related model in the same frame family | Compare output-current requirements and load characteristics |
| Emerson SP4403 | Unidrive SP AC Drive | Related model in the same frame family | Evaluate motor power and overload requirements |
| Emerson SP3403 | Unidrive SP AC Drive | Related model in a smaller frame family | Consider whether its output ratings meet the application’s requirements |
| Unidrive SP Feedback Option Modules | Drive Feedback Modules | Related configuration components | Select according to the required encoder or feedback interface |
| Unidrive SP Communication Option Modules | Drive Communication Modules | Related configuration components | Match the required industrial network and protocol |
| Unidrive SP Braking Components | Drive Braking Accessories | Related application components | Evaluate the load’s braking and stopping requirements |
Key Advantages
- Supports multiple motor-control strategies for industrial AC applications.
- Provides separate Normal Duty and Heavy Duty ratings.
- Includes built-in RS-485 serial communication.
- Supports compatible feedback, communication and I/O expansion modules.
- Includes onboard PLC functionality for supported drive-related logic.
- Supports storage and transfer of compatible drive configurations.
- Integrates with PLC-based machine-control systems.
Technical FAQs
What are the Normal Duty and Heavy Duty ratings of the SP4401?
The SP4401 has a Normal Duty rating of 37 kW and 68 A, and a Heavy Duty rating of 30 kW and 60 A. The appropriate rating depends on motor current, load characteristics and the application’s overload requirements.
Can the SP4401 operate without encoder feedback?
Yes. Open-loop control modes do not require encoder feedback. Closed-loop operation requires a compatible feedback device and the appropriate drive configuration.
What role does the onboard PLC serve in the SP4401?
The onboard drive PLC supports compatible local logic and sequencing tasks. Its suitability depends on the complexity of the application and the functions required from the main machine controller.
What should be checked when commissioning the SP4401?
Verify the motor data, duty classification, control mode, speed references, ramp settings, feedback configuration and external interlocks. Test motor direction, speed response, stopping behavior and fault handling before normal production begins.