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- SP3402
- AC Drive
- USA
- 368 × 250 × 260 mm
- 3.5 kg
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Product Overview
The Emerson SP3402 is a high-performance variable-speed drive in the Unidrive SP series from Control Techniques. It is used to regulate AC motor speed and torque in industrial machinery, supporting applications that require adjustable operating speeds, controlled acceleration and deceleration, and integration with machine automation systems.
The SP3402 operates from a three-phase 380–480 V AC supply. It is rated for 18.5 kW in Heavy Duty operation and 22 kW in Normal Duty operation, with corresponding output current ratings of 40 A and 43 A. These ratings make it suitable for a range of industrial motor-control tasks, including conveyor systems, pumps, fans and material-processing equipment.
The drive supports multiple control modes, including open-loop V/Hz, open-loop vector, rotor flux control, closed-loop vector and compatible servo operation. Built-in RS-485 communication, configurable I/O, three option-module slots and an integrated drive PLC function allow the SP3402 to be adapted to different machine-control architectures. Its Smartcard functionality also supports the storage and transfer of compatible drive parameters and programs.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / Control Techniques |
| Model | SP3402 |
| Product Series | Unidrive SP |
| Product Type | Universal AC and Servo Drive |
| Drive Configuration | Panel-Mount Variable-Speed Drive |
| Input Voltage | 380–480 V AC |
| Input Phase | Three-phase |
| Input Frequency | 48–65 Hz |
| Heavy Duty Output Power | 18.5 kW |
| Normal Duty Output Power | 22 kW |
| Heavy Duty Output Current | 40 A |
| Normal Duty Output Current | 43 A |
| Typical Motor Rating | 25 HP Heavy Duty / 30 HP Normal Duty |
| Control Modes | Open-loop V/Hz, open-loop vector, rotor flux control, closed-loop vector and compatible servo control |
| Serial Communication | Built-in RS-485, Modbus RTU |
| Analog Inputs | 3 |
| Analog Outputs | 2 |
| Digital Inputs | 7 |
| Digital Outputs | 3 |
| Relay Outputs | 1 |
| Expansion Slots | 3 option-module slots |
| Programmable Logic | Built-in drive PLC function |
| Enclosure Protection | IP20 |
| Cooling Method | Forced convection |
| Dimensions | 368 × 250 × 260 mm |
| Weight | 3.5 kg |
Product Features
- Flexible motor-control modes: Supports multiple control strategies for induction motors and compatible servo applications, depending on the selected configuration.
- Three-phase AC input: Operates from a 380–480 V AC supply for industrial motor-drive installations.
- Dual duty ratings: Provides separate Normal Duty and Heavy Duty output ratings to accommodate different load requirements.
- Configurable I/O: Supports run commands, speed references, status signals and other configured machine-control functions.
- Built-in RS-485 communication: Enables serial integration with compatible PLCs and supervisory systems using supported protocols.
- Option-module expansion: Three option slots support compatible communication, feedback, I/O and automation modules.
- Integrated PLC functionality: Handles supported drive-related logic and sequencing tasks within the configured application.
- Smartcard parameter storage: Supports backup and transfer of compatible drive settings and programs.
- Dynamic braking support: Supports controlled deceleration when the application and braking arrangement require it.
- Drive monitoring and protection: Monitors operating conditions and provides fault indications to assist commissioning and maintenance.
Working Principle
The SP3402 converts incoming three-phase AC power into a controlled electrical output for the connected motor. Its power electronics regulate output voltage and frequency according to the selected control mode, motor parameters and requested operating speed.
In open-loop V/Hz or vector operation, the drive adjusts the motor output according to the selected control strategy. Closed-loop vector operation uses compatible feedback equipment where required to improve speed and torque regulation. Servo applications require a suitable motor, feedback arrangement and configuration.
For example, on a material-handling line, a PLC can send a run command and speed reference to the SP3402. The drive accelerates the motor according to the configured ramp, maintains the requested operating speed and responds to stop commands or fault conditions. Status signals and communication data can be returned to the controller so that the wider automation system can coordinate the equipment.
The integrated PLC function supports local drive-related logic, while optional modules can add communication or feedback capabilities. Actual performance depends on motor characteristics, drive settings, feedback devices, switching frequency and the application load.
Role in a Unidrive SP Motor-Control Architecture
The SP3402 serves as the motor-power conversion and speed-control component in an industrial automation system. It receives operating commands and references from a controller or configured local logic, then regulates the electrical output supplied to the motor.
| System Component | Function | Relationship to the SP3402 |
|---|---|---|
| SP3402 AC Drive | Regulates motor voltage, frequency and operating behavior | Controls the connected motor |
| Three-Phase AC Supply | Supplies electrical power | Provides the drive input |
| Induction Motor | Converts electrical energy into mechanical motion | Receives the controlled drive output |
| PLC or Machine Controller | Executes machine sequencing and interlocks | Sends commands and speed references |
| Encoder or Feedback Device | Measures motor speed or position where required | Supplies feedback for supported closed-loop configurations |
| RS-485 Communication Network | Exchanges serial data | Connects the drive to compatible control equipment |
| Analog Reference Source | Provides a configured speed or process reference | Supplies a reference for drive regulation |
| Digital Control Signals | Carry run, stop, enable and other configured commands | Control drive operation |
| Braking Resistor | Dissipates braking energy where required | Supports applications requiring additional braking capability |
| Option Module | Adds supported communication, feedback, I/O or automation functions | Extends the drive configuration |
| Motor Protection and Isolation Devices | Support electrical protection and safe isolation | Form part of the surrounding installation |
The actual architecture depends on the motor type, selected control mode, feedback requirements and machine safety design.
Industrial Applications
| Application | Typical Equipment | Role of the SP3402 |
|---|---|---|
| Conveyor Systems | Production conveyors and material-transfer lines | Regulates motor speed to coordinate material movement |
| Pumping Systems | Industrial process and utility pumps | Adjusts motor speed according to process demand |
| Industrial Fans | Ventilation and process-air equipment | Controls airflow through variable-speed operation |
| Extrusion Machinery | Plastic and material-processing equipment | Regulates motor speed according to production requirements |
| Winding Equipment | Web handling and material winding systems | Supports configured speed and feedback control |
| Packaging Machinery | Automated packaging and conveying equipment | Coordinates motor speed with machine sequences |
| Material Handling | Industrial movement and lifting equipment | Supports motor regulation where drive and system ratings are suitable |
| Printing Machinery | Web-fed printing and material transport systems | Regulates motor operation within the configured control arrangement |
| General Manufacturing | Industrial machines with variable-speed motors | Provides adjustable speed and motor-control functions |
Installation and Maintenance
- Verify the drive identification: Confirm the SP3402 model and its electrical ratings before installation.
- Check the supply requirements: Verify that the three-phase input supply is within the specified 380–480 V AC range.
- Inspect the installation location: Ensure the panel arrangement provides the required clearance, ventilation and protection against environmental contamination.
- Provide suitable electrical protection: Select upstream protective devices, conductors and isolation equipment according to the drive documentation and applicable electrical standards.
- 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, cable arrangement, earthing and output-terminal connections before energizing the drive.
- Configure motor parameters: Enter the applicable motor data and select the control mode required by the machine.
- Check feedback and option modules: Verify encoder wiring, communication modules and other installed options where the application uses them.
- Configure control references: Set the required run commands, speed references, acceleration and deceleration ramps, and operating limits.
- Test communication and I/O: Confirm that controller commands, status signals and configured serial communication operate as expected.
- Perform a controlled commissioning test: Test motor rotation, operating speed, stopping behavior and fault responses under suitable conditions before returning the machine to production.
- Record the configuration: Save the parameter set, installed option details, commissioning results and maintenance history for future servicing.
Related Components
| Component | Function | Relationship to the SP3402 |
|---|---|---|
| Unidrive SP Keypad | Provides local parameter access and operating status | Supports local setup and monitoring when compatible |
| Smartcard | Stores supported drive parameters and programs | Assists with configuration transfer and backup |
| Encoder Feedback Module | Interfaces with compatible motor feedback devices | Supports applicable closed-loop control configurations |
| Communication Option Module | Adds supported industrial communication interfaces | Connects the drive to compatible automation networks |
| I/O Option Module | Adds supported input and output functions | Extends signal-handling capabilities |
| Braking Resistor | Dissipates braking energy where required | Supports applications with demanding deceleration requirements |
| Three-Phase Induction Motor | Converts drive output into mechanical motion | Serves as the controlled motor load |
| PLC | Coordinates machine logic and interlocks | Sends operating commands and receives status information |
| Motor Isolation Device | Provides electrical isolation for servicing | Supports safe maintenance procedures |
| Control Power Supply | Supplies associated control circuits where required | Supports the wider drive-control installation |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Emerson SP3402 | Unidrive SP Universal AC and Servo Drive | Main product | 380–480 V AC drive rated at 40 A Heavy Duty and 43 A Normal Duty |
| Emerson SP3401 | Unidrive SP Universal AC and Servo Drive | Lower-rated model in the same frame family | Compare output-current requirements and duty classification |
| Emerson SP3403 | Unidrive SP Universal AC and Servo Drive | Higher-current model in the same frame family | Evaluate the required motor current and operating conditions |
| Emerson SP2402 | Unidrive SP Universal AC and Servo Drive | Smaller frame family | Consider only where the required motor rating and installation arrangement permit |
| Emerson SP2403 | Unidrive SP Universal AC and Servo Drive | Smaller frame family | Compare current ratings, load requirements and control configuration |
Related models are not automatically interchangeable. Selection must account for supply voltage, motor current, duty rating, control mode, feedback requirements and installed option modules.
Key Advantages
- Supports multiple motor-control strategies for industrial variable-speed applications.
- Provides separate Normal Duty and Heavy Duty output ratings.
- Includes built-in RS-485 serial communication and configurable I/O.
- Supports expansion through compatible option modules.
- Offers integrated PLC functionality for supported drive-related tasks.
- Supports Smartcard-based storage and transfer of compatible configuration data.
- Fits a range of industrial motor-control applications when correctly specified.
Technical FAQs
What are the Normal Duty and Heavy Duty ratings of the SP3402?
The SP3402 is rated at 43 A and 22 kW in Normal Duty operation, and 40 A and 18.5 kW in Heavy Duty operation. The appropriate rating depends on the motor load and the application’s overload requirements.
Can the SP3402 operate an induction motor without an encoder?
Yes. The Unidrive SP supports open-loop control modes that do not require encoder feedback. Closed-loop operation requires the appropriate feedback arrangement and configuration.
Which communication interface is built into the SP3402?
The drive includes a two-wire RS-485 serial interface and supports Modbus RTU communication. Additional industrial protocols may be available through compatible option modules.
What should be checked before replacing an SP3402 with another Unidrive SP model?
Compare the supply voltage, motor current, Normal Duty and Heavy Duty ratings, control mode, feedback requirements and installed option modules. Also verify the control wiring and parameter configuration before commissioning the replacement.