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- AC Drive
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- 368 × 155 × 219 mm
- 2 kg
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Product Overview
The Emerson SP2404 Unidrive SP Series AC Drive is a universal variable-speed drive for industrial motor systems that require adjustable speed, controlled torque response and configurable operation. As a Size 2 model in the Unidrive SP family, it is used in applications where motor behavior must be coordinated with machine sequencing, process demand and stopping requirements.
The SP2404 supports a three-phase 380–480 V AC supply. Product literature lists a maximum continuous output current of 20.5 A, a maximum peak current of 50.7 A, and a typical motor rating of 11 kW (15 hp). Actual permissible current depends on operating conditions such as switching frequency, ambient temperature and the selected control configuration.
In a machine-control system, the drive processes run commands and speed references, then adjusts its output according to configured motor parameters. Its onboard control interfaces and optional expansion modules support integration with compatible automation equipment. Correct commissioning requires matching the drive settings to the motor, checking the intended overload profile and confirming that the selected stopping method suits the mechanical load.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / Control Techniques |
| Model | SP2404 |
| Product Series | Unidrive SP |
| Product Type | Universal Variable-Speed AC Drive |
| Frame Size | Size 2 |
| Input Supply | Three-phase AC |
| Input Voltage | 380–480 V AC |
| Maximum Continuous Output Current | 20.5 A |
| Maximum Peak Output Current | 50.7 A |
| Typical Motor Power | 11 kW |
| Typical Motor Power | 15 hp |
| Motor Control | Configurable control modes for supported motor applications |
| Onboard Communication | Modbus RTU |
| Expansion Capability | Compatible Unidrive SP option modules |
| Feedback Expansion | Available through compatible feedback options |
| Enclosure Protection | IP20 for the panel-mount version |
| Dimensions | 368 × 155 × 219 mm |
| Weight | 2 kg |
Product Features
- High peak-current capability: Supports a maximum peak output current of 50.7 A under the applicable operating conditions.
- Industrial three-phase input: Operates from a 380–480 V AC supply.
- Configurable motor control: Allows the control strategy to be selected according to the motor and application requirements.
- Adjustable speed references: Supports configured speed commands for process and machine control.
- Programmable ramp behavior: Acceleration and deceleration parameters can be adjusted to match the mechanical load.
- Integrated serial communication: Onboard Modbus RTU supports data exchange with compatible automation equipment.
- Expansion options: Compatible modules can add communication, feedback or other supported functions.
- Drive diagnostics: Operating-state and fault information assists commissioning and maintenance.
- Machine-control integration: Can be coordinated with PLC logic, external references and machine interlocks through supported interfaces.
Working Principle
The SP2404 converts incoming three-phase AC power into a controlled output for the connected motor. Its power electronics regulate motor operation according to the configured control mode, motor data and active operating references. The drive’s response depends on the application settings and the electrical and mechanical characteristics of the connected system.
The product literature lists a maximum continuous output current of 20.5 A and a maximum peak current of 50.7 A. These figures describe different operating limits: the peak rating is not a continuous operating value. Continuous current capability must be evaluated against switching frequency, ambient temperature and the applicable drive configuration.
During operation, the drive responds to run commands and speed references, applying configured acceleration and deceleration behavior. Applications with frequent stopping or high mechanical inertia may require additional assessment of the braking arrangement and the energy returned to the drive during deceleration.
If the drive trips, maintenance personnel should record the fault indication and operating conditions before changing parameters. Checking supply quality, motor wiring, reference signals, load behavior and configuration can help identify the cause and avoid unnecessary changes to protection settings.
Role in an Industrial Motor Control Architecture
The SP2404 serves as the motor-control layer between the electrical supply, machine controller and driven equipment. It regulates motor output according to its configured control strategy and provides supported status and diagnostic information for supervisory control and troubleshooting.
| System Component | Function | Relationship to the Drive |
|---|---|---|
| Three-Phase AC Supply | Supplies electrical input power | Feeds the drive through appropriately rated isolation and protective devices |
| AC Motor | Converts electrical energy into mechanical motion | Receives the drive’s controlled output |
| PLC or Machine Controller | Coordinates machine sequencing | Sends compatible run commands, references and enable signals |
| Operator Interface | Provides operator commands and setpoints | Exchanges commands or status through the configured control system |
| Speed Reference Source | Defines the requested motor speed | Supplies a compatible configured reference |
| Digital Control Circuit | Carries run, stop and interlock signals | Uses the drive’s supported control inputs |
| Modbus RTU Master | Exchanges supported drive information | Communicates through the onboard serial interface |
| Feedback Device | Supplies speed or position information where required | Requires a compatible feedback interface and supported configuration |
| Braking Arrangement | Manages regenerated energy during applicable stopping cycles | Must be selected according to the load and drive configuration |
Industrial Applications
| Application | Operating Requirement | Role of the SP2404 |
|---|---|---|
| Conveyor Systems | Coordinate motor speed with material flow and machine timing | Applies configured speed references and operating limits |
| Pumping Equipment | Adjust motor operation to changing process demand | Supports variable-speed operation when correctly matched to the pump and motor |
| Fans and Blowers | Adjust airflow through motor-speed control | Changes motor operation in response to the configured speed reference |
| Material Processing Machinery | Maintain controlled motor response under changing loads | Executes configured control parameters within applicable ratings |
| Packaging Machinery | Coordinate motor behavior with production cycles | Applies programmed speed and ramp settings |
| Winding Equipment | Coordinate motor operation with line conditions | Supports suitable configured control strategies |
| General Industrial Machinery | Integrate motor operation with automated sequences | Processes supported commands and returns operating information |
Installation and Maintenance
- Verify the model designation: Confirm that the installed unit is an SP2404 and that its supply and output ratings match the application.
- Check the incoming supply: Verify the three-phase voltage and frequency against the drive’s rating information before connecting power.
- Inspect the drive assembly: Check accessible terminals, connectors and the enclosure for damage, contamination or signs of overheating.
- Provide suitable ventilation: Follow the required mounting clearances and cooling instructions to manage heat inside the control panel.
- Verify protective grounding: Ensure protective-earth connections comply with the electrical design and applicable installation requirements.
- Assess the continuous current requirement: Compare the motor’s current demand and load profile with the applicable continuous-current rating rather than relying on the peak-current figure.
- Inspect motor wiring: Verify conductor sizing, terminal tightness, insulation and cable routing before energizing the drive.
- Review control connections: Confirm run commands, stop signals, reference inputs and machine interlocks against the electrical drawings.
- Configure motor parameters: Enter the required motor data and verify that the selected control mode suits the connected motor and application.
- Review stopping behavior: Set acceleration and deceleration parameters according to the mechanical load, process cycle and braking requirements.
- Test communication and control: Verify reference tracking, command response, Modbus RTU settings and any installed option modules before production use.
- Record commissioning results: Document motor data, parameter settings, installed options, fault history and functional test results.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Compatible AC Motor | Produces mechanical output | Verify rated voltage, current and control requirements against the drive |
| PLC or Machine Controller | Coordinates machine logic | Confirm supported command signals and interface arrangements |
| Analog Reference Source | Supplies a speed or process reference | Match the signal type and scaling to the configured input |
| Digital Control Devices | Provide run, enable and interlock signals | Verify input assignments and circuit logic |
| Modbus RTU Master | Exchanges supported drive information | Configure serial parameters and supported data mapping |
| Feedback Option Module | Adds compatible speed or position feedback | Verify the exact module and feedback device |
| Communication Option Module | Adds a supported network interface | Confirm protocol and drive compatibility |
| Braking Components | Support applicable deceleration requirements | Select according to the load and drive configuration |
| Upstream Protective Device | Protects the input supply circuit | Select according to the electrical installation design |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Emerson SP1406 | Unidrive SP AC Drive | Smaller-frame model with lower current capacity | Compare its current rating with the application’s motor requirements |
| Emerson SP2401 | Unidrive SP AC Drive | Lower-current model in the same frame group | Check whether its output-current rating is sufficient for the load |
| Emerson SP2402 | Unidrive SP AC Drive | Lower-current model in the same frame group | Compare its continuous and peak-current ratings with the required operating profile |
| Emerson SP2403 | Unidrive SP AC Drive | Related model in the same frame group | Compare its ratings and control requirements with the application before selecting |
Key Advantages
- Supports a maximum continuous output current of 20.5 A and maximum peak current of 50.7 A under the applicable conditions.
- Operates from a three-phase 380–480 V AC supply.
- Provides configurable motor control and adjustable speed references.
- Includes onboard Modbus RTU communication.
- Supports compatible expansion modules for additional communication or feedback functions.
- Supplies operating and fault information for commissioning and troubleshooting.
Technical FAQs
Why should the SP2404’s maximum peak current not be used as its continuous-current rating?
Peak current applies to short-duration operating demands, while continuous current is limited by the drive’s thermal and operating conditions. Drive selection should use the applicable continuous-current rating and account for switching frequency, ambient temperature and the machine’s overload profile.
What should be reviewed if the SP2404 trips during repeated acceleration cycles?
Check the recorded fault, acceleration ramp, motor current, load inertia and supply conditions. Confirm that the drive’s continuous and peak-current limits suit the actual cycle, then assess whether the mechanical load or braking arrangement contributes to the trips.
How can Modbus RTU communication be checked when the SP2404 does not respond to a controller?
Verify the drive address, baud rate, parity, stop bits and network wiring. Confirm that the controller uses the correct command and data mapping, and test communication status independently before changing motor-control parameters.
What information is needed before replacing an SP2404 in an existing machine?
Check the motor rating, supply voltage, control mode, installed option modules, wiring arrangement and parameter configuration. Confirm that the replacement supports the required current, feedback and communication functions, then validate machine interlocks and stopping behavior during commissioning.