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- SP1404
- AC Drive
- USA
- 368 × 100 × 219 mm
- 1.4 kg
- Xiamen, China
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Product Overview
The Emerson SP1404 Unidrive SP Series AC Drive is a variable-speed AC drive for industrial motor-control systems that require adjustable speed and configurable operating behavior. As part of the Unidrive SP family, it supports applications involving induction motors and compatible servo motor configurations, with control functions selected according to the motor, feedback arrangement and machine requirements.
The SP1404 is associated with the 380–480 V three-phase model range. Its commonly listed output ratings are 5.8 A for Heavy Duty operation and 6.9 A for Normal Duty operation. These ratings help distinguish applications with different overload requirements and load characteristics. The drive should be selected according to the motor’s rated current and the operating demands of the driven equipment.
In a machine control panel, the SP1404 receives operating commands and speed references through its configured control connections. Its parameters determine how it responds to speed changes, acceleration requests, stopping commands and operating limits. The Unidrive SP platform also supports optional expansion modules for applications that need additional communication, feedback or control interfaces.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / Control Techniques |
| Model | SP1404 |
| Product Series | Unidrive SP |
| Product Type | Universal Variable Speed AC Drive |
| Input Supply | Three-phase AC |
| Input Voltage Class | 380–480 V AC |
| Input Frequency | 48–65 Hz |
| Heavy Duty Continuous Output Current | 5.8 A |
| Normal Duty Continuous Output Current | 6.9 A |
| Typical Motor Power, Heavy Duty | Approximately 3 kW, depending on supply and rating convention |
| Typical Motor Power, Normal Duty | Approximately 4 kW, depending on supply and rating convention |
| Motor Applications | Induction motors and supported servo motor configurations |
| Control Configuration | Parameter-configurable motor control |
| Braking | Dynamic braking support, subject to the installed configuration |
| Expansion Options | Compatible Unidrive SP communication and feedback modules |
| Dimensions | 368 × 100 × 219 mm |
| Weight | 1.4 kg |
Product Features
- Two duty ratings: Provides separate Heavy Duty and Normal Duty current ratings to help match the drive to the motor and load profile.
- Three-phase AC operation: Fits compatible industrial power systems in the 380–480 V class.
- Adjustable motor speed: Regulates motor operation according to the selected control mode and configured reference.
- Programmable ramp behavior: Allows acceleration and deceleration settings to be adapted to machine response requirements.
- Configurable motor control: Supports different control arrangements within the capabilities of the Unidrive SP platform.
- Dynamic braking support: Can support controlled deceleration using an appropriate braking arrangement.
- Optional feedback expansion: Allows compatible feedback interfaces to be added when required by the application.
- Communication expansion: Supports compatible option modules for integration with supported industrial networks.
- Diagnostic information: Provides operating status and fault indications for commissioning and maintenance.
- Machine-level integration: Can coordinate with PLC logic, operator controls and external interlocks through supported interfaces.
Working Principle
The SP1404 converts its three-phase AC input into a controlled electrical output for the connected motor. Its power electronics regulate motor operation according to the selected control mode, programmed motor data and incoming operating commands. The resulting output allows the motor to follow a configured speed reference within the drive’s operating limits.
The SP1404’s commonly listed continuous output-current ratings are 5.8 A in Heavy Duty operation and 6.9 A in Normal Duty operation. The selected duty must match the application requirements, including motor current, overload demand and the load’s behavior during starting and running. The motor’s power rating alone is not sufficient to determine suitability.
Acceleration and deceleration parameters determine how the drive responds to changes in speed demand. Where the machine has significant inertia or requires frequent stopping, the deceleration strategy and braking arrangement need particular attention. Incorrect settings can lead to excessive stopping time, overvoltage trips or unnecessary mechanical stress.
The drive also monitors internal operating conditions and reports faults when it detects conditions that prevent normal operation. Effective diagnosis involves checking the fault indication, supply conditions, motor wiring, control references and configured parameters before changing the drive setup.
Role in an Industrial Motor Control Architecture
The SP1404 functions as the motor-control layer between the incoming electrical supply, automation controller and driven machine. It executes the configured control strategy while providing status information that can be used by the wider system for sequencing, monitoring and fault response.
| System Component | Function | Relationship to the Drive |
|---|---|---|
| Three-Phase AC Supply | Provides 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 sequences | Sends supported run commands, references and enable signals |
| Operator Control Station | Provides local operating commands | Interfaces through the configured control connections |
| Speed Reference Source | Defines the requested motor speed | Supplies a supported reference signal or command |
| Feedback Interface | Supplies speed or position information where required | Uses a compatible feedback option and supported device |
| Braking Resistor or Braking Arrangement | Dissipates regenerated energy during applicable stopping cycles | Must be selected and installed according to the drive configuration |
| Machine Interlocks | Prevent operation under prohibited conditions | Coordinate drive enable, stopping and restart logic |
| Supervisory System | Displays machine and drive status | Uses supported communications or controller-mapped signals |
Industrial Applications
| Application | Operating Requirement | Role of the SP1404 |
|---|---|---|
| Conveyor Machinery | Adjust motor speed to match material movement | Regulates speed according to the configured reference and operating limits |
| Pumping Systems | Adapt motor speed to process demand | Supports variable-speed operation when the motor and pump duty are suitable |
| Fans and Blowers | Adjust airflow through motor-speed control | Changes motor speed in response to control commands |
| Packaging Equipment | Coordinate motor response with production timing | Applies programmed speed and ramp settings |
| Material Handling Machinery | Manage motor operation under changing load conditions | Provides adjustable-speed control within its ratings |
| General Industrial Machinery | Coordinate motor behavior with automated sequences | Executes drive commands and supplies fault and status information |
Installation and Maintenance
- Verify the model designation: Confirm that the unit is an SP1404 and that its electrical ratings match the intended motor-control application.
- Check the incoming supply: Verify the actual supply voltage, phase arrangement and frequency against the drive’s rating information before connecting power.
- Inspect the drive assembly: Check the terminals, connectors and enclosure for visible damage, contamination or signs of overheating.
- Provide suitable cooling: Follow the applicable installation clearances and ventilation requirements to prevent excessive operating temperature.
- Verify protective grounding: Ensure that protective-earth connections comply with the electrical design and relevant installation requirements.
- Match the motor to the duty rating: Compare the motor’s rated current and overload requirements with the drive’s Heavy Duty and Normal Duty ratings.
- Inspect motor wiring: Check conductor sizing, terminal tightness, insulation and cable routing before energizing the drive.
- Review the control interface: Verify the run commands, stop signals, speed reference and interlocks against the machine’s electrical drawings.
- Configure motor parameters: Enter the required motor data and confirm that the selected control mode suits the application.
- Review braking requirements: For applications involving rapid or frequent deceleration, verify the configured stopping method and any required braking components.
- Test under controlled conditions: Check motor direction, speed response, stopping behavior, control signals and fault indication before returning the machine to service.
- Record maintenance changes: Document the parameter settings, installed option modules, fault history and commissioning results for future troubleshooting.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Compatible AC Motor | Produces mechanical output | Verify rated current, voltage and control requirements against the drive |
| PLC or Machine Controller | Executes machine logic | Confirm that command signals and interface arrangements are supported |
| Operator Control Station | Provides local start, stop and adjustment commands | Verify the control wiring and stop-circuit design |
| Speed Reference Device | Supplies the required motor-speed command | Match the signal type and scaling to the configured input |
| Encoder or Feedback Device | Provides speed or position information | Requires a compatible feedback interface and supported configuration |
| Braking Resistor | Dissipates energy during applicable deceleration cycles | Confirm the required resistance, power rating and installation arrangement |
| Communication Option Module | Adds a supported network interface | Verify the exact module, protocol and drive compatibility |
| Upstream Protective Device | Protects the input supply circuit | Select according to the electrical installation design |
| Panel Cooling Equipment | Removes heat from the control enclosure | Size according to the enclosure’s thermal load and installation conditions |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Emerson SP1402 | Unidrive SP AC Drive | Lower-current model in the same product group | Compare its current ratings with the motor’s requirements and load profile |
| Emerson SP1403 | Unidrive SP AC Drive | Lower-current model in the same product group | Consider only when its output-current ratings satisfy the application |
| Emerson SP1405 | Unidrive SP AC Drive | Higher-rated model in the SP1400 group | Check the required current, duty and supply configuration |
| Emerson SP1406 | Unidrive SP AC Drive | Higher-rated model in the same group | Compare electrical ratings and installation requirements before selecting |
Key Advantages
- Offers separate Heavy Duty and Normal Duty current ratings for application matching.
- Supports adjustable-speed operation for compatible AC motor applications.
- Provides programmable acceleration, deceleration and motor-control parameters.
- Supports compatible feedback and communication expansion options.
- Can accommodate braking arrangements for applications requiring controlled deceleration.
- Supplies status and fault information to assist commissioning and maintenance.
Technical FAQs
How can regenerative energy affect the SP1404 during repeated stopping cycles?
When a motor decelerates, its mechanical energy can be returned to the drive’s DC bus. If the energy cannot be handled by the configured braking arrangement, the drive may trip on an overvoltage condition. Review stopping frequency, deceleration time and braking requirements for the actual load.
What should be checked when the SP1404 produces unexpected motor torque at low speed?
Verify the selected control mode, motor nameplate parameters, any configured autotune results and feedback settings where applicable. Also check that the motor connections and phase assignment are correct before adjusting torque-related parameters.
How can a control reference problem be distinguished from a drive output problem?
Compare the external reference command with the reference value interpreted by the drive, then review speed limits, enable conditions and active operating states. If the internal reference is correct but motor behavior remains abnormal, investigate motor data, output wiring, load conditions and fault indications.
What needs to be verified before adding a communication or feedback option module?
Check the module’s compatibility with the Unidrive SP platform, the intended protocol or feedback device, the required firmware and the available installation space. After installation, confirm parameter recognition, signal mapping and communication or feedback operation before returning the machine to service.