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- DST1403
- Servo Drive
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- 322 × 62 × 226 mm
- 2.1 kg
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Product Overview
The Emerson DST1403 Digitax ST Servo Drive is a three-phase AC servo drive in the Digitax ST family, used to control compatible servo motors in industrial motion systems. With a rated output current of 4.0 A and a peak output current of 12.0 A, it occupies a higher current class than the DST1401 and DST1402, making motor-current requirements an important factor when selecting this model.
The drive operates from a 380–480 V AC supply and is intended for applications that require controlled acceleration, deceleration and coordinated motor movement. Typical examples include packaging machines, material indexing systems, automated assembly equipment and servo-driven transfer mechanisms.
In a machine with repeated start-stop movements, the motor may need substantial current during acceleration and deceleration even when its average operating load is lower. The DST1403’s rated and peak current capabilities must therefore be evaluated against the motor’s electrical data, mechanical inertia and required duty cycle. A drive that meets the continuous current requirement may still be unsuitable if the application’s short-duration current demand exceeds its permitted peak rating.
The DST1403 uses the Digitax ST Frame Size 1 configuration. When replacing an existing drive, engineers should confirm the complete model number, supply voltage, feedback interface and control configuration rather than relying on the physical mounting arrangement alone.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / Control Techniques |
| Model / Part Number | DST1403 |
| Product Family | Digitax ST |
| Product Type | AC Servo Drive |
| Frame Size | Frame Size 1 |
| Rated Supply Voltage | 380–480 V AC |
| Number of Input Phases | 3 |
| Rated Output Current | 4.0 A |
| Peak Output Current | 12.0 A |
| Input Current | 6.0 A peak rating listed in the family brochure |
| Cooling Method | Internal fan |
| Drive Function | Servo motor control |
| Control Functions | Speed, torque and position control, according to the installed configuration |
| Application | Industrial servo motion control |
| Dimensions | 322 × 62 × 226 mm |
| Weight | 2.1 kg |
Product Features
- Three-phase AC supply: Operates from the specified 380–480 V AC supply class.
- 4.0 A rated output current: Supports compatible motors requiring a higher continuous current than the DST1401 or DST1402.
- 12.0 A peak output current: Accommodates short-duration current demand within the drive’s permitted operating limits.
- Digitax ST platform: Fits into compatible servo control architectures using the same drive family.
- Closed-loop motor control: Uses supported feedback equipment to regulate motor movement.
- Internal fan cooling: Removes heat generated during operation through the drive’s cooling arrangement.
- Configurable control parameters: Allows motor data, current limits and control settings to be matched to the application.
- Optional interface support: The Digitax ST family offers additional interface and control options, subject to the specific drive variant and configuration.
Working Principle
The DST1403 converts incoming three-phase AC power into controlled electrical output for a compatible servo motor. The drive regulates motor current according to the selected control mode and the commands supplied by the machine’s motion controller.
When an axis accelerates, the drive increases motor current to generate the torque needed to overcome inertia and mechanical resistance. As the motor approaches its target speed or position, the control loop adjusts the output to follow the requested motion profile. During deceleration, the drive manages the motor response and any regenerative energy according to the configured braking arrangement.
Consider an automated assembly station that moves a workpiece into a positioning fixture. The servo axis must accelerate quickly, reach the required position and settle before the next operation begins. The DST1403 controls the motor response, while the controller determines the movement sequence and coordinates the axis with the rest of the machine.
The 12.0 A peak rating is not a continuous operating rating. Current demand, overload duration, switching frequency, ambient temperature and the required motion profile all affect the usable drive capacity. Correct motor data and feedback configuration are also essential for predictable operation.
Role in a Digitax ST Servo Motion Control System
The DST1403 serves as the electrical power-control stage between the AC supply and the servo motor. It receives motion commands, regulates motor output and processes compatible feedback signals as part of the configured servo control loop.
Three-Phase AC Supply → DST1403 Servo Drive → Servo Motor → Mechanical Axis
Motion Controller → Command Interface → DST1403 → Motor Feedback and Control Loop
| System Component | Function | Relationship to the DST1403 |
|---|---|---|
| Three-Phase AC Supply | Provides incoming electrical power | Supplies the drive’s input power |
| Input Circuit Protection | Protects the incoming electrical circuit | Must suit the drive and installation requirements |
| DST1403 Servo Drive | Regulates motor current and executes the configured drive control | Controls the connected servo motor |
| Compatible Servo Motor | Converts electrical energy into mechanical movement | Executes the commanded motion |
| Motor Feedback Device | Reports motor movement and position information | Supplies feedback to the supported drive interface |
| Motor Power Cable | Carries the drive output to the motor | Connects the drive power stage to the motor |
| Feedback Cable | Transfers encoder or other supported feedback signals | Supports the motor feedback loop |
| Motion Controller or PLC | Generates motion commands and machine sequences | Coordinates the axis with other equipment |
| Braking Resistor, Where Required | Dissipates regenerative energy | Must be matched to the drive and braking duty |
| Mechanical Transmission | Transfers motor torque to the driven mechanism | Determines the load and inertia seen by the servo axis |
Industrial Applications
| Application | Typical Equipment | Role of the DST1403 |
|---|---|---|
| Packaging Machinery | Feed rollers, indexing units and sealing mechanisms | Controls repeated movements during packaging cycles |
| Automated Assembly | Positioning stations and component transfer systems | Executes programmed motion and stopping sequences |
| Material Handling | Transfer tables and servo-driven conveyors | Regulates acceleration and positioning |
| Printing and Converting | Web-feed and registration mechanisms | Controls material movement according to the machine sequence |
| Labeling Equipment | Product indexing and label-feed axes | Supports controlled movement during label application |
| Machine Tools | Auxiliary positioning mechanisms | Controls compatible servo motors within the drive ratings |
| Special-Purpose Machinery | Custom servo-driven equipment | Executes application-specific motor commands |
| Industrial Retrofit Projects | Existing Digitax ST installations | Replaces a matching drive after electrical and control compatibility checks |
Installation and Maintenance
- Verify the drive reference: Confirm that DST1403 matches the required voltage class, current rating and control configuration.
- Check the incoming supply: Verify that the available three-phase AC supply falls within the specified 380–480 V range.
- Match the motor rating: Compare the motor’s continuous and peak current requirements with the drive’s ratings and permitted overload characteristics.
- Isolate the equipment: Follow the approved electrical isolation procedure and allow the specified DC-bus discharge time before handling the drive.
- Inspect cabinet ventilation: Ensure that the internal fan has adequate airflow and that the mounting arrangement meets the installation requirements.
- Examine the power terminals: Check the incoming supply, motor output and protective earth connections for damage or loose terminations.
- Verify feedback wiring: Confirm that the motor feedback device, cable and drive interface are compatible.
- Check motor parameters: Verify the motor data, control mode, current limits and relevant feedback settings before enabling the drive.
- Review braking requirements: Determine whether the application’s inertia and stopping cycle require a braking resistor or another approved energy-management arrangement.
- Inspect control wiring: Check command signals, enable circuits, interlocks and installed option modules.
- Commission the axis: Test rotation direction, feedback response, acceleration, deceleration and positioning under controlled conditions.
- Record service information: Document the drive reference, motor configuration, parameter settings, fault history and commissioning results.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Digitax ST Servo Motor | Converts electrical output into mechanical motion | Match motor voltage, current and feedback requirements |
| Motor Power Cable | Connects the drive output to the motor | Verify cable rating, connector arrangement and installation requirements |
| Encoder Feedback Cable | Transfers motor feedback signals | Confirm compatibility with the installed feedback device |
| Motion Controller | Generates axis commands and machine sequences | Verify the required command interface and control architecture |
| Braking Resistor | Dissipates regenerative energy where required | Select according to the drive and application braking duty |
| Input Circuit Protection | Protects the incoming power circuit | Size according to the drive and applicable installation requirements |
| Line Reactor, Where Required | Addresses supply-side electrical conditions | Determine the need from the supply characteristics and installation guidance |
| Digitax ST Keypad | Provides local access to drive parameters | Verify the supported keypad interface |
| Digitax ST Option Module | Adds supported communication or control functions | Check the specific drive variant and module requirements |
Recommended Related Models
| Model / Product | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Emerson DST1401 | Digitax ST AC Servo Drive | Lower-current model in the same family | Rated at 1.5 A continuous and 4.5 A peak output current |
| Emerson DST1402 | Digitax ST AC Servo Drive | Lower-current model in the same voltage class | Rated at 2.7 A continuous and 8.1 A peak output current |
| Emerson DST1404 | Digitax ST AC Servo Drive | Higher-current model in the same family | Rated at 5.9 A continuous and 17.7 A peak output current |
| Emerson DST1405 | Digitax ST AC Servo Drive | Higher-current model in the same voltage class | Rated at 8.0 A continuous and 24.0 A peak output current |
| Emerson DST1203 | Digitax ST AC Servo Drive | Related drive in the 200–240 V family | Uses a different supply-voltage class and is not a direct substitute |
| Emerson Digitax ST Keypad | Drive Keypad | Accessory for supported local drive operation | Verify the keypad interface and installed drive configuration |
| Emerson Digitax ST Braking Resistor | Braking Accessory | Used where regenerative energy must be dissipated | Check the required resistance, power rating and drive compatibility |
Key Advantages
- Operates from a three-phase 380–480 V AC supply.
- Provides 4.0 A rated output current and 12.0 A peak output current.
- Supports servo motion control with compatible motor feedback.
- Uses internal fan cooling.
- Fits suitable installations using the Digitax ST Frame Size 1 configuration.
Technical FAQs
How does the DST1403 differ from the DST1402?
The DST1403 has a rated output current of 4.0 A and a peak rating of 12.0 A, compared with 2.7 A and 8.1 A for the DST1402. The correct choice depends on motor current demand, acceleration requirements and application duty.
Can the DST1403 supply 12.0 A continuously?
No. The 12.0 A figure is the peak output current rating. Continuous operation must remain within the drive’s rated current and applicable thermal limits.
What should be checked if the drive trips during rapid acceleration?
Review the motor current demand, acceleration settings, mechanical inertia, feedback configuration and recorded fault information. Confirm that the motor and drive ratings match the required motion profile before changing current limits.
Does the DST1403 require a braking resistor?
Not every application requires one. The need depends on regenerative energy, load inertia, deceleration frequency and the drive’s permitted energy-handling arrangement. The braking system must be selected for the actual operating cycle.