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- DST1402
- Servo Drive
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- 322 × 62 × 226 mm
- 2.1 kg
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Product Overview
The Emerson DST1402 Digitax ST Servo Drive is an AC servo drive in the Digitax ST family, used to regulate motor current and control motion in industrial machinery. Compared with the DST1401, the DST1402 has a higher continuous output current rating, making it a separate selection option for servo axes with greater current requirements.
The DST1402 operates from a three-phase 380–480 V AC supply and has a rated output current of 2.7 A and a peak output current of 8.1 A. These ratings are relevant when matching the drive to a servo motor and its mechanical load. The correct selection depends on the motor’s current demand, acceleration profile, stopping frequency and the thermal conditions inside the control cabinet.
In a packaging machine, for example, a servo axis may need to accelerate a feed roller quickly, maintain a controlled speed during material transport and decelerate before the next indexing operation. The drive regulates motor output throughout this sequence, while the controller coordinates the movement with other machine operations.
The Digitax ST family includes different current ratings and control variants. Before replacing a DST1402, check the complete model designation, supply voltage, motor feedback arrangement and control interface. A drive from the same family is not automatically interchangeable if its current rating or installed control variant differs.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / Control Techniques |
| Model / Part Number | DST1402 |
| Product Family | Digitax ST |
| Product Type | AC Servo Drive |
| Drive Frame | Frame Size 1 |
| Rated Supply Voltage | 380–480 V AC |
| Number of Input Phases | 3 |
| Rated Output Current | 2.7 A |
| Peak Output Current | 8.1 A |
| Drive Function | Servo motor control |
| Control Functions | Speed, torque and position control, depending on system configuration |
| Cooling Method | Internal fan |
| Application | Industrial servo motion systems |
| Dimensions | 322 × 62 × 226 mm |
| Weight | 2.1 kg |
Product Features
- Three-phase AC input: Operates from the specified 380–480 V AC supply.
- 2.7 A rated output current: Supports servo applications requiring a higher continuous current rating than the DST1401.
- 8.1 A peak output current: Accommodates short-duration current demands within the permitted drive operating limits.
- Digitax ST platform: Fits into motion-control systems using compatible motors and control equipment from the same drive family.
- Closed-loop motor control: Uses compatible feedback signals to regulate motor movement.
- Internal fan cooling: Circulates air through the drive to remove heat generated during operation.
- Configurable operating parameters: Allows motor data, current limits and control settings to be matched to the application.
- Optional system interfaces: The wider Digitax ST range supports additional interface modules and control variants, subject to model compatibility.
Working Principle
The DST1402 receives three-phase AC power and converts it into controlled electrical output for a compatible servo motor. Its power stage regulates motor current according to the active control mode and the commands supplied by the motion-control system.
During acceleration, the drive increases motor current to produce the torque needed to overcome inertia and mechanical resistance. As the axis approaches its target speed or position, the control system adjusts the output to follow the programmed motion profile. During deceleration, the drive manages the motor’s response and any regenerative energy according to the installation’s braking arrangement.
Consider a machine that transfers products between conveyor sections. The servo axis must move the transfer mechanism to a defined position, stop accurately and wait for the next sequence. The controller determines when the movement starts and ends, while the DST1402 controls the motor response within its current and operating limits.
The drive’s rated and peak current figures must be considered separately. The 8.1 A peak rating does not mean that the drive can supply that current continuously. Motor selection and commissioning must account for the application’s duty cycle, acceleration requirements and drive thermal limits.
Role in a Digitax ST Servo Motion Control System
The DST1402 serves as the power-control stage between the electrical supply and the servo motor. The motion controller issues commands, the drive regulates motor output, and compatible feedback equipment reports the motor’s response.
Three-Phase AC Supply → DST1402 Servo Drive → Servo Motor → Mechanical Axis
Motion Controller → Command Interface → DST1402 → Motor Feedback and Control Loop
| System Component | Function | Relationship to the DST1402 |
|---|---|---|
| Three-Phase AC Supply | Provides incoming electrical power | Supplies the drive’s input power |
| Input Circuit Protection | Protects the incoming electrical circuit | Must be selected for the installation and drive requirements |
| DST1402 Servo Drive | Regulates motor current and executes 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 compatible drive interface |
| Motor Power Cable | Carries the drive output to the motor | Connects the power stage to the motor |
| Feedback Cable | Transfers encoder or other supported feedback signals | Closes the motor feedback path |
| Motion Controller or PLC | Generates motion commands and coordinates machine sequences | Determines the requested axis movement |
| Braking Resistor, Where Required | Dissipates regenerative energy | Must match the drive and application requirements |
| Mechanical Transmission | Transfers motor torque to the machine mechanism | Determines the load and inertia seen by the servo axis |
Industrial Applications
| Application | Typical Equipment | Role of the DST1402 |
|---|---|---|
| Packaging Machinery | Feed rollers, indexing units and sealing mechanisms | Controls servo movement during repetitive production cycles |
| Material Handling | Transfer tables and positioning mechanisms | Regulates movement between defined positions |
| Automated Assembly | Rotary indexing stations and component handling equipment | Executes programmed axis movements |
| Printing and Converting | Web-feed and registration mechanisms | Controls material movement and stopping sequences |
| Labeling Equipment | Product positioning and label-feed axes | Supports controlled motion during label application |
| Machine Tools | Auxiliary positioning axes | Controls compatible servo motors within the required current rating |
| Special-Purpose Machinery | Custom servo-driven mechanisms | Provides motor control for application-specific motion profiles |
| Industrial Retrofit Projects | Existing Digitax ST installations | Replaces a matching drive when electrical and control requirements are verified |
Installation and Maintenance
- Verify the drive reference: Confirm that DST1402 matches the required voltage class, current rating and control configuration.
- Check the incoming supply: Verify that the available three-phase supply is within the specified 380–480 V AC range.
- Match the motor rating: Check the motor’s continuous and peak current requirements against the drive’s output ratings and permitted duty cycle.
- 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 drive’s internal fan has adequate airflow and that surrounding equipment does not obstruct ventilation.
- Examine the power terminals: Check the incoming supply, motor output and protective earth connections for damage or loose terminations.
- Verify motor feedback: Confirm that the installed encoder or feedback device is compatible with the drive configuration.
- Check motor parameters: Enter or verify the correct motor data, control mode and current limits before enabling the drive.
- Review braking arrangements: Determine whether the application’s deceleration profile requires a braking resistor or another approved energy-management arrangement.
- Inspect control wiring: Check command signals, enable circuits, interlocks and any installed option modules.
- Commission the axis: Test motor direction, feedback response, acceleration, deceleration and positioning under controlled conditions.
- Record service information: Document the drive model, parameter settings, motor reference, fault history and commissioning results.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Digitax ST Servo Motor | Converts drive output into mechanical motion | Match motor current, voltage 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 drive compatibility and braking duty |
| Input Circuit Protection | Protects the incoming power circuit | Match the protection arrangement to the drive and installation |
| Line Reactor, Where Required | Addresses supply-side electrical conditions | Determine the need from the supply characteristics and installation requirements |
| Digitax ST Keypad | Provides local access to drive parameters | Verify the keypad interface and supported drive configuration |
| Digitax ST Option Module | Adds supported communication or control functions | Check the specific module, drive variant and configuration 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; check motor requirements |
| Emerson DST1403 | Digitax ST AC Servo Drive | Higher-current model in the same family | Rated at 4.0 A continuous and 12.0 A peak output current |
| Emerson DST1404 | Digitax ST AC Servo Drive | Higher-rated Digitax ST variant | Verify current requirements, frame configuration and installation conditions |
| Emerson DST1405 | Digitax ST AC Servo Drive | Higher-rated Digitax ST variant | Compare continuous current, peak current and application duty |
| Emerson DST1202 | Digitax ST AC Servo Drive | Related drive for a different supply-voltage class | Uses the 200–240 V AC family; not a direct substitute for a 380–480 V model |
| Emerson Digitax ST Keypad | Drive Keypad | Accessory for supported local operation | Confirm the required keypad interface |
| Emerson Digitax ST Braking Resistor | Braking Accessory | Used where regenerative braking energy must be dissipated | Verify resistance, power rating and drive compatibility |
Key Advantages
- Operates from a three-phase 380–480 V AC supply.
- Provides 2.7 A rated output current and 8.1 A peak output current.
- Supports servo motor control with compatible feedback equipment.
- Uses internal fan cooling for heat removal.
- Fits suitable installations using the Digitax ST Frame Size 1 configuration.
Technical FAQs
How does the DST1402 differ from the DST1401?
The DST1402 has a rated output current of 2.7 A and a peak rating of 8.1 A, compared with 1.5 A and 4.5 A for the DST1401. The choice depends on the motor’s current demand, acceleration profile and duty cycle.
Can the DST1402 supply 8.1 A continuously?
No. The 8.1 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 acceleration?
Review the motor current demand, acceleration settings, mechanical load, feedback configuration and drive fault history. Confirm that the motor and drive ratings suit the required motion profile before changing current limits.
When should a braking resistor be considered?
A braking resistor may be required when deceleration or frequent stopping causes regenerative energy to exceed the installation’s permitted handling capacity. The decision depends on the drive configuration, machine inertia and operating cycle.