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- DST1401
- Servo Drive
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- 322 × 62 × 226 mm
- 2.1 kg
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Product Overview
The Emerson DST1401 Digitax ST Servo Drive is a compact AC servo drive for controlling servo motor speed, torque and position in industrial motion systems. It belongs to the Digitax ST family and is intended for applications where a motor must follow commanded movements accurately, such as automated assembly equipment, packaging machinery, indexing tables and machine-tool axes.
The DST1401 operates from a three-phase 380–480 V AC supply and is rated at 1.5 A output current, with a peak current rating of 4.5 A. Its Frame Size 1 construction suits installations where the drive must be integrated into a machine control cabinet alongside power distribution, motion control and motor feedback equipment.
In a typical machine axis, a motion controller sends commands to the drive, which regulates the electrical power supplied to the servo motor. Feedback from the motor encoder allows the control system to monitor movement and correct deviations from the commanded motion. The resulting performance depends on the motor, feedback device, drive configuration and mechanical load as a complete system.
The DST1401 is part of the Digitax ST servo drive range, which includes different frame sizes and electrical ratings. When selecting a replacement, engineers should verify the supply voltage, continuous and peak current requirements, motor compatibility and feedback interface rather than choosing a drive solely by its family name.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / Control Techniques |
| Model / Part Number | DST1401 |
| 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 | 1.5 A |
| Peak Output Current | 4.5 A |
| Drive Function | Servo motor speed, torque and position control |
| Motor Feedback | Compatible encoder feedback, according to the configured system |
| Application | Industrial servo motion control |
| Dimensions | 322 × 62 × 226 mm |
| Weight | 2.1 kg |
Product Features
- Three-phase AC input: Operates from the specified 380–480 V AC supply.
- Compact Frame Size 1: Fits into suitable machine control cabinets and servo drive assemblies.
- 1.5 A rated output current: Supports servo motor applications that fall within the drive’s continuous current rating.
- 4.5 A peak output current: Accommodates short-duration current demands within the drive’s permitted operating limits.
- Closed-loop motion control: Uses compatible motor feedback to regulate movement according to the configured control mode.
- Configurable drive parameters: Allows application-specific settings for motor data, feedback and motion response.
- Digitax ST system integration: Supports servo installations using compatible motors, feedback devices and control interfaces.
- Expandable system configuration: The Digitax ST family supports optional interface modules for applications requiring additional communication or control functions, subject to model compatibility.
Working Principle
The DST1401 converts incoming three-phase AC power into controlled electrical output for a compatible servo motor. The drive regulates motor current according to the selected operating mode and the motion command supplied by the machine controller.
During a positioning cycle, the controller commands the axis to move to a target position. The drive supplies the motor with the current required to accelerate, maintain motion and decelerate. The motor’s feedback device returns movement information, allowing the control loop to compare the actual response with the commanded movement and make corrections.
In packaging machinery, for example, a servo axis may need to advance material by a defined distance before a cutting or sealing operation begins. The drive must respond to the motion command while accounting for acceleration, deceleration and the mechanical load. Incorrect motor data, feedback settings or current limits can affect the axis response even when the drive itself is functioning normally.
The DST1401 does not independently determine the entire machine sequence. Position targets, interlocks and coordination between multiple axes are handled by the configured motion controller or other control equipment. The drive executes the motor-control function within the limits of its electrical ratings and installed configuration.
Role in a Digitax ST Servo Motion Control System
The DST1401 forms the motor power-control stage of a servo axis. It receives motion commands, regulates motor output and uses compatible feedback information to control the motor response.
AC Supply → DST1401 Servo Drive → Servo Motor → Mechanical Axis
Motion Controller → Drive Command Interface → DST1401 → Motor Feedback Loop
| System Component | Function | Relationship to the DST1401 |
|---|---|---|
| Three-Phase AC Supply | Provides incoming electrical power | Supplies the drive’s input power |
| Input Protection and Isolation | Supports electrical protection and safe maintenance | Must be selected according to the installation requirements |
| DST1401 Servo Drive | Regulates motor current and executes the configured drive control | Controls the connected servo motor |
| Compatible Servo Motor | Converts electrical energy into mechanical motion | Executes the commanded movement |
| Motor Encoder | Reports motor movement and position information | Supplies feedback to the compatible drive interface |
| Motor Power Cable | Carries electrical output to the motor | Connects the drive output to the motor |
| Encoder Feedback Cable | Carries feedback signals | Connects the motor feedback device to the drive |
| Motion Controller or PLC | Generates movement commands and machine sequences | Coordinates the servo axis with other equipment |
| Braking Resistor, Where Required | Dissipates regenerative energy under applicable operating conditions | Must match the drive and application requirements |
| Mechanical Coupling and Load | Transfers motor torque to the driven mechanism | Determines the mechanical response of the servo axis |
Industrial Applications
| Application | Typical Equipment | Role of the DST1401 |
|---|---|---|
| Packaging Machinery | Filling, sealing and wrapping machines | Controls servo-driven movements during packaging cycles |
| Automated Assembly | Indexing stations and component handling systems | Executes commanded movement for assembly operations |
| Labeling Equipment | Label feed and application mechanisms | Regulates motion where accurate material positioning is required |
| Machine Tools | Auxiliary positioning axes | Controls compatible servo motors for programmed movement |
| Printing and Converting | Feed rollers and web-handling mechanisms | Supports coordinated motor control for material handling |
| Pick-and-Place Systems | Transfer and positioning mechanisms | Drives suitable servo axes during programmed sequences |
| Special-Purpose Machinery | Custom-built automation equipment | Provides motor control within the specified electrical ratings |
| Industrial Retrofit Projects | Existing Digitax ST installations | Replaces a matching drive when the motor and control configuration remain compatible |
Installation and Maintenance
- Verify the drive reference: Confirm that DST1401 matches the required voltage class, frame size and current rating.
- Check the incoming supply: Ensure that the available three-phase AC supply falls within the specified operating range.
- Confirm motor compatibility: Compare the motor’s rated current, peak current, voltage and feedback requirements with the drive specifications.
- Isolate the equipment: Follow the approved electrical isolation procedure and allow the required discharge time before working on the drive.
- Inspect cabinet mounting: Check the mounting surface, clearances and ventilation arrangements against the Digitax ST installation requirements.
- Examine power connections: Inspect the incoming supply terminals, motor output connections and protective earth arrangement for damage or loose connections.
- Verify feedback wiring: Confirm that the motor encoder and feedback interface match the installed drive configuration.
- Check the motor parameters: Enter or verify the motor data and applicable current limits before enabling the drive.
- Review braking requirements: Determine whether the application requires a braking resistor or another approved means of handling regenerative energy.
- Inspect control wiring: Check the command interface, enable circuit, interlocks and any installed optional modules.
- Perform a controlled commissioning test: Verify motor direction, feedback operation, speed response and positioning behavior at a suitable test condition before returning the machine to production.
- Record maintenance findings: Document the drive reference, parameter settings, motor configuration, fault history and commissioning results.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Digitax ST Servo Motor | Converts drive output into mechanical motion | Match the motor’s electrical ratings and feedback interface |
| Motor Power Cable | Connects the drive output to the motor | Verify conductor sizing, connector arrangement and cable rating |
| Encoder Feedback Cable | Transfers motor feedback signals | Match the encoder type and electrical interface |
| Motion Controller | Generates axis commands | Confirm compatibility with the selected command and control interface |
| Braking Resistor | Dissipates regenerative energy where required | Select according to the drive’s braking requirements and duty cycle |
| Input Circuit Protection | Protects the incoming power circuit | Size according to the applicable installation requirements |
| Line Reactor, Where Required | Helps address supply-side electrical conditions | Determine the requirement from the supply characteristics and installation guidance |
| Digitax ST Keypad | Provides local drive access and parameter adjustment | Verify the required keypad and connection arrangement |
| Digitax ST Optional Interface Modules | Add supported communication or control functions | Check model compatibility, firmware and the required option module |
Recommended Related Models
| Model / Product | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Emerson DST1402 | Digitax ST AC Servo Drive | Adjacent model in the same drive family | Compare current rating, motor requirements and application duty |
| Emerson DST1403 | Digitax ST AC Servo Drive | Higher-rated model within the family | Verify electrical sizing and required peak current |
| Emerson DST1201 | Digitax ST AC Servo Drive | Related model for a different supply and rating configuration | Confirm input phase requirements and voltage class |
| Emerson DST1202 | Digitax ST AC Servo Drive | Related Digitax ST drive variant | Match the drive rating to the motor and application |
| Emerson DST1404 | Digitax ST AC Servo Drive | Higher-rated drive in the same family | Check frame size, current requirements and installation clearances |
| Emerson Digitax ST Keypad | Drive Keypad | Accessory for supported local drive operation | Verify the keypad interface and installation requirements |
| Emerson Digitax ST Braking Resistor | Braking Accessory | Supports applications requiring regenerative energy dissipation | Select according to drive compatibility and braking duty |
Key Advantages
- Operates from a three-phase 380–480 V AC supply.
- Provides 1.5 A rated output current and 4.5 A peak current.
- Supports closed-loop servo motion control with compatible feedback equipment.
- Fits suitable control cabinets using the Frame Size 1 configuration.
- Integrates with compatible Digitax ST motors and control equipment.
Technical FAQs
What supply voltage does the DST1401 require?
The DST1401 is specified for a three-phase 380–480 V AC supply. The actual installation must also meet the drive’s current, protection, earthing and supply-quality requirements.
How should the motor be selected for the DST1401?
Check the motor’s rated current, peak current, voltage requirements, feedback interface and intended duty cycle. The drive’s continuous and peak ratings must be suitable for the motor and the mechanical load.
What should be checked if the drive reports a motor feedback fault?
Inspect the encoder cable, connector seating, feedback device compatibility and drive configuration. Also verify that the selected feedback interface and motor parameters correspond to the installed motor.
When is a braking resistor required?
A braking resistor may be needed when the motor returns regenerative energy to the drive during deceleration or when the application has frequent stopping cycles. The requirement depends on the drive configuration, mechanical inertia and braking duty.