Description
Application Scenarios
In high-speed CNC machining centers, servo drives must deliver rapid acceleration to minimize non-cutting time while maintaining precise position holding during cutting operations. A common failure mode in such applications occurs when the drive lacks sufficient peak current headroom to handle the inertia mismatch between the motor and load during aggressive accel/decel profiles—resulting in position overshoot, following errors, or drive trips. The DST1405 addresses this challenge with its 300% peak current capability (24A from an 8A continuous rating), providing the transient torque required for rapid axis reversals without compromising continuous thermal performance . Its support for multiple feedback types—including resolver, incremental encoder, SinCos, SSI, EnDat, and Hiperface—enables adaptation to virtually any servo motor in a retrofit or new machine build .
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | DST1405 (Manufacturing Part No. 3098-0070) |
| Manufacturer | Emerson / Control Techniques |
| Product Category | Three-Phase AC Servo Drive |
| Series | Digitax ST |
| Rated Input Voltage | 380-480V AC, 3-phase, 50/60 Hz |
| Nominal Current | 8.0 Arms |
| Peak Current | 24.0 Arms (3× overload) |
| Maximum Continuous Output Current | 9.9 A |
| Power Output | Approximately 3.32-3.65 kW |
| Internal DC Bus Capacitance | 220 μF |
| Maximum Additional DC Bus Capacitance | 660 μF |
| Physical Dimensions | 330 × 70 × 230 mm (approximately) |
| Weight | 2.1-3.0 kg (excluding keypad and option modules) |
| Protection Rating | IP20 (UL Type 1 / NEMA 1) |
| Operating Temperature | 0°C to 50°C (derate above 40°C) |
| Feedback Compatibility | Resolver, Incremental, SinCos, SSI, EnDat, Hiperface |
| Safety Function | Safe Torque Off (STO), SIL3, PL e |
| Communication Options | Ethernet/IP, PROFIBUS-DP, CANopen (via option modules) |
Technical Principles and Innovative Values
Innovation Point 1: 300% Peak Overload Architecture. The DST1405 is engineered around a 300% peak current capability, allowing the drive to deliver 24A for 0.25 seconds from an 8A continuous base . This design philosophy directly addresses the inertia mismatch challenges common in machine tool and packaging applications, where load inertia can exceed motor inertia by 10:1 or more. The DST1405’s transient current headroom ensures that acceleration profiles complete without position error accumulation, even under aggressive motion commands .
Innovation Point 2: Smartcard Parameter Storage and Cloning. The DST1405 supports removable Smartcard technology for parameter storage and drive cloning . When a drive requires replacement, maintenance personnel simply transfer the Smartcard to the new unit; all configuration parameters—including motor feedback settings, tuning gains, and application-specific logic—restore automatically. This eliminates the time-consuming manual parameter re-entry that typically accompanies drive replacement, reducing mean-time-to-recovery from hours to minutes.
Innovation Point 3: Integrated STO SIL3 Safety Function. The DST1405 incorporates Safe Torque Off (STO) functionality certified to SIL3 and PL e standards . This integrated safety architecture eliminates the need for external safety relays in many machine safety circuits, reducing cabinet space, wiring complexity, and overall system cost. The STO function prevents unexpected motor starting during maintenance operations without removing power from the drive’s control electronics .
Innovation Point 4: Compact High-Power Density Design. Despite its 3.65 kW power output and 24A peak current capability, the weighs only 2.1-3.0 kg and occupies a compact 330 × 70 × 230 mm footprint . This power density enables machine builders to reduce control cabinet dimensions or increase axis count within existing enclosure footprints.
