DST1404P Emerson Nidec DST1404P Servo Drive New Factory Sealed
Control Techniques DST1404P | Digitax ST Plus Servo Drive
380/480V 3-Phase, 5.9Arms Continuous / 17.7Arms Peak, 4hp Heavy Duty, Encoder Feedback, SM Option Modules
Overview
The Control Techniques DST1404P is the Plus variant of the Digitax ST compact servo drive at the 380/480V, 5.9Arms rating. This full-functionality motion controller features a housing that is only 2.5 inches wide, making it one of the most compact servo drives in its class capable of coordinating multi-axis machine cells with onboard processing and drive-to-drive communication.
The Digitax ST family differentiates itself from conventional servo drives by integrating varying levels of autonomous motion control capability directly into the drive hardware—not just the power electronics and feedback processing, but the programming environment and axis sequencing logic as well.
The four variants (Base, Indexer, Plus, EZMotion) share the same physical housing and power section, differing only in their onboard intelligence level. The Plus variant represents the highest level of autonomous capability, embedding the full IEC 61131-3 programming environment and enabling decentralized architecture where each drive axis executes its own motion program while synchronizing with peers.
The 5.9Arms continuous / 17.7Arms peak specification means the DST1404P can deliver three times its rated continuous current for short bursts. This peak current capability determines how aggressively a servo axis can accelerate and decelerate, making it ideal for applications requiring high-acceleration positioning and rapid cycle speeds.
Key Specifications
| Input |
3-phase, 380/480V AC ±10%, 50/60Hz |
| Output Current (Continuous) |
5.9Arms |
| Output Current (Peak) |
17.7Arms (300%) |
| Power Rating (Heavy Duty) |
4 hp |
| Enclosure |
IP20 |
| Dimensions (H×W×D) |
12.7"×2.5"×9.0" |
| Weight |
4.6 lb |
| Variant |
Plus (P) — onboard motion controller |
| Built-in Communication |
CTNet, CTSync |
| SmartCard |
Included |
| Feedback |
Encoder (incremental, SinCos, EnDat, SSI, Resolver via SM) |
| Configuration Software |
CTSoft / SyPTPro |
Digitax ST Plus — Onboard Motion Controller and CTNet
The "Plus" designation identifies the DST1404P as the variant with a full-functionality IEC 61131-3 motion controller embedded in the drive. The controller runs PLCopen-compliant motion function blocks for velocity control, position control, homing, electronic gearing, and camming.
What sets the Plus apart from the Indexer variant is the addition of CTNet and CTSync communication. CTNet is Control Techniques' high-speed deterministic drive-to-drive network, running at up to 5 Mbit/s with cycle times as low as 2 ms. In multi-axis machines, CTNet carries position, velocity, and synchronization setpoints between drives at speeds unmatched by external PLC systems.
CTSync adds hardware-level clock synchronization between drives, allowing axes to maintain sub-millisecond timing relationships for applications like register control in printing, flying shear synchronization, or tension-coupled winding.
The SyPTPro programming environment provides both text-based and graphical IEC 61131-3 editors for programming machine sequences, motion profiles, I/O logic, and CTNet communications in a single development tool.
SM Option Modules — Click-In Expansion
The Digitax ST drive accepts a single SM (Solution Module) option module that clips into the drive's expansion slot without tools. This "click-in" mechanism allows field changes to the drive's communication interface or I/O expansion without drive replacement.
Available SM modules include:
- Fieldbus communication: SM-PROFIBUS-DP, SM-DeviceNet, SM-CANopen, SM-EtherCAT, SM-INTERBUS, SM-Ethernet
- I/O expansion: SM-I/O Plus (6 digital in, 3 digital out, 2 analog in/out), SM-I/O Lite, SM-I/O 32
- Feedback interface: SM-Encoder Output Plus, SM-Resolver
The SmartCard supplied with every Digitax ST stores the complete drive parameter set including SM module configuration. Swapping a drive in the field requires only inserting the SmartCard from the removed drive into the replacement—the replacement drive reads the SmartCard and adopts the original configuration automatically.
Frequently Asked Questions
Q1: The DST1404P has built-in CTNet. Is a separate network interface module required to use CTNet, or is it native to the Plus variant?
CTNet and CTSync are native to the Plus variant's onboard hardware—no SM module is required. The CTNet connector is part of the drive's built-in interface. The SM option slot on the DST1404P is available for different expansion, typically a fieldbus interface for connection to the plant automation network while CTNet handles drive-to-drive coordination.
Q2: What motor feedback types does the DST1404P support without additional SM modules?
Without an SM module, the DST1404P's native feedback input accepts incremental encoders (differential TTL/RS422 quadrature with marker channel), SinCos encoders (1Vpp differential sine-cosine), and absolute encoders communicating over EnDat or SSI protocols. Resolver feedback requires the SM-Resolver option module.
Q3: The drive is rated at 5.9Arms continuous and 17.7Arms peak. How long can the drive sustain peak current?
Peak current capability is thermally limited by the drive's power electronics and the motor's winding temperature rise rate. The 300% peak-to-continuous ratio represents instantaneous peak current typically sustained for the duration of single acceleration or deceleration events (seconds rather than minutes). For repetitive duty cycles, thermal modeling must confirm that average heating does not exceed rated limits.
Q4: Can the DST1404P be configured using CTSoft from a laptop without the optional keypad?
Yes. All Digitax ST parameters can be accessed and configured via CTSoft software running on a Windows PC connected to the drive's front-panel RJ45 programming port or built-in RS485 interface. The optional keypad provides convenient front-panel access during commissioning but is not required.
Q5: The DST1404P is rated IP20. What does this require from the installation environment?
IP20 protects against solid objects larger than 12.5mm but provides no protection against water, liquids, or fine dust. The DST1404P requires installation in a closed, clean enclosure—typically an IP54 or IP65 rated control cabinet—where the surrounding panel provides environmental protection. Direct exposure to machine coolant, cutting fluid mist, or any liquid is not permissible.
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