Application Scenarios
A packaging line running four synchronized servo axes suddenly trips a ground fault. The operator panel shows a DC bus undervoltage on all axes simultaneously. The culprit is rarely an individual axis module—it’s the 1394-SJT05-C-RL system module, the single point that feeds DC power to every axis drive on the backplane. Without this module, the entire multi-axis system goes dark. For plants still running legacy 1394 GMC platforms in printing, converting, or material handling applications, sourcing a tested spare 1394-SJT05-C-RL often means the difference between a few hours of downtime and a multi-week production halt waiting for an obsolete component .
Parameters
| Parameter | Value/Description |
|---|---|
| Product Model | 1394-SJT05-C-RL |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | GMC System Module / Servo Controller |
| Product Line | Bulletin 1394 General Motion Control |
| Rated Power | 4–5 kW continuous / 28 kW peak |
| Input Voltage | 360–480V AC, 3-phase, 50/60 Hz |
| Input Current | 6.5 A continuous |
| Output Voltage (DC Bus) | 530–680V DC |
| Output Current | 7.36 A continuous / 15.0 A peak |
| Axis Support | Up to 4 axis modules + 4 auxiliary encoder inputs |
| Communication | Integrated Remote I/O (RIO) + AxisLink |
| Efficiency | 99% |
| Operating Temperature | 0–50 °C (32–122 °F) |
| Weight | ~12.3 kg (27 lbs) |
Technical Principles and Innovative Values
Innovation Point 1: Centralized DC Bus Architecture. The 1394-SJT05-C-RL converts three-phase AC input into a shared 530–680V DC bus that feeds all axis modules through the backplane. This design eliminates individual rectifiers in each axis drive, reducing component count, panel space, and points of failure. The 5 kW continuous rating with 28 kW peak capacity handles demanding acceleration profiles without derating .
Innovation Point 2: Dual Communication Pathways. Integrated Remote I/O enables direct communication with legacy Allen-Bradley controllers like PLC-5 and SLC 500 series. AxisLink provides a separate high-speed network for inter-module synchronization, supporting electronic gearing and camming across up to eight nodes. Together, these interfaces let the 1394-SJT05-C-RL serve as both the power source and the motion coordinator for complex multi-axis machinery .
Innovation Point 3: Resolver Feedback Compatibility. The “RL” designation means this module is configured for resolver-based motor feedback rather than incremental encoders. Resolvers offer superior durability in harsh environments—resistant to dust, oil, and temperature extremes that degrade optical encoders. This makes the 1394-SJT05-C-RL suitable for heavy industrial applications where environmental contamination is a concern .
Innovation Point 4: 99% Efficiency Design. At a time when many servo controllers dissipated significant heat, the 1394-SJT05-C-RL achieves 99% operational efficiency. This translates directly to smaller cabinet cooling requirements and longer component life. The intelligent power management and EMI filtering built into the module further reduce electrical noise that could interfere with sensitive feedback signals .
