Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Family | Bulletin 1394 |
| Module Type | Multi-axis servo system module |
| Motion Controller | Integrated Motion Controller, S Class (GMC) |
| Input Voltage | 360–480 VAC, 3-phase |
| Input Frequency | 50/60 Hz |
| Rated Power | 5 kW |
| Continuous Output Current | Approx. 7.36 A |
| DC Bus Voltage | 530–680 VDC nominal |
| RIO | Included |
| AxisLink | Included |
| Line Inductance | Approx. 1000 µH |
| Internal Shunt | 200 W continuous / 40 kW peak, 2-second maximum |
| Application | Multi-axis AC servo systems |
Rockwell’s Bulletin 1394 manual shows that the catalog structure identifies SJT as the three-phase 360/480 VAC system-module configuration and gives 1394C-SJT05-C-RL as the example for a Series C, 5 kW integrated-motion-controller system with RIO and AxisLink. Secondary technical references for the 1394-SJT05-C-RL configuration report 360–480 VAC input, approximately 5 kW output, 7.36 A continuous output, and a 530–680 VDC bus.
Product Introduction
The Allen-Bradley 1394-SJT05-C-RL is a Bulletin 1394 multi-axis servo system module built around an integrated GMC motion controller. It combines the high-power servo system section with motion-control functionality and provides RIO and AxisLink connectivity for coordinated multi-axis machinery. The 5 kW class configuration operates from a 360–480 VAC three-phase supply.
This architecture was intended for machine builders that needed coordinated servo axes rather than separate standalone drives. For maintenance teams, the important point is that the unit is a system-level motion controller/power module, not simply a replacement amplifier; controller configuration, AxisLink/RIO architecture, motor feedback, axis parameters, and the installed 1394 system configuration all need to match.
1394-SJT05-C-RL
Application Scenarios & Field Pitfalls
Engineering Pain Point
A failed 1394 system module can affect both servo power and the motion-control architecture. Installing a physically similar 1394 unit without checking its controller option, power rating, communication configuration, and revision can result in an apparently functional drive that cannot reproduce the original machine behavior.
Typical Applications
- Multi-axis machine tools — coordinated servo axes requiring centralized motion control.
- Packaging and converting machinery — synchronized positioning, registration, and velocity control.
- Material handling systems — coordinated servo motors with RIO-based machine control.
- Legacy GMC motion systems — existing Bulletin 1394 installations using AxisLink and/or RIO.
Technical Pitfalls to Avoid
- Do not confuse the system module with an individual axis amplifier.
The 1394-SJT05-C-RL is the system-level unit. The motor-axis hardware and feedback configuration must be evaluated as part of the complete 1394 system. - Verify the exact catalog structure.
Rockwell’s documentation uses the 1394C-SJT05-C-RL example for the Series C version. If the equipment nameplate shows1394-SJT05-C-RLwithout the additionalC, photograph and verify the complete catalog number before substitution. - Do not ignore the DC bus and regenerative system.
The reported 530–680 VDC bus and internal shunt arrangement make this a high-energy servo power section. DC-bus discharge, braking hardware, shunt circuitry, and motor deceleration behavior should be considered before service work. - Preserve the motion configuration.
Before replacement, record GMC parameters, axis assignments, feedback types, AxisLink connections, RIO configuration, and any machine-specific motion program. Hardware replacement alone does not guarantee restoration of the original machine behavior.
Related Products
- — Series C 5 kW integrated motion-control system module with RIO and AxisLink; particularly important when the nameplate contains the
Cfamily designation. - 1394-SJT05-C — Related 5 kW integrated-motion system configuration without the RL option.
- 1394-SJT05-T-RL — Related Bulletin 1394 system module with a different integrated-control configuration.
- 1394-SJT10-E — Higher-power Bulletin 1394 system configuration; not a direct 5 kW replacement.
- 1394-AM03 — Bulletin 1394 axis module for the servo system.
- 1394-AM04 — Related Bulletin 1394 axis module.
- 1394-AM07 — Higher-rated axis-module configuration within the Bulletin 1394 family.
- 1394-DIM — Bulletin 1394 digital interface module used for system-level machine I/O functions.
- 1394-UM000 — Bulletin 1394 Digital AC Multi-Axis Motion Control System documentation.
Procurement and Replacement Notes
For an Allen-Bradley 1394- replacement, match the complete nameplate catalog number, series/revision, 5 kW rating, GMC motion-controller configuration, RIO/AxisLink option, and associated axis modules.
A particularly important point is the catalog-number discrepancy between the commonly listed 1394- and Rockwell’s manual example . Do not assume the two labels are interchangeable without checking the installed system documentation and nameplate.
Because this is a legacy Bulletin 1394 system, a replacement evaluation should also include the existing motion program, axis parameters, motor/feedback combinations, RIO network, AxisLink wiring, and the condition of the DC-bus/braking circuitry.
