Product Description
The Allen-Bradley 1394C-SJT22-A is a high-power digital AC multi-axis servo control system module, part of the Allen-Bradley 1394C (Compact) series. This module serves as the central control unit for very demanding motion applications, capable of commanding multiple high-power servo motors simultaneously. The “C” in its part number signifies its compact design, offering a smaller footprint compared to the standard 1394 series, which is highly advantageous for installations with limited cabinet space. The “A” suffix typically indicates that this variant uses $\pm$10V DC analog inputs for control signals, providing a traditional and widely compatible interface for velocity or torque commands.
The Allen-Bradley 1394C-SJT22-A accepts 360-480V AC, three-phase input power, and efficiently converts it to a 530-680V DC link voltage. It delivers a substantial continuous power output of 22 kW (at 460V AC input), making it capable of controlling a large number of or very powerful servo motors. This module is known for its high efficiency (up to 99%) and includes an active soft-start inrush current limit for DC link charging, which enhances reliability and extends component life. The Allen-Bradley 1394C-SJT22-A is a crucial component for applications demanding precise, synchronized, and very powerful motion control, leveraging its high power rating and compact design.
Product Parameters
The Allen-Bradley 1394C-SJT22-A possesses the following key technical specifications:
| Parameter | Specification |
|---|---|
| Module Type | GMC System Module (Compact) / Servo Controller |
| Input Voltage | 360-480V AC, 3-Phase, 50/60 Hz |
| Input Current | 30.0 A (AC) |
| Continuous Power Output | 22 kW (at 460V AC) |
| Peak Power Output | 66 kW (typical) |
| DC Link Voltage | 530-680V DC (internal conversion) |
| Efficiency | Up to 99% |
| Input Type | $\pm$10V DC Analog Input (for control) |
| Program Memory (GML) | Typically 32K (standard for non-Turbo models, check specific documentation for exact value) |
| Communication Interfaces | SCANport, serial (for HIM) |
| Line Loss Ride Through | 20 ms (typical) |
| Internal Shunt Resistor | Built-in (capacity sufficient for some regenerative loads, but often requires external shunt kit for full regenerative capabilities) |
| Mounting | Rack-mounted within the 1394C system |
| Form Factor | Compact design compared to standard 1394 modules |
| Certifications | Tested to meet EMC Directive 89/336/EC (EN 50081-2) and Low Voltage Directive 73/23/EEC (EN 61131-2) |
Advantages and Features
The Allen-Bradley 1394C-SJT22-A offers several advantages and features, particularly suited for very high-power and space-optimized applications:
- High Power Density (Compact Design & High kW): The “C” (Compact) designation combined with a 22 kW power rating makes this module exceptionally powerful for its size, enabling complex, high-power motion control in space-constrained industrial panels.
- Significant Power Output: With a continuous power output of 22 kW, the Allen-Bradley 1394C-SJT22-A can effectively control a large number of or very powerful servo motors, making it suitable for heavy-duty multi-axis machinery.
- Analog Input Control: The “A” suffix provides standard $\pm$10V DC analog inputs for velocity or torque commands, offering wide compatibility with various control systems and a familiar interface for many machine builders.
- Exceptional Efficiency: Up to 99% efficiency minimizes energy consumption, reduces operational costs, and contributes to less heat generation in the control cabinet.
- Robust Diagnostic Capabilities: Provides configurable analog test outputs and detailed diagnostic information accessible via serial port and Human Interface Module (HIM), facilitating rapid troubleshooting and system optimization.
- Active Soft Start: Features an active soft start for DC link charging, limiting inrush currents to protect internal components and extend the module’s lifespan.
- Direct Line Connection: Designed for direct connection to 360-480V AC three-phase power, simplifying wiring and often eliminating the need for external isolation transformers.
Application Areas and Application Cases
The Allen-Bradley 1394C-SJT22-A is ideally suited for very high-power, high-precision, and space-optimized motion control applications across various industries:
- Heavy Material Handling and Logistics: Control of large gantry systems, heavy-duty robotic palletizers, and high-capacity automated storage and retrieval systems (AS/RS) that require powerful, synchronized movement of heavy loads.
- Metal Forming and Fabrication: Applications in large presses, bending machines, and cutting systems where precise control of high forces and movements is critical.
- Plastics and Rubber Industry (Large Machinery): Control of large injection molding machines, extruders, and blow molding equipment, benefiting from precise motion control for demanding processes.
- Large-Scale Packaging Machinery: High-speed packaging lines involving substantial loads or multiple complex servo-driven operations where both power and precision are paramount within a compact system.
- Wood and Paper Industry: Used in large-scale cutting, shaping, and material handling machinery that requires significant power and accurate motion control.
Application Case: A manufacturer of large automotive body panels implemented an automated press line requiring very high precision and power to control the sheet metal feeding and stamping operations. Due to limited floor space, the control cabinets needed to be as compact as possible. The Allen-Bradley 1394C-SJT22-A system module was chosen as the central controller. Its 22 kW continuous power output, combined with its compact design, allowed it to efficiently drive the numerous high-torque servo motors responsible for sheet positioning, die alignment, and press synchronization. The $\pm$10V analog input interface provided seamless integration with the plant’s existing high-performance PLC. This implementation resulted in increased production speed, improved part consistency due to precise motion control, and a significant reduction in floor space required for the control infrastructure, demonstrating the module’s capability to deliver high power and precision in a compact footprint.
Competitive Comparison
The Allen-Bradley 1394C-SJT22-A stands out in the market for high-power, compact, multi-axis servo control. While competitors like Siemens (e.g., SINAMICS S series), Bosch Rexroth (IndraDrive), and Schneider Electric (Lexium series) offer high-power servo drives, the Allen-Bradley 1394C-SJT22-A differentiates itself through its unique combination of the “C” (Compact) form factor with a very high 22 kW power rating and a traditional “A” ($\pm$10V analog) control interface, all within the robust Rockwell Automation ecosystem.
Its particular strength lies in delivering substantial power within a reduced physical size, which is a critical design factor for many modern machines. The $\pm$10V analog input provides a widely understood and robust control method, favored in many industrial environments. While competitors offer various fieldbus options and higher-level communication, the Allen-Bradley 1394C-SJT22-A provides a proven, reliable, and integrated solution for applications where a powerful, compact, and analog-controlled servo system is required, leveraging Allen-Bradley’s reputation for reliability and extensive support.
