Allen-Bradley 1394-series1394-SJT10-C-RL
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The ALLEN-BRADLEY 1394-SJT10-C-RL is a multi-axis motion control system belonging to the Allen-Bradley 1394 SERCOS Multi-Axis Motion Control family, manufactured by Rockwell Automation. This unit functions as a coordinated motion controller and drive system designed to synchronize multiple servo axes through the SERCOS fiber-optic communication interface. The 1394-SJT10-C-RL designation indicates a system-level configuration with a 10 kVA power rating, SERCOS interface, and chassis-mount form factor with a regenerative line interface.
The 1394 system integrates a shared DC bus architecture, allowing multiple drive axes to share power resources and enabling regenerative energy exchange between axes during coordinated motion profiles. The SERCOS (Serial Real-time Communication System) interface provides deterministic, high-speed fiber-optic communication between the motion controller and drive axes, supporting precise position, velocity, and torque control loops. The system is compatible with Allen-Bradley 1394 axis modules and interfaces directly with ControlLogix and PLC-5 motion controllers via the SERCOS ring. Built-in fault detection, overcurrent protection, and bus overvoltage protection are included as standard safety features.
The 1394-SJT10-C-RL is widely deployed in applications requiring tight multi-axis coordination such as packaging machinery, printing presses, converting equipment, and assembly automation lines. Its SERCOS-based architecture makes it particularly suitable for electronic gearing and camming applications where precise phase relationships between axes must be maintained. Industries including automotive manufacturing, food and beverage processing, and web handling rely on this platform for its deterministic motion performance and integration with Rockwell Automation control architectures.
Technical Specifications
| Series/Product Family | Allen-Bradley 1394 SERCOS Multi-Axis Motion Control |
|---|---|
| Power Rating | 10 kVA |
| Input/Operating Voltage | 380 – 480 V AC, 3-phase |
| Control Type | SERCOS fiber-optic multi-axis coordinated motion |
| Communication Interface | SERCOS fiber-optic ring |
| Number of Axes | Up to 8 axes (with additional axis modules) |
| DC Bus Architecture | Shared DC bus with regenerative capability |
| Line Interface | Regenerative (RL designation) |
| Mounting | Chassis mount (C designation) |
| Operating Temperature | 0 – 50 degrees C |
| Storage Temperature | -40 – 70 degrees C |
| Relative Humidity | 5 – 95% non-condensing |
| IP/Protection Rating | IP20 |
| Certifications | UL, CE |
| Safety Features | Overcurrent protection, bus overvoltage protection, ground fault detection |
| Feedback Interface | Compatible with 1394 axis module feedback types (encoder, resolver) |
Common Fault Codes
- Fault Code 2
- Auxiliary power supply fault. The 24V DC auxiliary power supply has fallen out of tolerance or failed.
Check the 24V DC auxiliary power supply voltage at the system connector. Verify wiring integrity and replace the auxiliary power supply if voltage is out of specification. - Fault Code 7
- Bus overvoltage fault. The DC bus voltage has exceeded the maximum allowable threshold.
Check incoming AC line voltage for overvoltage conditions. Verify regenerative line interface operation and inspect the braking or regenerative circuit for faults. - Fault Code 8
- Bus undervoltage fault. The DC bus voltage has dropped below the minimum operating threshold.
Check incoming AC supply voltage and connections. Inspect fuses and contactors in the power circuit. Verify that the line interface module is functioning correctly. - Fault Code 12
- Overcurrent fault. An overcurrent condition has been detected on one or more axes.
Check motor wiring for short circuits or ground faults. Verify that the axis module current rating matches the motor requirements. Inspect the motor for winding faults. - Fault Code 16
- SERCOS communication fault. Loss of communication on the SERCOS fiber-optic ring has been detected.
Inspect all fiber-optic cables and connectors for damage, contamination, or improper seating. Verify SERCOS ring topology and check that all nodes are powered and configured correctly. - Fault Code 25
- Overtemperature fault. The system or an axis module has exceeded its thermal limit.
Check that enclosure ventilation is adequate and that cooling fans are operational. Verify that the ambient temperature is within specification. Allow the unit to cool before restarting. - Fault Code 33
- Motor feedback loss. The encoder or resolver feedback signal from the motor has been lost or is invalid.
Inspect feedback cable connections at both the motor and axis module. Check for cable damage or excessive noise coupling. Replace the feedback cable or feedback device if necessary. - Fault Code 41
- Following error fault. The position error between the commanded and actual axis position has exceeded the configured following error limit.
Check for mechanical binding or excessive load on the axis. Verify servo tuning parameters and following error limit settings in the motion controller. Inspect motor and feedback device for faults.
Frequently Asked Questions
What does the 'RL' suffix in 1394-SJT10-C-RL indicate?
The 'RL' suffix designates that this unit includes a regenerative line interface, which allows the system to return braking energy back to the AC supply rather than dissipating it as heat through resistors.
Which motion controllers are compatible with the 1394-SJT10-C-RL?
This system is compatible with Allen-Bradley ControlLogix controllers equipped with a SERCOS motion module (such as the 1756-M08SE) and with PLC-5 controllers using the SERCOS interface module. The SERCOS fiber-optic ring connects the controller to the 1394 system.
How many servo axes can the 1394-SJT10-C-RL system support?
The 1394 system supports up to 8 axes by adding individual 1394 axis modules to the shared DC bus chassis. The number of axes is limited by the power rating of the system and the current capacity of the shared bus.
What input voltage does the 1394-SJT10-C-RL require?
The system requires a 3-phase AC input in the range of 380 to 480 V AC at 50 or 60 Hz.
Can the 1394-SJT10-C-RL be used for electronic camming and gearing applications?
Yes, the SERCOS-based architecture provides deterministic, synchronized communication between axes, making it well suited for electronic gearing, electronic camming, and other coordinated multi-axis motion profiles when used with a compatible Rockwell Automation motion controller.
Troubleshooting
System fails to power up and no status LEDs illuminate
Verify that 3-phase AC input voltage is present at the line interface terminals and that the 24V DC auxiliary supply is within tolerance. Check all fuses in the power circuit.
Replace any blown fuses and restore correct AC input voltage. If the auxiliary 24V supply is absent, check the external 24V source or internal power supply board. Inspect for damaged wiring or loose connections at the input terminals.
SERCOS communication fault is active and axes will not enable
Inspect the fiber-optic cables connecting the SERCOS ring from the motion controller through each node. Check for broken, bent, or contaminated fiber connectors. Verify that all nodes on the ring are powered.
Clean or replace damaged fiber-optic cables and connectors. Ensure the SERCOS ring is correctly terminated and that all node addresses are configured without duplication. Restart the SERCOS ring initialization sequence from the motion controller.
Overtemperature fault occurs during normal operation
Check the ambient temperature inside the enclosure and compare against the 0-50 degrees C operating specification. Verify that all cooling fans within the 1394 system are spinning and that ventilation paths are not blocked.
Improve enclosure ventilation or add supplemental cooling. Clean dust from heat sinks and fan assemblies. If a fan has failed, replace it. Reduce duty cycle or derate the system if ambient temperature cannot be reduced.
Axis exhibits following error faults under load
Monitor the position error in the motion controller diagnostics during a move profile. Check for mechanical binding, excessive friction, or load inertia mismatch. Verify servo gain tuning parameters.
Re-tune the servo loop gains for the affected axis using the motion controller's auto-tune or manual tuning tools. Increase the following error limit if the application allows. Address any mechanical issues such as binding or backlash that may be contributing to the error.
DC bus overvoltage fault trips during deceleration
Monitor DC bus voltage during deceleration ramps. Verify that the regenerative line interface is active and that the AC supply can accept regenerated energy. Check for faults in the regenerative circuit.
Verify that the regenerative line interface module is correctly configured and operational. Increase deceleration time in the motion profile to reduce regenerative energy peaks. Inspect the line interface power components and connections for faults.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 1394-series1394-SJT10-C-RL are:
Power Supply Related Issues
- No power / drive not turning on
- Blown fuses
- Defective rectifier bridge
- Damaged DC bus capacitors
- IGBT / MOSFET module failure
- Overvoltage / undervoltage errors
Control & Electronics Failures
- Faulty control board or PCB damage
- Firmware or memory corruption
- Fieldbus communication errors (Profibus, Modbus, EtherCAT, CANopen)
- Input / output circuit damage
- Gate driver module failure
Motor Control Problems
- Motor not starting or no output
- Unstable speed control
- No torque output
- Trip during acceleration or deceleration
- Encoder feedback errors
Thermal & Cooling Defects
- Overheating due to failed cooling fans
- Defective temperature sensors
- Poor heatsink performance
Mechanical & Environmental Damage
- Burnt or loose connectors
- PCB track damage
- Corrosion or moisture ingress
- Oil, dust or contamination damage
- Cracked solder joints
Error Codes & Drive Trips
- Overcurrent faults (OC)
- Ground fault / earth leakage error
- Short-circuit fault
- Motor or drive overload
- Overvoltage or undervoltage error
- Undervoltage trip when starting or stopping
- Phase loss / imbalance
- Synchronization issues with multiple drives
Other
- Display defect
- Control keys or keypad not working
- Parameters no longer readable or lost
- Brake resistor problems (brake chopper defect)
- Internal relays/contactors defective
- EMI/RFI interference due to defective filters
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