Description
The Allen Bradley 1407-CGCM is a sophisticated, microprocessor-based control module designed for the comprehensive management, protection, and excitation control of three-phase synchronous generators. It integrates multiple functions—voltage regulation, synchronization, and generator protection—into a single, compact unit that communicates directly with ControlLogix systems.
Product Parameters (Datasheet)
- Model Number: 1407-CGCM
- Module Type: Combined Generator Control Module
- System Compatibility: Allen-Bradley ControlLogix (Connects via 1756-CNB ControlNet or 1756-ENBT EtherNet/IP modules)
- Sensing Input: Three-phase Generator Voltage & Current, Three-phase Bus Voltage
- Excitation Output: 0-125 V DC at 15 A continuous (Pulse Width Modulated)
- Voltage Regulation Accuracy: ±0.25%
- Protective Functions: 25 (Sync Check), 27/59 (Under/Over Voltage), 81O/U (Over/Under Frequency), 32 (Reverse Power), 40 (Loss of Excitation), 51V (Voltage Restrained Overcurrent)
- Power Supply: 18-32 V DC
Allen Bradley 1407-CGCM
Country of Origin
This precision power control module is engineered and manufactured by Rockwell Automation in the USA, designed specifically for integration with the Logix5000 controller platform.
Application Fields
The 1407-CGCM is used in complex power systems where seamless integration between the PLC and the generator is required:
- Emergency Standby Power: Managing quick-start sequences for hospitals and data centers.
- Peak Shaving: Controlling generators that supplement grid power during high-demand periods.
- Island Mode Operation: Governing local grids in remote mining or oil and gas facilities.
- Parallel Operation: Synchronizing multiple generators or generators to a utility bus.
- Marine Power Systems: Regulating onboard power for ships and offshore platforms.
Product Usage Instructions
- Mounting: Install the CGCM in a clean, dry environment, typically within a low-voltage compartment of the generator control switchgear.
- Sensing Wiring: Connect the CT (Current Transformer) and PT (Potential Transformer) secondaries to the module. Warning: Ensure CT circuits are never open-circuited while the generator is running.
- Communication Setup: Configure the module within the RSLogix 5000 / Studio 5000 environment. Use the provided Add-On Profile (AOP) for easy tag integration.
- Excitation Connection: Wire the PWM output to the brushless exciter field. Ensure the wiring is sized to handle the 15A continuous current.
- Tuning: Use the software interface to perform “Off-line” and “On-line” PID tuning for the voltage regulator and the governor control outputs.
Product Technical Description
The 1407-CGCM replaces several discrete components: a voltage regulator, a synchronizer, and a protection relay. By consolidating these into a single module on the ControlLogix network, it eliminates complex inter-panel wiring and reduces “latency” in the control loop. Technically, it functions as a smart I/O module; it performs the high-speed processing for voltage and frequency regulation locally while reporting all metering and diagnostic data to the Logix processor for high-level system logic. This architecture allows for advanced features like “Cross-Current Compensation” and “Soft Loading” to be implemented directly through the PLC code.
Q&A (Common Questions)
Q: Can the 1407-CGCM operate without a ControlLogix PLC? A: No, the module requires a Logix controller to provide the configuration parameters and to manage the operational state (Start/Stop/Auto).
Q: What is the benefit of using the CGCM over a standalone regulator? A: The primary benefit is total system integration. All generator parameters are available as tags in the PLC, allowing for superior data logging, remote monitoring, and complex load-sharing schemes.
Q: Does it support both 50Hz and 60Hz systems? A: Yes, the module is software-configurable for both frequencies and various voltage levels via the sensing PT ratios.
Q: What happens if the communication link to the PLC is lost? A: The module can be configured with “Loss of Comm” failsafe settings, allowing it to maintain the last known excitation state or shut down the generator safely.
Similar Model Recommendations
- Allen-Bradley 1407-CGCM-B (Hardware revision B)
- Basler DECS-250 (Equivalent standalone digital excitation system)
- Woodward Easygen 3000 (Integrated generator controller alternative)
- Allen-Bradley 1756-HP (High-performance series integration)
- Allen-Bradley 1407-CGCM-C (Latest hardware/firmware revision)
For further technical specifications or to request a quote for the Allen-Bradley 1407-CGCM, please contact our automation specialists.
