Description
Allen‑Bradley 1407-CGCN (often named 1407-CGCM ControlNet variant) is a Combination Generator Control Module (CGCM)
Brand: Rockwell Automation Allen‑Bradley | Model: 1407-CGCN | Series: 1407 CGCM Combination Generator Control Module (ControlNet Version)
Product Title & Description
The Allen‑Bradley 1407-CGCN (often named 1407-CGCM ControlNet variant) is a Combination Generator Control Module (CGCM), an integrated generator excitation & synchronizing controller. It provides AVR automatic voltage regulation, generator synchronization, power factor / VAR control and generator protection for synchronous gensets. Widely used in power plant backup generators, cogeneration systems, offshore power stations, combined cycle units. It is critical spare for legacy Rockwell generator control systems.
1407-CGCN
Core Product Overview
1407-CGCN / CGCM is an all-in-one genset controller, communicating to ControlLogix PLC via ControlNet:
- 4 excitation control modes: AVR, FCR field current regulation, Power Factor, Reactive Power(VAR)
- Generator synchronizing check & auto-synchronization for paralleling
- Built-in generator protection: overexcitation OEL, underexcitation UEL, Volts/Hertz protection, line drop compensation
- Built-in power metering: voltage, current, power, reactive power, frequency
- ControlNet communication to 1756 ControlLogix platform for interlock, monitoring and setpoint control
- Support redundant dual CGCM hot standby for high availability power generation system
Lifecycle note: 1407-CGCN / CGCM series is discontinued. Only NOS or refurbished spare available for existing generator control retrofit & maintenance. Succeeding variant: 1407-CGCM-DLR (EtherNet/IP DLR ring).
Main Technical Specifications
- Manufacturer: Rockwell Automation Allen‑Bradley
- Model: 1407-CGCN (CGCM ControlNet)
- Product Type: Combination Generator Control Module
- Communication: ControlNet
- Power supply: 24VDC (18~32VDC)
- Frequency range: 20~90 Hz
- Metering voltage: up to 208VLL
- Excitation output: control generator exciter field current
- Mounting: Vertical panel mount (required for heat dissipation)
- Required clearance: 2.5 inch on both sides, 4 inch top & bottom
- Operating Temperature: -20°C ~ +70°C
- Storage Temperature: -40°C ~ +85°C
- Relative Humidity: 5%~95%, non-condensing
- Protection Class: IP20 (installed inside electrical enclosure)
- Certifications: CE, UL
Quality Control Procedures
Rockwell CGCM modules comply with ISO9001 and IEC power generation control standards.
- Incoming Component Inspection: excitation drive circuit, voltage sampling, ControlNet communication chip, signal transformers screening.
- Assembly with unique serial number for full lifecycle traceability.
- Full functional test: AVR regulation test, synchronizing simulation, protection trip test, ControlNet communication test.
- Environmental stress screening: thermal cycling, vibration, EMC surge test for power plant and offshore cabinet environments.
- Final inspection & packing: visual inspection, anti-static packaging with factory test report.
Brand Related Matching & Replacement Models
- 1407-CGCM-DLR: EtherNet/IP DLR ring network successor model
- 1756-CNB: ControlNet communication card for ControlLogix
- 1753-L32BBBM-8A: GuardPLC safety controller for generator emergency trip interlock
- 81001-450-53-R: PowerFlex7000 MV drive SGCT power module
1407-CGCN
FAQ
Q1: What is 1407-CGCN used for? A1: Integrated generator excitation controller, perform AVR voltage regulation, paralleling synchronization, reactive power control and generator protection for synchronous generators.
Q2: What communication interface does 1407-CGCN adopt? A2: ControlNet, exchange data with Allen‑Bradley ControlLogix PLC.
Q3: Is 1407-CGCN still in production? A3: Discontinued. Only NOS and refurbished spare for existing genset control cabinets.
Q4: Can it work in redundant configuration? A4: Yes, dual CGCM redundant hot standby, auto tracking and seamless switchover.
Q5: Warranty for Allen‑Bradley 1407-CGCN? A5: Original / refurbished unit carries standard 12-month factory warranty under proper installation and operating conditions.
Installation & Configuration Guide
7.1 Pre-installation Preparation
Verify 1407-CGCN unit, inspect terminal blocks and ControlNet port. Prepare 24VDC power, voltage / current PT/CT wiring, ControlNet coax cable, ControlLogix controller. Isolate generator and high voltage before installation.
7.2 Installation Steps
Mount module vertically in control cabinet, maintain required top/bottom/side clearance for heat dissipation. Wire PT voltage, CT current, excitation field wiring and digital I/O signals. Connect ControlNet coaxial cable, install ControlNet terminators at bus endpoints. Single-point shield grounding in cabinet.
7.3 System Configuration & Commissioning
Power up module, check status LED. Configure generator parameters, AVR PID, protection thresholds, synchronizing window in CGCM software. Perform static PT/CT calibration, dry-run synchronization simulation. Do on-load test to verify voltage regulation and reactive power control. Test protection trip functions, backup redundancy switchover. Save parameter backup.
7.4 Maintenance & Precautions
Periodically check CT/PT wiring, excitation cable insulation and cabinet heat dissipation. Keep ControlNet coax connectors clean. If voltage instability or synchronization failure, check PT/CT signals and wiring before replacing CGCN module.
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