3A99125G02 COT Fiber Optic Communication Card
This COT card serves as electro-optic conversion repeater designed exclusively for Westinghouse WDPF DEH turbine control system, enabling long-distance isolated data communication between distributed DPU controllers and remote I/O racks via fiber optics instead of copper wiring to eliminate strong electromagnetic interference inside thermal and nuclear power plant control cabinets. Each single card integrates one transmit channel and one receive channel to convert parallel Q-Line backplane bus signals into optical pulses and restore incoming optical data back to standard electrical bus signals. Two pieces of 3A99125G02 are commonly paired and mounted inside 5D32207G01 clamshell-style COT chassis to establish a complete bidirectional fiber communication link, cooperating with QRD analog input, QCA analog output and 3A99116G02 MDPS power modules to build remote I/O networking structure for steam turbine governing, feedwater and reheater valve closed-loop control systems.
Description
Product Overview
This COT card serves as electro-optic conversion repeater designed exclusively for Westinghouse WDPF DEH turbine control system, enabling long-distance isolated data communication between distributed DPU controllers and remote I/O racks via fiber optics instead of copper wiring to eliminate strong electromagnetic interference inside thermal and nuclear power plant control cabinets. Each single card integrates one transmit channel and one receive channel to convert parallel Q-Line backplane bus signals into optical pulses and restore incoming optical data back to standard electrical bus signals. Two pieces of 3A99125G02 are commonly paired and mounted inside 5D32207G01 clamshell-style COT chassis to establish a complete bidirectional fiber communication link, cooperating with QRD analog input, QCA analog output and 3A99116G02 MDPS power modules to build remote I/O networking structure for steam turbine governing, feedwater and reheater valve closed-loop control systems.
Electrical & Optical Specifications
The module draws operating power of +5V and ±12VDC directly from crate backplane supplied by MDPS power board 3A99116G series. It is equipped with dual ST-type fiber ports with two factory configurable fiber options including SUB-E and SUB-F matching 8-core and 11-core industrial fiber cables respectively. Equipped with industrial grade optical transceivers, the single-mode fiber maximum transmission distance reaches 2000 meters under standard operating condition, and internal circuit matches native WDPF backplane communication rate to guarantee stable synchronous data transmission across separated cabinet layouts. The G02 revision optimizes internal EMI filter circuit and temperature compensation compared with older G01 model to cut down communication bit error rate under high noise industrial environment.
Environmental Rating
Continuous operating ambient temperature ranges from 0℃ up to +55℃ for indoor cabinet installation, while allowable storage temperature spans from -40℃ to +85℃. It works under 5% to 95% non-condensing relative humidity without corrosive gas or conductive dust contamination, and full EMC performance complies with IEC61000 industrial electromagnetic compatibility standards for heavy interference power station site application.
Installation & Replacement Instruction
It adopts standard Q-Line plug-in structure compatible with all Q-type rack slots, directly inserted into vacant slot of standard 9-slot Q-crate with automatic backplane power and bus connection after seating. G02 variant can directly substitute original G01 card without any field wiring or rack modification work. For on-site commissioning, power up the COT chassis first without connecting field fiber cables to run self-diagnosis check via onboard status indicator, then link optical fibers and verify data communication status before putting into formal system operation.
Spare Part & Maintenance Information
Original OEM production has been discontinued, available stock mainly includes factory tested refurbished and inspected used original spare modules. Standard component repair lead time takes two to four weeks with expedited emergency maintenance available for critical site breakdown, and global delivery is supported via DHL, UPS and FedEx courier service. Standard 12-month warranty is offered for all tested replacement units after shipment.
Basic Troubleshooting Guidance
Total communication loss of paired COT cards mostly originates from abnormal +5V/±12V power feed from MDPS power supply or blown rack input fuse. Intermittent data jitter or unstable link usually comes from dirty ST fiber connector end face, mismatched fiber specification or poor cabinet protective grounding. Single channel communication failure needs individual inspection of corresponding optical transceiver component and internal solder circuit of the PCB board.
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