Description

Product Overview

The GE PWB68A993125 is a SCR Gate & Filter Card designed for critical control applications within GE’s Speedtronic Mark II gas turbine control system 13. As a core component of this legacy system, the GE PWB68A993125 plays a pivotal role in managing thyristor (SCR) triggering and signal conditioning for fuel control, temperature regulation, and turbine protection in industrial power generation and oil & gas installations.

Manufactured by General Electric, a global leader in power and automation solutions, the GE PWB68A993125 is engineered to meet the rigorous demands of gas turbine environments. It interfaces with the Speedtronic Mark II’s triple-redundant control architecture, ensuring fail-safe operation during startup, load changes, and emergency shutdowns. The card’s SCR gate drive circuitry provides precise timing for power electronics, while its filtering capabilities mitigate electromagnetic interference (EMI) to maintain signal integrity in high-voltage, high-frequency settings.

With hot-swap functionality and compatibility with legacy Speedtronic backplanes, the GE PWB68A993125 supports seamless integration into existing Mark II systems. Its robust design withstands extreme temperatures and vibrations, making it ideal for harsh industrial environments. By incorporating the GE PWB68A993125, operators achieve reliable turbine performance, reduced downtime, and compliance with safety standards in applications such as power plant steam turbines and offshore compressor stations.

Technical Specifications

Parameter Name	Parameter Value
Product Model	GE PWB68A993125
Manufacturer	General Electric
Product Type	SCR Gate & Filter Card (Speedtronic Mark II)
Input Voltage	24V DC ±10%
Output Signal	SCR trigger pulses (isolated)
Frequency Range	0–500 Hz
Isolation	1500V DC between channels
Physical Dimensions	22.8 cm × 15.2 cm × 3.2 cm (9” × 6” × 1.25”)
Weight	0.65 kg
Operating Temperature	-40°C to 70°C
Certifications	UL 508 (Industrial Control Equipment)
Compatibility	GE Speedtronic Mark II backplane
Redundancy	Supports triple modular redundancy (TMR)

Key Features and Advantages

Precision SCR Control

The GE PWB68A993125 delivers phase-controlled SCR triggering for accurate fuel valve modulation and power distribution in gas turbines. Its high-frequency response (up to 500 Hz) ensures rapid adjustment to load changes, optimizing energy efficiency and reducing emissions.

EMI/RFI Immunity

Integrated LC filter networks on the GE PWB68A993125 suppress noise from adjacent high-power components, safeguarding control signals against corruption. This feature is critical in environments with intensive electrical equipment, such as power generation facilities.

Hot-Swap Capability

Designed for online maintenance, the card can be replaced without powering down the turbine, minimizing downtime during component replacement. This is essential for continuous-process industries where interruptions could lead to significant revenue loss.

Legacy System Compatibility

As part of the Speedtronic Mark II ecosystem, the GE PWB68A993125 works seamlessly with 配套的输入输出模块（如 GE PWB68A999207）和控制器， ensuring backward compatibility with aging infrastructure. This reduces retrofit costs and extends the operational life of existing systems.

Rugged Construction

The card’s military-grade PCB materials and conformal coating protect against dust, moisture, and temperature fluctuations, ensuring reliable performance in offshore platforms, refineries, and other harsh environments.

Application Areas

Power Generation

The GE PWB68A993125 is widely used in gas turbine control systems for steam and combined-cycle power plants. It regulates fuel flow during startup sequences and maintains stable operation under varying load conditions, ensuring efficient energy production.

Oil & Gas

In offshore rigs and pipelines, the card supports turbine-driven compressors and pumps by providing precise SCR control for power management. Its EMI resistance is critical in environments with high electromagnetic noise from drilling equipment.

Industrial Manufacturing

For large-scale machinery such as cement kilns and steel mills, the GE PWB68A993125 enables smooth acceleration and deceleration of induction motors, reducing mechanical stress and extending equipment lifespan.

Emergency Shutdown Systems

During fault conditions, the card interfaces with ESD (Emergency Shutdown) logic to rapidly cut power to critical actuators, preventing catastrophic failures in high-risk applications like petrochemical plants.

Installation and Maintenance

Installation Preparation:

Backplane Alignment: Ensure the GE PWB68A993125 is securely seated in the Speedtronic Mark II backplane and locked with retaining clips.
Grounding: Connect the card’s ground terminal to the system chassis to prevent electrostatic discharge (ESD).
Cabling: Use shielded twisted-pair cables for SCR trigger signals to minimize EMI interference.

Maintenance Recommendations:

Visual Inspections: Regularly check for signs of corrosion, loose connections, or burnt components. Clean dust from the card’s surface using compressed air.
Firmware Updates: Although the GE PWB68A993125 is a hardware-only component, verify compatibility with the latest Speedtronic software revisions.
Spare Parts Inventory: Maintain a spare GE PWB68A993125 to replace faulty units promptly.
Documentation: Refer to the Speedtronic Mark II Maintenance Manual for detailed troubleshooting procedures.

Product Warranty and Support

GE provides a 1-year warranty for the PWB68A993125, covering defects in materials and workmanship. The module is 100% brand new and factory-sealed, ensuring compliance with original specifications.

For technical support, GE’s global service network offers 24/7 assistance for system integration, diagnostics, and repair. Customers can access online resources and training programs to optimize the card’s performance and safety protocols.

With spot inventory available, GE ensures 3-day delivery after payment, reducing operational risks associated with component shortages.

Product Information

Contact info

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Email: sandydcsplc@gmail.com
Phone: +86 18030182217
Wechat: +86 18030182217
Website: www.xiongbaparts.com

GE PWB68A993125 SCR Gate & Filter Card (Speedtronic Mark II)(XIONGBA)