GE DS200SHVIG1B SCR High Voltage Interface Board

الوصف

The GE DS200SHVIG1B is a specific revision of the SCR High Voltage Interface Board (SHVI) used in the GE Mark V Speedtronic Turbine Control System and DC2000/EX2000 Drive Series.

It is a crucial interface that provides isolation, signal conditioning, and current measurement feedback from the drive’s high-power section (the SCR bridge) to the sensitive low-voltage control electronics.¹

Core Functions and Features

The SHVIG1B sits between the high-voltage power components and the digital control boards (like the SDCI or DCFB), acting as a vital measurement and safety buffer.

1. High-Voltage Measurement and Safety

• Attenuation: It steps down the high ²$\text{AC}$ line voltages and ³$\text{DC}$ bridge voltages to safe, low-level signals that the instrumentation circuits can read.⁴

   

• Isolation: The board provides galvanic isolation, protecting the control cards and personnel from the hazardous high-voltage components of the Silicon Controlled Rectifier ($\text{SCR}$) power bridge.

2. Current Feedback Conversion

This is the most critical function for accurate motor control:

• Shunt Signal Input: It receives the highly sensitive $\text{mV}$ signals from the current shunts.
• Frequency Conversion: The board converts these low-level ⁵$\text{mV}$ signals into a differential frequency output (typically ⁶$0 \text{ to } 500 \text{ kHz}$).⁷ Using a frequency signal is highly effective at resisting electrical noise in the drive cabinet, ensuring accurate current feedback to the main control card.

   

• Configurability: The board often includes multiple configurable jumpers to select specific attenuation or scaling factors (such as using ⁸$10:1$ Current Transformers) to match the ratings of the physical drive components.⁹

   

3. System Interfacing

• Signal Routing: It connects the high-voltage/current feedback to the Power Supply/Instrumentation Card (SDCI/DCFB) and often communicates with the Power Connect Card (PCCA).¹⁰

   

• Contactor Drivers: It typically includes the necessary driver circuits for controlling the standard and high-speed contactors associated with the power bridge.¹¹

   

• Diagnostics: The board is equipped with LED indicators to provide immediate visual alerts for blown line filter fuses.¹²

   

Part Number Breakdown (DS200SHVIG1B)

The specific lettering defines the board’s series and revision history:

The DS200SHVIG1B is essential for the protective monitoring and high-accuracy closed-loop control of the industrial drive system.