GE DS200SHVIG1A SCR High Voltage Interface Board

الوصف

The GE DS200SHVIG1A 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.¹

Its core function is to serve as the isolated measurement and signal conditioning front-end between the high-power Silicon Controlled Rectifier (SCR) bridge and the sensitive low-voltage control electronics.²

Key Functions of the DS200SHVIG1A

The SHVIG1A is a crucial intermediary component that ensures the safety, accuracy, and reliability of the drive’s critical feedback signals.

1. High-Voltage Isolation and Attenuation

The board interfaces directly with the main power circuit, performing two critical safety steps:

• Voltage Attenuation: It steps down the high ³$\text{AC}$ line voltage and ⁴$\text{DC}$ bridge voltage to safe, manageable levels.⁵ This data is essential for the control system to calculate and monitor power quality.

   

• Galvanic Isolation: It provides essential isolation between the hazardous high-voltage power components and the control circuits, protecting the low-voltage electronics and personnel.

2. Current Signal Conversion

The SHVI board handles the precise current feedback necessary for closed-loop motor control:

• Shunt Signal Input: It receives the low-level ⁶$\text{mV}$ voltage signals from the high-current shunts (typically ⁷$\pm 500 \text{ mV}$).⁸

   

• Frequency Conversion: It converts these sensitive ⁹$\text{mV}$ signals into differential frequency outputs (e.g., ¹⁰$0 \text{ to } 500 \text{ kHz}$).¹¹ Converting the signal to a frequency makes it highly robust and immune to the electrical noise prevalent in a drive cabinet, ensuring accurate transmission to the power supply/instrumentation card (SDCI or DCFB).

   

• Configurable Attenuation: The board contains numerous configurable jumpers (often 17) that integrate with ¹²$10:1$ Current Transformers (¹³$\text{CTs}$) to provide selectable current attenuation.¹⁴ This allows the board to be finely tuned to the specific current ratings of the drive system.

   

3. Interface and Control Features

• Signal Bridge: It links the signals from the SCR bridge and Current Shunts to the main logic boards, specifically the Power Supply/Instrumentation Card (SDCI/DCFB) and the Power Connect Card (PCCA).¹⁵

   

• Contactor Drivers: It includes driver circuits for controlling both standard and fast contactors used to energize or de-energize the drive’s power section.
• Diagnostics: The board is equipped with LED indicator lights that visually alert maintenance personnel if any of the associated line filter fuses have blown.¹⁶

   

Part Number Breakdown (DS200SHVIG1A)

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

The DS200SHVIG1A is a sophisticated piece of electronics that plays a vital role in maintaining the protective monitoring and high-accuracy speed/torque control of the industrial drive system.