GE DS200SHVIG1BHD High Voltage Interface Board

الوصف

The GE DS200SHVIG1BHD is a specific, multi-revision version of the SCR High Voltage Interface Board (SHVI) used primarily in the GE Mark V Speedtronic Turbine Control System and the DC2000/EX2000 Drive Series.

Its fundamental role is to act as an isolated, signal-conditioning bridge that translates high-power feedback (voltage and current) from the Silicon Controlled Rectifier (¹$\text{SCR}$) bridge into a safe, reliable, and noise-immune format for the drive’s low-voltage control electronics.²

Core Functionality

The SHVIG1BHD is critical for both the control and protective monitoring of the industrial drive system:³

1. High-Voltage Protection and Isolation

• Galvanic Isolation: The board provides necessary isolation between the hazardous high-voltage $\text{SCR}$ power components and the sensitive low-voltage control cards (like the SDCI/DCFB), protecting the electronics and maintenance personnel.
• Voltage Attenuation: It steps down the ⁴$\text{AC}$ line voltage and ⁵$\text{DC}$ bridge voltage to levels that can be safely measured by the drive’s instrumentation circuitry for metering and fault protection.⁶

   

2. Current Feedback Conversion

This function ensures accurate current measurement for closed-loop motor control:

• Input Range: It accepts the low-level $\text{mV}$ signals (typically $\pm 500 \text{ mV}$) from the high-current shunts.
• Conversion to Frequency: It converts these sensitive ⁷$\text{mV}$ signals into a differential frequency output (⁸$0 \text{ to } 500 \text{ kHz}$).⁹ Converting the signal to a frequency makes the current feedback highly robust and resistant to electrical noise within the drive cabinet, ensuring accurate signal delivery to the Power Supply/Instrumentation Card.

   

• Configurability: The board includes numerous configurable jumpers (up to 17) that work with ¹⁰$10:1$ Current Transformers (¹¹$\text{CTs}$) to provide selectable current attenuation.¹² This allows the board to be precisely scaled to the current rating of the power components in the drive.

   

3. Interfacing and Diagnostics

• Signal Routing: It connects the conditioned feedback to the primary control and instrumentation cards, specifically the SDCI/DCFB and the Power Connect Card (PCCA).¹³

   

• Diagnostics: The board is equipped with LED indicators that provide a visual alert if any of the associated line filter fuses are blown, aiding in system troubleshooting.¹⁴

   

• Contactor Drivers: It typically contains the driver circuits necessary for controlling the standard and fast contactors used to energize the power section.¹⁵

   

Part Number Breakdown (DS200SHVIG1BHD)

The trailing letters denote specific revisions to the original design: