GE DS200SHVIG1BBB SCR High Voltage Interface Board

الوصف

The GE DS200SHVIG1BBB 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 an essential measurement and safety interface that links the high-power section (the SCR bridge) of the drive to the sensitive low-voltage control electronics (like the SDCI/DCFB boards).

Core Functions of the DS200SHVIG1BBB

This board serves as a highly specialized buffer, ensuring that the critical high-voltage and high-current signals are safely attenuated and converted for accurate use by the digital controller.

1. Signal Conditioning and Isolation

The board performs the crucial tasks of isolation and attenuation for drive protection and metering:

• Voltage Attenuation: It steps down the high ¹$\text{AC}$ line voltages and ²$\text{DC}$ bridge voltages to safe, low-level signals that can be measured by the control circuitry.³ This is necessary for system diagnostics and fault protection.

   

• Galvanic Isolation: The board provides galvanic isolation between the hazardous high-voltage $\text{SCR}$ bridge and the sensitive low-voltage control cards, protecting the electronics from power surges and ensuring personnel safety.

2. Current Feedback Conversion

This is vital for the drive’s closed-loop speed and torque control:

• Shunt Signal Input: It receives the highly sensitive, low-level $\text{mV}$ voltage signals (typically $\pm 500 \text{ mV}$) from the high-current shunts.
• Frequency Conversion: The board converts these ⁴$\text{mV}$ signals into a robust differential frequency output (e.g., ⁵$0 \text{ to } 500 \text{ kHz}$).⁶ Converting the signal to a frequency makes it highly immune to the intense electrical noise found within the drive cabinet, guaranteeing reliable feedback to the instrumentation board (SDCI or DCFB).

   

• Configurability: The board includes configurable jumpers (e.g., ⁷$17$ jumpers) that enable the use of ⁸$10:1$ Current Transformers (⁹$\text{CTs}$) to provide selectable current attenuation, allowing the board to be precisely matched to the current ratings of the power components.¹⁰

   

3. Interface and Control

• System Interface: It routes the conditioned feedback signals to the main control boards, including the SDCI/DCFB (Power Supply and Instrumentation) card and the PCCA (Power Connect Card).¹¹

   

• Contactor Control: The board often includes driver circuits for both standard and high-speed contactors used in the drive’s power train.¹²

   

• Diagnostics: LED indicators are included on the board to provide a visual alert when associated line filter fuses are blown, facilitating quicker troubleshooting.¹³

   

Part Number Breakdown (DS200SHVIG1BBB)

The three final letters indicate the specific revision history:

The DS200SHVIG1BBB is a high-reliability component crucial for the protective and regulatory performance of the GE industrial drive system.