GE DS200SHVMG1AFE SCR High Voltage Interface Board

الوصف

The GE DS200SHVMG1AFE is a specific, late-revision model of the SCR High Voltage M-Frame Interface Board (SHVM).¹ It is primarily used within the GE Mark V Speedtronic Turbine Control System and the associated DC2000/EX2000 Drive Series.²

The “M” in SHVM is the key identifier, signifying that this board is optimized for M-Frame drives, which typically involve applications with lower DC field voltage ratings compared to drives that use the standard SHVI board.

Core Functions of the DS200SHVMG1AFE

This interface board performs the critical tasks of isolating, measuring, and conditioning power feedback signals to ensure safe and accurate control of the drive system.³

1. Electrical Isolation and Protection 🛡️

• Galvanic Isolation: The board provides a fundamental safety barrier, isolating the sensitive, low-voltage control electronics from the dangerous, high-voltage components of the Silicon Controlled Rectifier ($\text{SCR}$) power bridge.
• Voltage Attenuation: It accurately steps down the high $\text{AC}$ line voltage and $\text{DC}$ bridge voltage to safe, analog levels suitable for measurement by the control system’s instrumentation circuits (DCFB or SDCI).

2. Field Current Feedback Conversion

This is vital for precise regulator control, often focusing on the motor’s field current:

• Input: It accepts the highly sensitive, low-level ⁴$\text{mV}$ signals (typically ⁵$\pm 500 \text{ mV}$) generated by the current shunts.⁶

   

• Conversion to Frequency: It converts these analog signals into a robust differential frequency output (e.g., ⁷$0 \text{ to } 500 \text{ kHz}$).⁸ Transmitting the signal as a frequency makes it highly immune to the intense electrical noise found within the drive cabinet, ensuring reliable data for the main control board.

   

3. System Interfacing

• Signal Routing: Routes the conditioned voltage and current feedback signals to the primary control boards, such as the DC Feedback Board (DCFB) or the Power Supply/Instrumentation Card (SDCI).⁹

   

• Contactor Drivers: Includes the necessary driver circuits for controlling the standard and fast contactors within the power section.

Part Number Breakdown (DS200SHVMG1AFE)

The multi-character suffix indicates a history of specific design updates: