GE DS200SHVMG1A SCR High Voltage Interface Board

الوصف

The GE DS200SHVMG1A is a specific revision of the SCR High Voltage M-Frame Interface Board (SHVM) used in the GE Mark V Speedtronic Turbine Control System and associated DC2000/EX2000 Drive Series.¹

The “M” in SHVM denotes that this board is engineered for M-Frame drives, which are typically used in applications with lower DC field voltage ratings compared to drives using the standard SHVI board.

Core Functions of the DS200SHVMG1A

This board serves as the essential isolated measurement and signal conditioning front-end for the drive’s power circuit, ensuring that control signals are safe, accurate, and noise-immune.

1. Isolation and Protection

• Galvanic Isolation: It provides a critical isolation barrier between the high-power, high-voltage Silicon Controlled Rectifier ($\text{SCR}$) components and the sensitive, low-voltage control electronics.
• Voltage Attenuation: It steps down the $\text{AC}$ line voltage and the $\text{DC}$ bridge voltage to safe, readable levels for the control system’s instrumentation circuitry (DCFB or SDCI).

2. Field Current Feedback Conversion

The board’s primary control function is providing precise field current feedback:

• Input: It accepts the low-level $\text{mV}$ voltage signals (typically $\pm 500 \text{ mV}$) from the high-current shunts that monitor the motor’s field current.
• Conversion: It converts these sensitive analog ²$\text{mV}$ signals into a highly robust differential frequency output (e.g., ³$0 \text{ to } 500 \text{ kHz}$).⁴ Converting the signal to a frequency makes it immune to the intense electrical noise prevalent in the drive cabinet, guaranteeing accurate control feedback.

   

3. System Interfacing

• Signal Routing: It routes the conditioned voltage and current feedback signals to the drive’s main control boards, specifically the DC Feedback Board (DCFB) or Power Supply/Instrumentation Card (SDCI), and often communicates with the Power Connect Card (PCCA).⁵

   

• Contactor Drivers: It typically includes the driver circuits for controlling standard and high-speed contactors used in the power section.

Part Number Breakdown (DS200SHVMG1A)

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

The DS200SHVMG1A is a crucial component for the protective monitoring and accurate control of the DC field excitation in M-Frame industrial drive systems.