GE DS200SHVMG1ACC SCR High-Voltage Interface Board

الوصف

The GE DS200SHVMG1ACC is a specific, highly-revised version of the SCR High Voltage M-Frame Interface Board (SHVM). It’s used in the GE Mark V Speedtronic Turbine Control System and associated DC2000/EX2000 Drive Series.¹

The “M” in SHVM signifies that this board is engineered for M-Frame drives, which typically handle applications with lower DC field voltage ratings compared to the larger drives that utilize the standard SHVI board.

Core Functions of the DS200SHVMG1ACC

This board performs the crucial task of safely isolating and conditioning feedback signals from the drive’s high-power section for the low-voltage control system.

1. Electrical Isolation and Protection 🛡️

• Galvanic Isolation: Provides a mandatory safety barrier, isolating the sensitive control electronics from the hazardous high-voltage components of the ²$\text{SCR}$ power bridge.³

   

• Voltage Attenuation: Steps down the high $\text{AC}$ 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

Its primary control function is to provide precise, noise-immune feedback, often focused on the motor’s field current:

• Input: It accepts the highly sensitive, low-level $\text{mV}$ signals (typically $\pm 500 \text{ mV}$) from the current shunts.
• Conversion: It converts these analog signals into a robust differential frequency output (e.g., ⁴$0 \text{ to } 500 \text{ kHz}$).⁵ This frequency-based signal transmission resists the strong electrical noise present in the drive environment, ensuring accurate current feedback for regulator control.

   

3. System Interfacing

• Signal Routing: It routes the conditioned feedback signals to the main control boards, such as the DC Feedback Board (DCFB) or the Power Supply/Instrumentation Card (SDCI).⁶

   

• Contactor Drivers: It typically includes the driver circuits for controlling standard and fast contactors associated with the power section.

Part Number Breakdown (DS200SHVMG1ACC)

The multi-character suffix indicates several specific design updates: