GE DS200SHVMG1ACD SCR High Voltage Interface Card

الوصف

The GE DS200SHVMG1ACD is a specific, highly-revised version 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.

The “M” in SHVM is the key differentiator, indicating it is designed for M-Frame drives, which handle applications with lower DC field voltage ratings compared to the larger drives that utilize the standard SHVI board.

Core Functions of the DS200SHVMG1ACD

This board’s main job is to safely isolate and accurately condition the feedback signals from the high-power $\text{SCR}$ bridge for the low-voltage control system.

1. Isolation and Protection 🛡️

• Galvanic Isolation: Provides a crucial safety barrier, separating the sensitive control electronics from the hazardous high-voltage components of the $\text{SCR}$ power section.
• Voltage Attenuation: Steps down the high $\text{AC}$ line voltage and $\text{DC}$ bridge voltage to safe, measurable levels required 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 $\text{mV}$ signals (typically $\pm 500 \text{ mV}$) from the current shunts.
• Conversion to Frequency: It converts these analog signals into a robust differential frequency output (e.g., $0 \text{ to } 500 \text{ kHz}$). This frequency conversion makes the current feedback highly immune to electrical noise, ensuring reliable data for the main control board.

3. System Interfacing

• Signal Routing: Routes the conditioned feedback signals to the primary control boards, such as the DC Feedback Board (DCFB) or the Power Supply/Instrumentation Card (SDCI).
• Contactor Drivers: Includes the necessary driver circuits for controlling standard and fast contactors within the power section.

Part Number Breakdown (DS200SHVMG1ACD)

The multi-character suffix indicates several specific design updates: