GE DS200SHVMG1 SCR High Voltage M-Frame Interface Board

الوصف

The GE DS200SHVMG1 is a specific, early 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 signifies that this board is designed for M-Frame drives, which are typically used for applications requiring lower DC field voltage ratings compared to the larger drives that use the standard SHVI board.

Core Functions of the DS200SHVMG1

The primary purpose of the SHVM board is to provide isolated measurement and signal conditioning between the high-power $\text{SCR}$ bridge and the low-voltage control electronics, specializing in the field-side circuits of M-Frame drives.

1. Isolation and Voltage Attenuation

• Galvanic Isolation: It provides essential isolation between the hazardous high-voltage power components (like the $\text{SCR}$ bridge) and the sensitive control cards, protecting the electronics and ensuring safety.
• Voltage Attenuation: It steps down the $\text{AC}$ line and $\text{DC}$ bridge voltages to safe, readable levels for the control system’s instrumentation circuits.

2. Field Current Feedback Conversion

This is a critical function, often focused on the $\text{DC}$ field current in M-Frame drives:

• Shunt Signal Input: It accepts the low-level $\text{mV}$ voltage signals (typically $\pm 500 \text{ mV}$) from the high-current shunts monitoring the motor’s field current.
• Frequency Conversion: The board converts these sensitive $\text{mV}$ signals into a differential frequency output (e.g., $0 \text{ to } 500 \text{ kHz}$). This conversion makes the signal robust and highly immune to electrical noise, ensuring accurate current feedback to the DC Feedback (DCFB) or Power Supply/Instrumentation (SDCI) card.

3. Interfacing

• Signal Routing: It acts as the signal-conditioning interface that routes the field current feedback to the main control boards, primarily the DCFB or SDCI cards, for metering and regulator control.
• Contactor Drivers: Like its SHVI counterpart, the SHVM board usually contains the necessary driver circuits for controlling standard and high-speed contactors associated with the power bridge.

Part Number Breakdown (DS200SHVMG1)

The nomenclature follows GE’s standard format for the Mark V series:

The DS200SHVMG1 is an essential component for the control and protective monitoring of the motor field circuits in specific low-voltage/M-Frame industrial drive applications.