I/O modules

This driver shunt feedback card monitors current flow in excitation system shunts. It provides precise feedback signals for generator voltage regulation. You will find this card in GE Mark V turbine control systems.

Key Technical Specifications

Physical Layout and Rack Mounting

This feedback card measures 240 mm in width and 160 mm in height. Its depth reaches 30 mm for standard Mark V racks. The unit weighs 0.9 kilograms for straightforward installation into any slot. Two card guides secure the board firmly to the backplane.

Internal Circuitry and Energy Storage

One hundred forty-four components populate this precision measurement board. Three 470 µF capacitors form a 1410 µF total energy storage bank. This bank filters power supply noise for the high-gain amplifier. Consequently, the card measures microvolt-level shunt signals accurately. A differential amplifier rejects common-mode noise on the shunt wiring.

Shunt Input and Signal Conditioning

The card accepts 0–100 mV DC from an external current shunt resistor. A 2-point terminal block connects to the shunt leads directly. The onboard amplifier scales this signal to a 0–10V output range. Therefore, a 100 mV input corresponds to full-scale 10V output. The circuit maintains ±0.2% accuracy across the entire temperature range.

Feedback Output and Isolation

A 50-pin ribbon connector carries the feedback signal to the excitation control board. The output provides 0–10V DC proportional to shunt current. A 2500V isolation barrier protects the control side from field wiring. Green LEDs indicate power presence and normal operation. A red LED triggers if the amplifier saturates or loses input signal.

Compatibility Note

Both DS200DSFBG2A DS200DSFBG2ACB share identical electrical specifications. The ACB suffix indicates a later hardware revision with improved thermal stability. You can use either version interchangeably in any Mark V excitation system.

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