Basler Electric 90 17709 112 – Static Voltage Regulator Control Board

The Basler Electric 90 17709 112 is a dedicated control board for static voltage regulators used in generator excitation systems. This PCB houses the regulation logic, reference circuitry, and gate‑pulse generation stages required for closed‑loop voltage control, offering a reliable platform for both new regulators and field upgrades.

Technical Design

The board integrates a high‑impedance voltage sensing input that accepts signals from PTs, an error amplifier with PID compensation, and a phase‑controlled oscillator that generates firing pulses for the SCR power bridge. The control loop is optimized for fast transient response while maintaining stability across a wide range of generator sizes. On‑board trimpots allow adjustment of voltage setpoint, gain, and damping to match specific machine characteristics.

• Input voltage: 120/240 V AC (sensing)

• Control power: derived from sensing input

• Output: isolated gate pulses for 3‑phase SCR bridge

• Adjustments: voltage, stability, droop, and under‑frequency

• Protection: loss‑of‑sensing detection, over‑excitation limiting

• Diagnostics: LED indicators for power and regulation status

• Connectors: screw terminals and pin headers

• Construction: FR4, double‑sided, conformal coated

• Operating temperature: –20 °C to +65 °C

Role in Excitation Systems

This control board is typically paired with a thyristor power stage to form a complete static exciter. It is used in generators from a few hundred kVA to several MVA, providing the precise field current control needed for stable voltage under varying load and network conditions.

Installation and Compatibility

The board mounts inside a regulator enclosure using standoffs. All connections are made via pluggable terminal blocks for ease of wiring. It is designed to be compatible with most Basler power bridges and can also be adapted to third‑party SCR assemblies with appropriate interface settings.

Quality and Longevity

Manufactured with high‑grade components and subjected to full functional testing, the 90 17709 112 board offers excellent reliability. Its conformal coating protects against environmental factors, ensuring consistent performance over decades of service.

In summary, the Basler Electric 90 17709 112 control board is a precision component that forms the intelligence behind static voltage regulators, delivering accurate and reliable excitation control.