Basler Electric CBS-377 – Current Boost System for Generator Excitation

The Basler Electric CBS-377 (part number 91096001) is a current boost system designed to augment the excitation capability of voltage regulators during large load steps. When a generator experiences a sudden increase in load—such as starting a large motor or energising a transformer—the CBS-377 provides an extra boost of field current, improving voltage recovery and reducing transient dips.

Operating Principle

The system senses the generator output current and compares it to a set threshold. When the current exceeds the preset level, the CBS-377 temporarily increases the excitation current by injecting additional DC power into the field winding. This boost is maintained for a programmable duration, then gradually ramps down to normal levels. The unit works in parallel with the main regulator, enhancing its response without interfering with steady‑state operation.

• Input voltage: 120/240 V AC, 50/60 Hz

• Boost current: up to 10 A (depending on regulator output)

• Boost duration: 0.5–10 seconds (adjustable)

• Pickup threshold: 50–120% of rated current (adjustable)

• Output: isolated DC injection to field circuit

• Status indicators: boost active and fault

• Mounting: panel or chassis mount

• Operating temperature: –20 °C to +60 °C

Applications

The CBS-377 is particularly useful for generator sets feeding motor‑heavy loads, such as pumps, compressors, and conveyors. It is also beneficial in marine and offshore applications where large starting currents are common. The system enhances stability and prevents voltage collapses that could trip sensitive equipment.

Installation and Integration

Wiring is simple, with connections for AC supply, current sensing, and field injection. The unit is typically installed between the regulator output and the field winding. Adjustments for threshold and duration are made via front‑panel trimpots.

Reliability and Construction

Built with rugged semiconductors and protective circuitry, the CBS-377 is designed for continuous duty. Its conformal‑coated board and heavy‑duty enclosure withstand industrial environments. Basler's engineering ensures seamless compatibility with most Basler regulators.

In summary, the Basler Electric CBS‑377 current boost system provides essential transient support for generator excitation, improving voltage stability during heavy load changes.