Basler Electric CBS 305 Current Boost System

The Basler Electric CBS 305 (part number 9 2007 00 100) is a power electronics device designed to mitigate voltage dips during the starting of large induction motors. When motors start, they draw high inrush currents that can cause unacceptable voltage drops, affecting other loads and potentially tripping sensitive equipment. The CBS 305 injects a controlled boost current during the starting period, supporting the motor's inrush demand and preventing excessive voltage sag. This system is an evolution of the CBS 212, offering enhanced current capacity and advanced control features.

Operation and Control

The CBS 305 continuously monitors line voltage and motor current. When a motor start is detected, the system activates a boost module that supplies additional reactive and active current from an internal capacitor bank or auxiliary source. The boost level and duration are programmable via front‑panel controls. The system automatically deactivates once the motor reaches rated speed or after a set time. A built‑in logic prevents unnecessary boost during normal operation. The system offers adjustable boost current up to 120% of nominal load current, with response time under 15 milliseconds.

Key Features

The CBS 305 includes overcurrent protection, thermal monitoring, and fault indication via LED status indicators. It supports input voltages from 208 to 600 VAC, 50/60 Hz, making it suitable for a wide range of installations. An RS‑485 communication port enables remote monitoring and integration with building management or SCADA systems. A front‑panel display shows operating status, boost duration, and fault codes. The enclosure is rated NEMA 1 for indoor use.

Technical Specifications

Input voltage: 208‑600 VAC, 3‑phase. Boost current: selectable up to 120% of rated. Boost duration: programmable 0.5‑15 seconds. Response time:<15 ms. Control power: 24 VDC or 120 VAC. Operating temperature: –10°C to +50°C. Enclosure: NEMA 1, floor‑mount or wall‑mount. Compliance with UL 508 and IEC 60947.

Benefits and Applications

By reducing voltage dips, the CBS 305 improves power quality, prevents nuisance tripping of contactors and relays, and reduces mechanical stress on motors and driven equipment. It allows the use of smaller transformers or generators in weak networks. The system is ideal for compressor stations, conveyor systems, crushers, fans, and pumps. It is particularly useful in offshore platforms, mining operations, and industrial plants with limited utility capacity.

Installation and Commissioning

Mount the unit in a clean, ventilated area near the motor starter. Connect power leads, control wiring, and communication cables. Commissioning involves setting the boost current and duration, then verifying performance with a motor start test. The system includes self‑diagnostic routines for rapid troubleshooting.

Reliability and Maintenance

Built with industrial‑grade components and forced‑air cooling, the CBS 305 is designed for continuous operation in demanding environments. Routine maintenance includes filter cleaning and periodic capacitor health checks. The unit has a MTBF exceeding 50,000 hours.

Conclusion

The Basler Electric CBS 305 Current Boost System (9 2007 00 100) is an effective, reliable solution for overcoming voltage dip issues during motor starts. Its enhanced capacity and flexible settings make it an indispensable tool for improving power quality in demanding industrial environments.