Basler Electric AVC63-4 – Automatic Voltage Regulator for Generators

The Basler Electric AVC63-4 (also referenced as AVC634) is a robust solid‑state automatic voltage regulator (AVR) designed to maintain stable terminal voltage on synchronous generators. Its compact size and straightforward configuration make it suitable for a broad range of alternators, from small portable sets to industrial prime‑power units.

Regulation and Protection

The AVC63-4 features a precision voltage sensing circuit with an adjustable reference, allowing the operator to set the generator output voltage from 90% to 110% of nominal. The regulator employs a fast‑acting thyristor bridge to control the field current, with response times under 50 ms for transient conditions. Built‑in under‑frequency compensation reduces excitation during overspeed, protecting the generator from overvoltage. An over‑excitation limiting function prevents field winding overheating during sustained overload.

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

• Output current: 4 A continuous (6 A surge)

• Output voltage: up to 120 V DC

• Regulation accuracy: ±0.5% of setpoint

• Voltage adjustment range: ±10%

• Frequency roll‑off: adjustable 45–65 Hz

• Protections: over‑excitation, loss of sensing, short circuit

• LED indicators: power, regulation, and fault

• Mounting: panel or chassis, with integral heat sink

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

Applications

This AVR is widely used in generator sets for construction, agriculture, marine, and backup power. Its compatibility with both permanent magnet generator (PMG) and auxiliary‑winding excitation systems makes it a flexible choice for OEMs and retrofit projects. The AVC63-4 also supports parallel operation when equipped with external droop CTs.

Installation and Adjustment

Mounting is via four screws with all terminals accessible from the front panel. Three trimpots—voltage, stability, and frequency—allow rapid commissioning. The regulator includes a remote voltage adjustment input for control from a distant panel.

Reliability and Standards

Built with high‑grade semiconductors and conformal‑coated PCBs, the AVC63-4 withstands humidity, vibration, and electrical noise. It complies with CE and RoHS standards, ensuring safe and environmentally responsible operation.

In conclusion, the Basler Electric AVC63‑4 automatic voltage regulator offers dependable, accurate voltage control with essential protection, making it a practical choice for generator operators worldwide.