The Datakom AVR-8-380 is an advanced electronic voltage regulator that enables an alternator to produce a stable and constant output voltage. The device has an open, resin-potted housing, which makes it extremely resistant to vibration and extreme operating conditions, and it is mounted directly in the alternator terminal box.
The regulator measures the phase-to-phase voltage of the alternator and automatically adjusts the DC voltage applied to the excitation winding in order to achieve the desired output voltage. Thanks to the built-in under-frequency protection, the device reduces the output voltage in proportion to the frequency drop below a manually adjustable threshold. The nominal frequency can easily be changed between 50 Hz and 60 Hz using a simple push-on connection.
The AVR-8-380 also features sensing loss protection, which de-energizes the excitation and protects the windings in case the voltage sensing input is interrupted. The device supplies the excitation system directly from the generator output, and the minimum residual voltage required for start-up is 4 V AC.
The output stage uses a half-wave thyristor output with a freewheeling diode, which enables stable and reliable operation with all brushless alternators. The regulator also has stability adjustment, as well as the option of external (analog) voltage adjustment in the range of ±3 V.
Thanks to the droop input, the device supports parallel operation with other generators, and additional protections against overload, high temperature, and sensing loss guarantee long-lasting and safe operation.
| Feature | Description |
|---|---|
| Voltage sensing type | Phase-to-phase (no neutral connection required) |
| Output type | Half-wave thyristor output with freewheeling diode |
| Output current | Nominally limited – overload protection |
| Output voltage | Automatically regulated (DC excitation) |
| Minimum residual voltage for start-up | 4 V AC |
| Operating frequency | 50 / 60 Hz (selectable) |
| Voltage adjustment | Built-in and external (±3 V analog input) |
| Stability adjustment | Yes |
| Droop input (for parallel operation) | Yes |
| Under-frequency protection | Yes, with manually adjustable threshold |
| Overload protection | Yes |
| High temperature protection | Yes |
| Sensing loss protection | Yes |
| Excitation supply | Directly from generator terminals |
| Enclosure | Open, resin-potted |
| Vibration resistance | High – no moving parts |
| Compatibility | All brushless alternators |