Page 34 - catalogue-2024

Alternator Voltage Regulators

Digital Voltage Regulator / AVR-10-D

DATAKOM AVR-10-D is a microprocessor controlled digital voltage regulator designed for synchronous brushless alternators. It
features high static and dynamic voltage stability in a compact and low-cost package. The device has open chassis, resin molded
design and is intended to be mounted inside the
alternator’s terminal box.

The output stage of the device is a Half Wave thyristor output associated with a freewheeling diode.The unit does not include
moving parts; therefore, it is able to operate in highly vibrating environments.
The unit regulates the alternator voltage by adjusting the DC voltage applied to the excitation winding. It uses digital PID algorithms
for the maximum precision and the best dynamic response.
The unit supports both AREP, PMG or shunt regulated alternators. It has separate inputs for voltage measurement and the
excitation supply.

The internal supply is derived from excitation supply inputs and has an operating range of 35- 300VAC. Thus, the output voltage
regulation range is as wide as 42-277VAC Ph-N (73- 480VAC Ph-Ph) in SHUNT mode and 15-277V in AREP or PMG modes.
The required minimum residual voltage for buildup is 3 VAC.
The standard unit comes ready for flawless operation with most alternators; however, it also provides a complete set of
programmable parameters allowing precise adaptation to the alternator and the application in question.

The device has 3 phase network connection and measures both phase-to-neutral and phase-tophase voltage of the alternator.
It is also able to handle single phase alternators.

The unit continually monitors the alternator frequency and provides a LAM (load acceptance module) function (also known as
knee-function) for protection against overloading of the engine. When the engine rpm drops, the alternator voltage is
proportionally reduced in order to protect the diesel engine from stopping.

The unit provides a soft-start feature preventing excessive excitation currents and voltage oscillations at startup phase.
The sensing loss protection feature limits the excitation current and protects the windings if no voltage is present on the sensing
inputs after 10 seconds.

The unit continually measures the excitation current and the heatsink temperature, providing protection against overexcitation
and overheating.

The unit supports multiple gensets parallel operation. Both ±3V and 0-10V analog load sharing inputs are provided.

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