The R 181 is an AVR designed for ARES or ARCM type compound excitation alternators.

The R 181 is a transistor-controlled AVR. The measured voltage is filtered and rectified.It is not affected by voltage variations caused by non-linear loads.

It is totally sealed with an elastomer which protects it from environmental stresses.

R 181 AVR function:

- AVR accuracy +/- 1%

- Underspeed protection

- LAM load shedding system

- Parallel operation between alternators by voltage quadrature droop

- External potentiometer connection wires, for voltage adjustment (470 ohms: voltage range

+/- 5% - 3 W, or 1000 ohms: voltage range +/- 10% - 3 W)

- Wires for CT parallel operation output 1 A - 2.5 VA

- 220 V or 400 V power supply

- 5 VA voltage sensing isolated via transformer