Description Of AVRs MarelliMotori
Marelli Motori’s advanced AVRs (Automatic Voltage Regulators) are made to control and maintain an electric generator’s output voltage. These AVRs’ primary job is to keep the voltage steady and constant in spite of variations in load or operating circumstances.

In many situations where a steady voltage is necessary to guarantee generator operation and safeguard other electrical equipment, these products are invaluable. Gas turbines, diesel-powered generators, and other power generation devices can all employ Marelli Motori AVRs.
Analogue Voltage Regulators
Marelli Motori analogue regulation systems are suitable for low and medium voltage machines. The regulators are fully insulated in order to mantain high reliability also with severe ambient conditions (high level of humidity, dust, salt atmosphere) and in case of high vibration level. The AVRs can work both for single and three phase operations.
Digital Regulators
Marelli Motori digital regulation systems provide functional and reliable solutions for the excitation control of synchronous generators. These highly integrated and robust AVRs are fully configurable and guarantee easy commissioning, monitoring and maintenance by user-friendly proprietary HMI (human-machine interface) software.
A wide range of built-in control functions, protections and operating modes make Marelli Motori digital AVRs flexible and suitable for a wide range of applications, including marine, hydro and cogeneration. The new D-Vo regulator is a standard feature on all our generators ?800 frame size and all HV (std) generators, but it is also compatible with any Marelli Motori generator.
Model Mark VX
Frame size: 160 ÷ 250
Technology: ANALOGUE
Part number: 11000013
Compliance: CE and UL unlisted
- Power supply voltage: 170 ÷ 277 Vac @ 50/60 Hz
- Power supply source: Auxiliary windings, mains
- Voltage build-up: 5 Vac
- Voltage sensing type: 1-phase
- Voltage sensing range: 170 ÷ 277 Vac
- Maximum continuative field current: 0 ÷ 5 Adc
- Maximum forcing field current: 0 ÷ 8 Adc
- Maximum field voltage: 100 Vdc
- Field resistance: 8 ? ÷ 20 ?
- Regulation accuracy from no load to full load: ±0.5 %
- Accuracy with ±4% engine governing: ±1 %
- Thermal Drift: ±0.5 %
- Response time: 1 cycle
- Operating temperature: -30°C ÷ +70°C
- Storage temperature: -40°C ÷ +80°C
- Interface: Potentiometers
- Voltage remote control: Arrangement
- Radio interference suppressor: Internal
- Under-frequency limiter
- Internal fuse, replaceable
- External potentiometer: 100 k? – 1 W
- External DC voltage signal (0 / +10 Vz
- L: 160 mm
- B: 93.6 mm
- K: 137 mm
- H: 45 mm
- D: 5.5 mm
- Weight: 370 g
Source: www.marellimotori.com
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