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Marelli Motori S.p.A.
D-Vo digital regulator

D-Vo digital regulator

Product catalog summary

Overview: The Digital Voltage Regulator D-Vo is a microprocessor-based device designed to manage the electrical parameters of synchronous generators. It features a PWM power stage for exciter power supply and supports interfacing via Modbus protocol and proprietary software.

Key Features:

Compatible with generators ≥800 frame size and all HV generators.
Four operating modes: Automatic Voltage Regulation (AVR), Power Factor Regulation (PF), Reactive Power Regulation (VAR), and Field Current Regulation (FCR).
Configurable stability parameters and soft start with adjustable ramp in AVR mode.
Parallel operation with Reactive Droop Compensation.
Comprehensive generator protections including over-voltage, under-voltage, over-current, and loss of sensing.
Excitation limiters, watchdog, under-frequency limiter, and Fault Ride Through (FRT) detection and management.
Certifications: CE, UL, and VDE-AR-N-4110 grid code compliance.

Inputs and Outputs:

Voltage and current sensing for 1-ph or 3-ph generators and grid.
Three auxiliary analogue inputs and nine digital contacts (eight programmable).
PWM output with a maximum of 10A continuous and 20A forcing for 10 seconds.
Three configurable output relays for alarms and FRT.

Power Supply and Connection:

Supports single-phase and three-phase connections with various power sources including shunt, auxiliary winding, PMG, and separate AC/DC sources.
Voltage range: AC up to 250Vac and DC up to 300Vdc.

Regulation Accuracy:

AVR mode: ±0.25% of rated voltage.
FCR mode: ±2% of rated exciter current.
PF mode: ±0.005PF.
VAR mode: ±2% of rated power.
Voltage matching: ±2% of rated voltage.

Environmental Conditions:

Operating temperature: -30°C to +70°C.
Storage temperature: -40°C to +80°C.
Humidity: <90%.

Product Specifications:

EMC immunity and emissions compliant with IEC standards.
Tested for burst, surge, ESD, conducted and radiated immunities, and emissions.

User Interface:

USB and Ethernet ports for PC connection using proprietary or custom software.
Communication protocols: Modbus RTU (USB) and Modbus TCP/IP (Ethernet).

Contact Information: Marelli Motori S.p.A., Italy and Marelli Motori Asia Sdn Bhd, Malaysia.

Catalog excerpts

The new Digital Voltage Regulator D-Vo is an electronic microprocessor-based device which manages the operating electrical parameters of synchronous generators. The power supply to the exciter is through a PWM power stage. The D-Vo AVR can be interfaced and programmed using the standard Modbus communication protocol and a proprietary PC application supplied by Marelli Motori. The new D-Vo regulator is a standard feature of all generators >800 frame size and all HV (std) generators, it is also compatible with any Marelli Motori generator. J 4 Operating modes: o Automatic Voltage Regulation (AVR mode) o Power Factor Regulation (PF mode) o Reactive Power Regulation (VAR mode) o Field Current Regulation (FCR mode) J Stability parameters individually configurable (P.I.D.) or pre-defined standard parameterization J Soft start with adjustable ramp, in AVR mode J 1-ph or 3-ph generator voltage sensing J 1-ph or 3-ph generator current sensing J 1-ph grid voltage sensing J 3 auxiliary analogue inputs for remote setpoint control J Input for external potentiometer J 9 digital contacts (8 programmable) J Parallel function with similar generators operated with OUTPUTS Reactive Droop Compensation J Generator protections: o Field over-voltage J Excitation limiters (over- and under-excitation) J Watchdog J Under-frequency limiter J PWM output max. 10A continuous, 20A forcing for 10s J 3 configurable output relays for alarm and FRT The D-Vo is equipped with a Fault Ride Through (FRT) function that allows to detect the Low Voltage Ride Through (LVRT) or the High Voltage Ride Through (HVRT) and provides a dynamic support of reactive current during the event. FRT Management options available: J Standard J AVR mode J FRT detection and management J Certifications: ° CE

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USER INTERFACE y 1 USB port for connection to PC with Marelli Motori proprietary software or custom software y 1 Ethernet port for connection to PC with Marelli Motori proprietary software or custom software y Communication protocol: Modbus RTU (USB), Modbus TCP/IP (Ethernet) Marelli Motori S.p.A. Marelli Motori Asia Sdn Bhd Via Sabbionara 1 Lot 1-8, Persiaran Jubli Perak, 36071 Arzignano (VI) - Italy Seksyen 22, 40300 Shah Alam, (T) +39 0444 479 711 Selangor D.E. - Malaysia

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