iNTRODUCTION – MEC-100 SERIES The Marelli Motori Digital Regulation Systems included in MEC-100 series are microprocessor-based electronic devices for the set-up and monitoring of the excitation system of Marelli generators with frame size ranging between 400 and 800. The configurability of the system and control parameters makes the MEC-100 series regulators flexible and suitable for a wide range of applications. These regulators are completely resin-bonded and isolated to keep a high operating reliability even in difficult working conditions (high levels of humidity, dust, salty atmosphere) and in presence of vibrations. 1.2. MEC-100 SERIES CHARACTERISTICS 1.2.1. Functions
Four operating modes: • Automatic voltage regulation (AVR Mode). • Power Factor Regulation (PF Mode). • Reactive Power Regulation (VAR Mode). • Field Current Regulation (FCR Mode).
Stability parameters which can be individually set (P.I.D.) or predefined standard parameterizations.
Soft start with a ramp which can be set, in AVR Mode.
Generators parallel operation by means of Reactive Droop Compensation.
Generator protections: • Field over-voltage. • Field over-current. • Generator over-voltage. • Generator under-voltage. • Generator over-current. • Loss of voltage sensing. • Diode Failure Monitoring.
Excitation limiters (over-excitation and under-excitation).
Under-frequency limiter.
Internal Inrush Current limiter. 1.2.2. Inputs
Generator voltage single-phase or three-phase sensing.
Current sensing on single phase (1A or 5A).
Network voltage single-phase sensing.
2 auxiliary analogue inputs (4-20mAdc)