Safety Precautions; Technical Specifications - MarelliMotori MEC-20 Manuel Utilisateur

1. INTRODUCTION
This User Manual provides general installation and use information regarding the Marelli Motori regulator whose
code is reported on the cover and inside the document, mounted on Marelli Motori generator types indicated in
Chap. 3.
Before starting the generator and performing any type of regulation operation, carefully and completely read all of
the instructions contained in this manual.
IMPORTANT NOTE: This User Manual not intended to cover all of the possible application or installation
variations nor to provide data or information to support every possible contingency. The connection diagrams
provided with the generator, its Use and Maintenance Manual and any additional information provided by qualified
Marelli Motori technical personnel supplements and completes this manual.
In particular, the diagrams reported in this document provide only an example of the connection and operation
mode for the device; these do not cover all possible application cases and are not a substitute for the connection
diagrams normally provided with the generator.
If further application information becomes necessary, please contact Marelli Motori Service.
2.

SAFETY PRECAUTIONS

ATTENTION: DO NOT TOUCH THE CONTROL MODULE WHEN IT IS UNDER POWER.
When the control module is under power (or the machine is in rotation) the upper part of the
device (connection side) and all parts electrically connected to it contain lethal voltage. There
could be also components with high temperatures that are dangerous in the event of direct contact
during normal operation on the component module.
Any operation on the cabling and/or mechanical installation of the regulator must be
performed by qualified and informed personnel, with the generator halted and making sure
that a sufficient amount of time has passed for the regulator components to have cooled
down to a temperature that is not dangerous to personal safety.
Each calibration operation must be performed with the machine running without a load by
qualified and informed personnel using the proper tools to guarantee electrical safety (for
example, insulated screwdrivers) and wearing all of the necessary personal safety devices
(especially safety glasses and protective gloves).
Marelli Motori denies any responsibility for damage to the regulator, system or people, for loss of profit or money,
or for system shutdowns caused by the failure to observe the safety and/or installation/use instructions reported in
this User Manual.
3. APPLICATION
The M31FA600A MEC-20 voltage regulator is suitable for synchronous generators constructed by Marelli Motori.
NOTE: For information on compatibility with different sizes or series of synchronous generators other than those
indicated above, contact Marelli Motori Service.
4.

TECHNICAL SPECIFICATIONS

The M31FA600A voltage regulator is a micro-processor device with pulse-width modulation (PWM) output stage,
and can be calibrated using potentiometers. The circuit board is resin-bonded in order to maintain a high degree
of operational reliability even in difficult environmental conditions (high levels of humidity, dust, a salty
atmosphere) and in the presence of vibrations.
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