PAGINA
GCM02-MT-ING4 NEW.doc c/02 04/03/2003 ITA Page 6 of 57
1.2 OPERATIONAL PRINCIPLE
HOW A STAND-BY GENERATOR UNIT WORKS
Fig. 1 illustrates the system components that consist of a public mains R, a generator unit G-M, a QGE command and control panel
with a built-in mains contact maker CR, a generator unit contact maker CG and the M02 module that controls the system.
Supposing that the mains R is within the normal limits, the CR mains contact maker is closed therefore the
utility is powered from the mains. The M02 module controls the R mains and if there should be a drop in
voltage, a phase should be missing or the phases should be dissymmetrical, the control panel:
1. opens the CR mains contact maker;
2. starts the G-M generator unit, which when the established operating conditions are reached, the M02
module closes the CG contact maker that then powers the utility from the generator unit G;
NOTE: When running, the M motor and G generator are safeguarded against possible anomalies, which if
encountered, cause the generator to stop immediately and the cause for the alarm is saved and displayed (i.e.
low oil pressure, overload and so on);
3. When the R mains is restored within the normal limits, the M02 after an adjustable delay, opens the
contact maker of the CG generator and one second later closes the CR contact maker, thus powering the
utility from the mains again;
4. The generator continues to run for at least another minute to cool down after which it stops automatically;
NOTE: Even when the generator is stopped, some safety devices relating to the fuel and water level are
enabled and if an anomaly is detected an alarm status is triggered. The switching of the mains/generator is
also constantly controlled and if there should be an overload on the mains contact maker an alarm buzzer is
triggered.
To ensure the perfect efficiency of the generator a battery charger automatically holds the battery perfectly
efficient. An automatic fuel filling system constantly keeps the correct level in the daily tank. A pre-heating
system maintains the motor at the ideal temperature so that it is ready to start whenever necessary.
G
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