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MASTERYS GP4 60-160 kVA - Ref.: IOMMASGPXX07-EN 05
10. OPERATING MODES
10.1 On line mode
A special feature of the UPS is the ONLINE double conversion in conjunction with low distortion mains power absorp-
tion. In ON LINE mode, the UPS can supply a voltage that is fully stabilised in frequency and amplitude, regardless of
any interference in the mains power supply, within the most stringent classification of UPS regulations.
ON LINE operation provides three operating modes according to mains and load conditions:
• Inverter mode
This is the most frequent operating condition: energy is drawn from the primary mains power supply and converted
and used by the inverter to generate the output voltage to power the connected loads.
The inverter is constantly synchronised in frequency with the auxiliary mains to enable load transfer (due to an over-
load or inverter shutdown) without any break in the power supply to the load.
The battery charger supplies the energy required to maintain or recharge the battery.
• Bypass mode
In the event of inverter failure, the load is automatically transferred onto the auxiliary mains without any interruption in
the power supply.
This procedure may occur in the following situations:
- in the event of a temporary overload, the inverter continues to power the load. If the condition persists, the UPS
output is switched on to the auxiliary mains via automatic bypass. Normal operation, which is from the inverter,
returns automatically a few seconds after the overload disappears.
- when the voltage generated by the inverter goes outside the limits due to a major overload or a fault on the
inverter.
- when the internal temperature exceeds the maximum value allowed.
• Battery mode
In the event of a mains failure (micro interruptions or extended power cuts), the UPS continues to power the load
using the energy stored in the battery.
10.2 High ef
fi
ciency mode
The UPS has a selectable, programmable economy operating mode (ECO MODE) that can increase overall efficiency
by up to 99% for energy saving purposes. If the power supply fails, the UPS will automatically switch onto the inverter
and continue to supply power to the load by drawing energy from the battery.
This mode does not provide perfect stability in frequency and voltage like the ON LINE mode. Therefore the use of
this mode should be carefully evaluated according to the level of protection required by the application. With the
optional board Net Vision specific daily or weekly time intervals can be selected and programmed to power applica-
tions directly from the auxiliary mains.
ECO MODE operation provides very high efficiency, since the application is powered directly from the auxiliary mains
via the automatic bypass under normal operating conditions.
To activate follow the correct procedure in the control panel.
