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1.1
Major parts of the Mega V2 SA25
The Mega V2 SA25 includes the following sub-assemblies:
CONTROL PANEL
The Mega V2 SA25 control panel allows the user to:
• manage and control the Mega V2 SA25
• monitor the parameters of all sections of the Mega V2 SA25
RECTIFIER
The UPS includes a 3-phase rectifier with Power Factor Correction (PFC)
the ac input voltage to dc voltage, which feeds the inverter and also charges the UPS's battery.
INVERTER
The inverter receives dc current from the rectifier or from the batteries, and converts it to ac
current, which feeds the load devices. The 3-phase PWM inverter is connected to batteries by a
classic dc link.
STATIC SWITCH (ST/SW)
The static switch enables an automatic transfer of the load from the output of the inverters to an
alternate source whenever the inverter can no longer supply power to the load. The static switch
transfers current at high speed.
BATTERY
The Mega V2 SA25 battery bank is used as a backup in the event that the utility ac input fails.
The batteries are housed in an external cabinet next to the Mega V2 SA25 cabinet. Batteries are
charged by the rectifier, which supplies both the inverter and the battery charger.
The battery cabinet should be installed as close to the UPS as is practically possible.
Protect the batteries from moisture, dampness, and foreign substances.
The temperature of the battery's surroundings influences the batteries' useful lifetime.
2
In power factor correction, the power factor (represented as "k") is the ratio of true power (kwatts) divided
by reactive power (kvar). The power factor value is between 0.0 and 1.00. The greater the power factor, the
more efficient the device. A standard power supply has a power factor of 0.70-0.75, and a power supply
with PFC has a power factor of 0.95-0.99.
User Guide: MEGA V2 SA25, Release 1.5
Gamatronic Electronic Industries Ltd.
Table 1: Battery lifetime vs environmental temperature
E
NVIRONMENTAL
TEMPERATURE
20 °C
30 °C
40 °C
A
CHIEVABLE PERCENTAGE OF
'
BATTERY
S RATED LIFETIME
100 %
50 %
20 %
2
. The rectifier converts
3
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