Gamatronic Electronic Industries Ltd.
4
CENTRIC User Guide, Release 0.3
1.2
System controller
The
Centric
system controller has three purposes:
•
Controls and monitors the operation of the
Centric
according to the user's commands.
•
Collects and summarizes data from all sections of the UPS.
•
Manages communication with external computers for data transfer and operation.
The
Centric
can operate without the system controller but with reduced functionality.
1.3
UPS module (25 kVA / 25 kW)
The UPS module is the core of the
Centric
, which consists of from one to ten identical internal
modules operating in parallel. The number of UPS modules is fixed at the time of manufacture
and depends on the user's capacity requirements.
Each UPS module includes a 3-phase charger with PFC (power factor correction) and a 3-phase
PWM (pulse-width modulation) inverter connected to batteries by a classic dc link.
1.4
Static switch module
The centralized hybrid static switch enables an automatic transfer of the load from the output of
the inverters to an alternate source – the ac mains, for example – when the inverter is unable to
supply sufficient power to the load (for example, in the event of an overload, or an inverter
failure). The static switch transfers high currents at very high speed; a typical transfer time is 3
ms.
1.5
Battery
The
Centric
battery bank provides backup power to the UPS and its load devices in the event
that the utility ac input fails. The batteries are housed in an external cabinet adjacent to the
Centric
. The batteries are charged by the rectifier that 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.
Table 1: Battery lifetime vs environmental temperature as per Eurobat
E
NVIRONMENTAL
TEMPERATURE
A
CHIEVABLE PERCENTAGE OF
BATTERY
'
S RATED LIFETIME
20 °C
100 %
30 °C
50 %
40 °C
20 %