17
I
NTERNAL
P
ROTECTIVE
D
EVICES OF THE
UPS
Located within the UPS are fuses (not accessible) in order to protect the rectifier input stage, the output stage of the inverter
and the batteries. The table below shows the values of the internal protection fuses.
NOTE: the UPS internal bypass line is not protected by fuses. We recommend installing an external protection device as
defined in the chapter
“E
XTERNAL
P
ROTECTION DEVICES
”
.
Internal protective devices
UPS Mod.
Input fuses
Battery fuses
Output fuses
5 kVA
2 x 25A GF (6.3x32)
80A aR
2 x 25A GF (6.3x32)
6 kVA
2 x 25A GF (6.3x32)
80A aR
2 x 25A GF (6.3x32)
8 kVA
80A aR [L1]
25A GF (6.3x32) [L2/L3]
80A aR
63A aR
10 kVA
80A aR [L1]
25A GF (6.3x32) [L2/L3]
80A aR
63A aR
SHORT CIRCUIT
If a fault occurs on the load, the UPS protects itself by limiting the value and the duration of the current supplied (short circuit
current). These values also depend on the UPS operating status at the time of the fault, these can either be (in the "
T
ECHNICAL
D
ATA
” table the protection characteristics and timings are described):
UPS in NORMAL OPERATION: the load is switched instantaneously to the bypass line: the input line is connected to
the output without any internal protection.
UPS in BATTERY OPERATION: the UPS protects itself by providing a higher current than the nominal one (see
paragraph “
T
ECHNICAL
D
ATA
”) and turns itself off after this time has elapsed.
BACKFEED
The UPS has internal protection against backfeed.
