Online USV 10000 3/1 XANTO S Series, User Manual

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S P E C I A L F U N C T I O N S
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XS20000_31_manual_ger_eng_it_V1.1.2.doc R. Kistler
5.3 Backfeed protection
The UPS system is prepared for a backfeed protection on the bypass
input.
If a dangerous backfeed voltage occurs, the contactor disconnects
the power supply from the bypass input of the UPS system. In addi-
tion, the "Backfeed alarm" is shown in the display of the UPS system.
An additional contactor must be installed for the backfeed protection
(see Figure 25). The contactor must be able to switch at least 60A
(XANTO S 10000 3/1) resp. 125A (XANTO S 20000 3/1).
Rückspeiseschutz nicht aktiv
Backfeed Protection not active
USV
UPS
M2
N
MC COIL OUT
MC COIL IN
Schütz
Magnetic
Contactor
Sicherung
2A Träge
Fuse
2A Slow
Bypass
Bypass
MAIN 2
R
ü
c
k
s
p
e
is
e
s
c
h
u
tz
-A
n
s
c
h
lu
s
s
B
a
c
k
fe
e
d
P
ro
te
c
ti
o
n
P
o
rt
K
le
m
m
le
is
te
T
e
rm
in
a
l
B
lo
c
k
Figure 25: Backfeed protection
To reset the "Backfeed alarm" the UPS system must be switched off
for several seconds.