62 Appendix 1 Operation Guide For UPS Parallel Power Distribution
Liebert
®
ITA 10kVA UPS User Manual
Appendix 1 Operation Guide For UPS Parallel
Power Distribution
Taking 1 + 1 parallel for example, the schematic diagram of the power distribution is shown in Figure 1.
1#UPS Battery cabinet string
Cabinet
1# UPS
MCB 1
MCB 2
Battery
cabinet 1
BAT -
Battery
cabinet 2
Battery
cabinet 1
Battery
cabinet 2
B
at
te
ry
po
rt
AC input
AC output
B
at
te
ry
po
rt
AC input
AC output
N
U
V
W PE
L
PE
N
N
U
V
W PE
L
PE
N
A
C i
np
ut
A
C ou
tp
ut
P
E
BYPASS
U
V
W
N
N
L
PE
LO
A
D
po
w
er
gr
id
inp
ut
BAT +
BAT -
BAT +
BAT
－
BAT
＋
BAT -
BAT +
BAT_PE
Parallel POD
2# UPS
BAT -
BAT +
BAT -
BAT +
BAT_PE
BAT -
BAT +
BAT-
BAT+
Note: To ensure that only one point of the whole system is earthed, the mains PE
has been connected with the BAT_PE through the cables in the UPS; The cable BAT_PE
must be reliably connected to the metal enclosure of the battery cabinet, and the wiring of
the BAT + and the BAT - should be laid side by side and be the same direction.
2#UPS Battery cabinet string
Me
ta
l e
nc
los
ur
e
of
ba
tte
ry
c
ab
ine
t
Figure 1 Schematic diagram of power distribution
