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Installation Guide
LP 33
/ 10 - 20 kVA
3.9.2 Separate
input utility (option)
Fig. 3.9.2-1 Separate input utility (option)
S
eparate input utility
On request, the UPS can be delivered for
separate input utility
.
Two independent lines (
F2
and
F3
) supply
separately the
rectifier
and the
bypass
inputs
With this configuration, when the
rectifier-input
fuses are opened, the
automatic bypass
and the
maintenance bypass
are supplied by the other
line.
OFF
OFF
ON
ON
LPS33U_01
0-020_Con
nection sep
arate_01
LOAD
L1
-1
L2-1
L3-1
N1
L1
L2
L3
N2
RECTIFIE
R
LOAD
X2
INPUT
1-
BYPASS
INPUT
2-
L1-2
L2
-2
L3
-2
X1
Fig. 3.9.2-2 Power connections Separate Input Utility
Rectifier input utility
L1-1
= Rectifier Phase A
L2-1
= Rectifier Phase B
L3-1
= Rectifier Phase C
N1
=
Neutral
utility
PE
= Earth
Bypass input utility
L1-2
= Bypass Phase A
L2-2
= Bypass Phase B
L3-2
= Bypass Phase C
(N1
= Neutral
utility
)
PE
= Earth
Output load
L1
= Load phase A
L2
= Load phase B
L3
= Load phase C
N2
=
Neutral
load
PE
= Earth
load
Max. rating
X1
and
X2
terminals:
4 AWG
(25mm
2
)
For UPS correct operation, the input utility phase rotation must be clock-wise.
Neutral of
rectifier
input and neutral of
bypass
input must be coming from the
same input bar.
Inside the UPS, all neutrals
N1
and
N2
are connected together.
Connect wire to the
Terminals
using appropriate tools and appropriate torque.
Torque specification for
Input / Output
and
DC
power connections on
Terminals
:
Section 3.8.1
.
This UPS is designed to operate in a wye-configured electrical system with a
solidly grounded neutral.
If the UPS is equipped with an input transformer, the secondary of the
transformer must be wye-configured with neutral solidly grounded.
