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Installation Guide
LP 33
/ 10 - 20 kVA
3.9 CONNECTIONS
WARNING !
The connections to and from the UPS must be executed by QUALIFIED
PERSONNEL ONLY.
Refer to the “
Safety prescriptions - Installation
” described on page 6.
3.9.1
Common input utility
Fig. 3.9.1-1 Common input utility
Common input utility
The UPS delivered in standard version has
common input utility
.
Only one input line (
F1
) supplies both
rectifier
and
bypass
input terminals.
Bear in mind that when the utility fuses are
opened there is a supply failure to the
rectifier
as well as to the
automatic bypass
and
manual
bypass
.
LPS33U_0
10-020_Co
nnection co
mmon_01
OFF
O FF
ON
ON
LOAD
X2
1 - INPUT
X1
UTILITY
L1-1
L2-1
L3-1
N1
L1
L2
L3
N2
Fig. 3.9.1-2 Power connections Common Input Utility
Input utility connection
L1-1
= Rec Bypass Phase A
L2-1
= Rec Bypass Phase B
L3-1
= Rec Bypass Phase C
N1
=
Neutral
utility
PE
= Earth
Output load connection
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.
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.