NOTE !
This UPS is only designed to operate in a wye-configured electrical system with a
solidly grounded neutral.
The UPS cannot be operated from a mid-point or end-point grounded delta supply
source.
If the
Load
requires a
Neutral
, a
Bypass Source Neutral
MUST BE PROVIDED.
If no
Neutral Connection
is available with the
Bypass Input
(3-wire input + ground) and the
Load
does
not require a
Neutral
, solidly connect the
Output Neutral
of the UPS to ground with a ground
bonding jumper.
For single module applications install the ground bonding jumper directly at the UPS output.
Cable size for this connection shall be per
National Electric Code
and applicable local regulations,
but not less then AWG 1.
Attention
:
With this configuration,
Load
can only be connected phase-phase.
Absolutely no
Load Connection
permitted to the
Neutral of the output transformer
.
DO NOT install both a source
Neutral
and a bonding jumper!
In a
RPA Parallel System
configuration it is most
important to connect the
Neutrals
of the UPS
outputs together.
The output distribution cabinet must contain a
Neutral Bus
(see
Fig .3.8.3-2)
.
If no
Neutral Connection
is available with the
Bypass Input
(3-wire input + ground) and the
Load
does not require a
Neutral
, solidly connect the
Output Neutral
of the UPS to ground in the
Output
Distribution Cabinet
.
Wire Neutral Conductors
from the UPS to the
output distribution cabinet (common point of
connection) and solidly connect to ground with a
ground bonding jumper.
Fig. 3.8.3-2 RPA Parallel System
Cable size for the ground bonding jumper shall be per
National Electric Code
and applicable local
regulations, but not less then AWG 1.
Attention
:
DO NOT INSTALL both a source
Neutral
and a bonding jumper.
If the UPS is equipped with an
Input Bypass Transformer
, the
Secondary
of the transformer must be
wye-configured with
Neutral Solidly Grounded
.
The
Neutral of the Output Transformer
must be connected to the wye secondary winding of the
Bypass Transformer
.
eBoost™ Operation Mode
For installations intended to be operated in
eBoost™ Operation Mode
, the
Input Neutral Conductor
must be connected from the source of supply.
An
Input Neutral Conductor
MUST be pulled into the UPS.
Neutral
to ground bonding jumper shall NOT be installed in UPS installations intended to be
operated in
eBoost™ Operation Mode
.
Contact your
Service Center
, which will help you to find valuable solutions.
Modifications reserved
Page 26/40
OPM_SGS_ISG_M22_M30_2US_V010.doc
Installation Guide
SG Series 225 & 300 UL S2
