3.8 WIRING CONNECTION
WARNING!
UPS installation and connection must be performed by QUALIFIED SERVICE
PERSONNEL ONLY.
3.8.1 Power connections
Input/output and DC connections are provided with terminal blocks.
Please refer to chart for torque specifications.
Carefully read the following recommendations before proceeding:
•
Ensure that the AC and DC external isolators are OFF and locked to prevent their inadvertent
operation.
•
Do not close any external isolators prior the commissioning of the equipment.
•
The preferred power cable entry location for installation purposes is from the right side of the UPS,
either top or bottom.
In case of cable entry from the top of the cabinet, remove the cover plate fitted on the roof and
provide for a suitable isolated protection cover.
In case of cable entry from the bottom remove cover plate and perform the same procedure.
•
If the UPS is installed in such a way that the accessibility to the right side panel is reduced, field
wiring connections can be made from the front side by removing the front right side panel
protection cover/panel ( E ) as indicated in
Fig. 3.8.1-1
be advised that installation performed from
the front position will give the installer reduced visibility to the terminal lugs.
•
The input/output cables must be connected in clockwise phase rotation for both
Bypass
and
Rectifier Input Terminals
if separate, taking care to avoid risk of short circuit between different poles.
•
The grounding and neutral connection of the electrical system must be in accordance with local
regulations.
•
In case of additional cabinets containing batteries, input/ output transformers, etc, their ground
terminals must be connected to the UPS main ground terminal.
•
Once the power cables have been connected, re-install the internal safety shields and close the
cabinets by re-installing all external panels.
Torque Specifications
Mechanical Compression Lugs
Input / Output / Battery
WIRE SIZE RANGE
AWG / kcmil
Lb - in
Nm
WIRE SIZE RANGE
AWG / kcmil
Lb - in
Nm
6 – 4
110 12.4
3/0 – 200
250 28.2
3 – 1
150 19.6
250 – 350
325 36.7
1/0 – 2/0
180 20.3
500 – 750
375 42.4
TERMINAL LUGS FOR FIELD WIRING CONNECTIONS
Provided for Terminal connections
CONNECTION TYPE
RATING
(A) GROUNDING
Allowed cable sizes
Torque
COMPONENT
3 lugs in total are used for each unit
•
One is used for
Input Grounding
•
One is used for
Output Grounding
•
One is used for
Battery Cabinet
Grounding
Terminals Lugs are secured to
chassis by means of two bolts.
1 x 350 MCM
325 Lb–in
Use only UL LISTED components.
Use two holed lug component.
See
Fig. 3.8.2-1
,
Fig.
3.8.3-1 &
Fig.
3.8.4-1
Modifications reserved
Page 21/40
OPM_SGS_ISG_M22_M30_2US_V010.doc
Installation Guide
SG Series 225 & 300 UL S2
