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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.
WIRE SIZE RANGE
AWG / kcmil
6 – 4
3 – 1
1/0 – 2/0
CONNECTION TYPE
(A) GROUNDING
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.
Modifications reserved
OPM_SGS_ISG_M22_M30_2US_V010.doc
Torque Specifications
Mechanical Compression Lugs
Input / Output / Battery
Lb - in
Nm
110
12.4
150
19.6
180
20.3
TERMINAL LUGS FOR FIELD WIRING CONNECTIONS
Provided for Terminal connections
RATING
Allowed cable sizes
1 x 350 MCM
WIRE SIZE RANGE
AWG / kcmil
3/0 – 200
250 – 350
500 – 750
Torque
Use only UL LISTED components.
325 Lb–in
Use two holed lug component.
See Fig. 3.8.2-1, Fig. 3.8.3-1 & Fig. 3.8.4-1
Lb - in
Nm
250
28.2
325
36.7
375
42.4
COMPONENT
Page 21/40
Installation Guide SG Series 225 & 300 UL S2
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