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3.9
WIRING CONNECTION
WARNING!
UPS installation and connection must be performed by QUALIFIED SERVICE
PERSONNEL ONLY.
3.9.1 Power connections
Carefully read the following recommendations before proceeding:
•
Ensure that the AC and DC external circuit breakers are OFF and locked out to prevent their
inadvertent operation.
•
Do not close any external circuit breakers 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.
To facilitate the terminations, remove the right side panel in order to access the input/output bus
bars
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 (A) as indicated in Fig. 3.9.1-1.
Be advised that installation performed from the front position will give the installer reduced
visibility.
•
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.
•
External Bypass must match Bypass Input Phasing.
•
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.
UPS rating
SG Series 750
SG Series 750 T12
Modifications reserved
OPM_SGS_ISG_M75_M75_2US_V010.doc
Torque Specifications
Lugs bolted to Buss Blades
Input / Output / Neutral / Battery and GND
BOLT Size
(mm / inches)
M12 (1/2")
BOLT Torque
(Lb-in)
428
Installation Guide SG Series 750 UL S2 & SG Series 750 T12 UL S2
BOLT Torque
(N-m)
48
Page 28/49
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