Eaton Power Xpert 9395 550/275 Installation And Operation Manual page 59

UPS Installation Plan and Unpacking
2. Internally generated reference which avoids ground current. By locating the center reference inside
the three phase conductors, the relationship between the UPS source and the UPS output is
maintained. This is an internal UPS function and requires no additional work on the part of the installer
or user.
SINGLE HIGH IMPEDANCE GROUND SOURCE - In North American installations, the neutral conductor from
the high impedance ground source of supply CANNOT be used. DO NOT bond the inverter center point (E12)
to ground: this is an internal UPS function and requires no additional work by the installer or user.
DUAL HIGH IMPEDANCE GROUND SOURCE - In North American installations, the neutral conductor from the
high impedance ground source of supply CANNOT be used. DO NOT bond the inverter center point (E12) to
ground: this is an internal UPS function and requires no additional work by the installer or user. Please contact
the Eaton help desk listed in Chapter 1 for additional guidance regarding dual high impedance ground sources.
When selecting the most appropriate grounding scheme for your application, consider items such as:
– Ground fault detector settings
– Site specific specifications and requirements
– Local codes and regulations
• MOBs with dual auxiliary contacts are to be provided by the customer.
rating for the MOBs.
• The tie cabinet must contain Module Output Breakers (MOBs) with dual auxiliary contacts for control of
the system. Without dual auxiliary MOBs, UPMs are not allowed to go to bypass individually during
servicing. All UPMs will go to bypass instead of the just the UPM needing service, decreasing critical load
protection. With dual auxiliary MOBs, one UPM can be bypassed while the remaining UPMs support the
load as long as the remaining UPMs have the capacity to do so.
3 3 . . 3 3 I I n n s s p p e e c c t t i i n n g g a a n n d d U U n n p p a a c c k k i i n n g g t t h h e e U U P P S S C C a a b b i i n n e e t t
The UPS cabinet is palleted separately for shipping. The cabinet is shipped bolted to a wooden pallet (see
Figure 10) and protected with outer protective packaging material.
The UPS cabinet is heavy (see
cabinet may tip and cause serious injury.
38 Eaton Power Xpert 9395 UPS Installation and Operation Manual 164201716—Rev 14
Table 2). If unpacking and unloading instructions are not closely followed, the
Table 16 lists the recommended