Distributed Bypass Power Wiring Preparation; Inspecting And Unpacking The Ups Cabinets - Eaton Power Xpert 9395 Installation And Operation Manual

UPS Installation Plan and Unpacking
The maximum distance between the REPO and the UPS cannot exceed 150 meters (500 feet).
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Alarm relay contacts have a maximum current rating of 5A and a switched voltage rating of 30 Vac and 28
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Vdc.
Alarm relay wiring should be a minimum of 22 AWG.
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NOTE
3.2.7

Distributed Bypass Power Wiring Preparation

NOTE
Read and understand the following notes while planning and performing the installation:
All distributed bypass UPS rectifier inputs must come from one source and all bypass input feeds must
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come from one source.
All UPSs in the distributed bypass system must contain the same number of UPMs. Mixed UPS kVA ratings
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are not permitted.
Distributed bypass UPS input wiring size requirements and output wiring size requirements from the UPSs
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to the tie cabinet or distribution panel are the same as listed in Table 3-6 to Table 3-17.
The 9395P-300 480V unit is designed for operation on a ground wire source of supply. There is no additional
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connection point for a neutral conductor. The output of this UPS will not directly support phase to neutral
loads.
MOBs with dual auxiliary contacts are to be provided by the customer. Table 3-26 lists the recommended
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rating for the MOBs.
The tie cabinet is provided by the customer and must contain Module Output Breakers (MOBs) with dual
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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 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.
See Figure 4-6 for Distributed Bypass Wiring Length.
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3.3

Inspecting and Unpacking the UPS Cabinets

The UPS cabinet is palletted separately for shipping. The cabinet is shipped bolted to a wooden pallet and
protected with outer protective packaging material.
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3-34 Eaton Power Xpert
NOTE On all 9395P-300 models that will be fed by a site generator at any time it is
recommended to have an "On Generator" sensing input connected and proven
functional. This allows the UPS to optimize its operation with the generator. This
function includes reduced input current and battery current limits, slower walk-in to
ease the load step on the generator initially, and HIGH ALERT mode for ESS and
VMMS operation.
HIGH ALERT mode is desired because any loads with a leading power factor will
not be seen by the generator. Rectifier operation will be much softer while on
generator thereby increasing overall system stability.
For full-rated operation of a Distributed Bypass System when in Bypass or ESS
mode, the line frequency impedance of all conduction paths must be equal when
assessed from the point where the Bypass Power Source connects to the System
Switchgear to the point where the Common Load connects to the System
Switchgear.
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9395P-300 (300kVA, 300kW) UPS Installation and Operation Manual P-164000563—Rev 04 www.eaton.com/powerquality