Eaton 93PM Series

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26 Eaton 93PM UPS 480V Three-Wire – 100 kW Frame Installation and Operation Manual 164000227—Rev 07

• 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 UPM needing service, decreasing critical load

protection.

• External parallel system wiring length should be in accordance with Figure 11, to ensure approximately

equal current sharing when in bypass mode.

Figure 11. 93PM External Parallel Wire Length

NOTE Required parallel system wiring lengthmustbe equal to ensure approximately equal current sharingwhen in Bypassmode. For

proper operationthe following must be true:

1A =2A=3A =4A

1B =2B=3B =4B

NOTE Anydifferenceinwirelengthwill result in decreased capacityofthe UPS system while on bypass. Forexample,a10% difference

between thelongest and shortest wire lengths will result inadecreaseinbypasscapacityof 10%.

BypassInput to UPSUnits

UPS1

Battery

UPS2

UPS3

UPS4

Output fromUPS Units

Battery

For external wiring recommendations, including the minimum AWG size of external wiring, see Table 4 or

Table 5. Wire sizes listed are for copper wiring only.

UPS Installation Plan and Unpacking

Eaton 93PM Series - Page 38