Eaton 9390IT Installation And Operation Manual

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POWER WIRING INSTALLATION NOTES110106BDESCRIPTION:DATE:DRAWING NO: SHEET:REVISION:UPM 2BatteryBypass inputs to UPMsUPM 1BatteryUPM 3BatteryUPM 4BatteryOutputs from UPMs1A2A3A4A1B2B3B4B23 of 23164201603-6INSTALLATION INFORMATIONEaton®9390 UPS (20–80 kVA) and 9390IT (20-40 kVA) Installation and Operation Manual 164201603 Rev 4 www.eaton.com/powerquality A-3534. Required parallel system wiring length should be in accordance with the following rule, asreferenced to the diagram below, to ensure approximately equal current sharing when inStatic Bypass mode:(Total length of 1A + 1B)  (Total length of 2A + 2B)  (Total length of 3A + 3B) (Total length of 4A + 4B)This rule has a tolerance of approximately 10% for the combined input and output wirelengths.If installing only two UPMs in a fully redundant system, this requirement is no longerrequired, as each UPM is capable of supporting the full bypass requirement. However, thiswould preclude future expansion.