Instruction manual

POWER WIRING INSTALLATION NOTES
110106B
DESCRIPTION:
DATE:
DRAWING NO: SHEET:
REVISION:
UPM 2
Battery
Bypass inputs to UPMs
UPM 1
Battery
UPM 3
Battery
UPM 4
Battery
Outputs from UPMs
1A
2A
3A
4A
1B
2B
3B
4B
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164201603-6
INSTALLATION INFORMATION
Eaton
®
9390 UPS (20–80 kVA) and 9390IT (20-40 kVA) Installation and Operation Manual S 164201603 Rev 4 www.eaton.com/powerquality
A-35
34. Required parallel system wiring length should be in accordance with the following rule, as
referenced to the diagram below, to ensure approximately equal current sharing when in
Static 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 wire
lengths.
If installing only two UPMs in a fully redundant system, this requirement is no longer
required, as each UPM is capable of supporting the full bypass requirement. However, this
would preclude future expansion.