POWER WIRING INSTALLATION NOTES
121504
C
164201554---5
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 (30)
2A (35)
3A (40)
4A (45)
1B (25)
2B (20)
3B (15)
4B (10)
15 of 15
NOTE:
Wire lengths in the diagram and
formula are in feet and are for
example only.
Installation Information
A-26
EATON
Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual
S
164201554 Rev E
powerware.com
32.
Required parallel system wiring length must be in accordance with the following formula,
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)
(30 + 25)
≅
(35 + 20)
≅
(40 + 15)
≅
(45 + 10)
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.
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