Eaton Powerware 9390 Installation And Operation Manual page 181

33.
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.
Bypass inputs to UPMs
1A
2A
3A
4A
EATON Powerware
Battery
Battery
Battery
Battery
DESCRIPTION:
DRAWING NO:
REVISION:
® 9390 UPS (20–80 kVA) Installation and Operation Manual
UPM 1
UPM 2
UPM 3
UPM 4
POWER WIRING INSTALLATION NOTES
164201603-5
DATE:
B
S
164201603 Rev 2 www.powerware.com
INSTALLATION INFORMATION
Outputs from UPMs
1B
2B
3B
4B
SHEET:
23 of 23
110106
A-33