21
1
5
9
3
7
11
2
6
10
4
8
12
13
14
7 – Wiring
(continued)
7-8 AC Input/Output Wiring (Parallel UPS – Single Input)
Parallel Redundancy Warnings:
The total input cable length must be equal to the total
•
output cable length in order to prevent unbalanced load
sharing between two UPS systems under reserve mode
(i.e. IP1 + OP1 = IP2 + OP2; deviation must be <10%).
Parallel redundancy only supports 2 UPS systems (1+1
•
redundancy ). Do not attempt to link more than two UPS
systems via parallel redundancy.
The UPS systems must have the same rating and capacity
•
for parallel redundancy installation. Attempting to link
dissimilar UPS systems will damage the UPS systems
and create a serious risk of personal injury and property
damage.
Follow the steps in
•
Section 7-7
, wiring the UPS systems as shown
in the diagram.
Connect the included parallel redundancy cable
•
A
to the parallel
redundancy port
B
of each UPS system.
1
2
2
O/P
Main I/P
Parallel Port
UPS1
O/P
Main I/P
Parallel Port
UPS2
Parallel Cable
Load
AC I/P
IP1
IP2
OP1
OP2
1
B
B
A
