32
TO LOAD
TO UTILITY
Main Maintenance
Bypass Switch
Main Input
Breaker
Main Output
Breaker
M
ain
te
na
nc
e B
yp
as
s f
or
P
ar
all
el
U
P
S
2 O
utp
ut
B
re
ak
er
U
P
S
1 O
utp
ut
B
re
ak
er
U
P
S
3 O
utp
ut
B
re
ak
er
U
P
S
1 I
np
ut
B
re
ak
er
U
P
S
2 I
np
ut
B
re
ak
er
U
P
S
3 I
np
ut
B
re
ak
er
Fig.8-3 Parallel installation diagram
7) The distance between the UPS in parallel and the breaker panel is required to
be less than 20 meters. The difference between the wires of input and output
of the UPS is required to be less than 20%.
8) Do not switch on the output breaker of each UPS, switch on the input breaker
of the each UPS, the UPS should work in bypass with output, observe their
display to check if there are any warning or fault information, measure the
output voltage of each UPS separately to check if the voltage difference
between them is less than 1V. If the difference is more than 1V, check the
wiring.
9) Press the button of one UPS, each UPS would start to turn on, all the
UPS would transfer to the Line mode together. Measure the output voltage of
each UPS separately to check if the voltage difference between them is less
