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3)
3) Turn
Turn off
off the UPS
the UPS systems that
systems that are running.
are running. After
After all of
all of the
the
running UPSs transfer to the Bypass mode, remove the
running UPSs transfer to the Bypass mode, remove the
maintenance cover board of each UPS and set the
maintenance cover board of each UPS and set the
maintenance switch from “UPS” to “BPS”, then cut off the input
maintenance switch from “UPS” to “BPS”, then cut off the input
breaker of each UPS.
breaker of each UPS.
4)
4) If the
If the UPS system
UPS system that
that is running
is running is a
is a stand-alone
stand-alone UPS, you
UPS, you
need to remove the short connection wire between JP1 and JP2
need to remove the short connection wire between JP1 and JP2
on the terminal block.
on the terminal block.
5)
5) Remove the
Remove the cover
cover board o
board of the
f the parallel port
parallel port on
on the new
the new UPS,
UPS,
push one end of the parallel cable into the slot of the parallel kit
push one end of the parallel cable into the slot of the parallel kit
and screw up the connector; screw the cover board of the
and screw up the connector; screw the cover board of the
parallel port back again.
parallel port back again.
6)
6) Remove the
Remove the maintenance
maintenance cover
cover board
board of
of the
the new
new UPS
UPS and
and set
set
the maintenance switch from “UPS” to “BPS”.
the maintenance switch from “UPS” to “BPS”.
7)
7) Turn
Turn on
on the
the battery switch
battery switch and
and the
the external input
external input breaker of
breaker of the
the
new UPS; measure the difference voltage between the output
new UPS; measure the difference voltage between the output
line wires of new UPS and the parallel system to check if the
line wires of new UPS and the parallel system to check if the
voltage difference between them is less than 1V. If the
voltage difference between them is less than 1V. If the
difference is less than 1V, close the output live wire breaker. If
difference is less than 1V, close the output live wire breaker. If
the difference is more than 1V, check if the wirings are
the difference is more than 1V, check if the wirings are
abnormal.
abnormal.
8)
8) Remove the
Remove the cover
cover board
board of th
of the
e parallel
parallel port
port located
located on
on the
the UPS
UPS
which has transferred to the maintenance bypass and push the
which has transferred to the maintenance bypass and push the
other end of the parallel cable into the slot of the parallel kit and
other end of the parallel cable into the slot of the parallel kit and
fasten the connector. Screw the cover board of the parallel port
fasten the connector. Screw the cover board of the parallel port
back again.
back again.
9)
9) Turn
Turn on
on the
the input breakers
input breakers of a
of all of
ll of the
the UPSs (including
UPSs (including the
the new
new
UPS) in the parallel system. After all of the UPSs transfer to the
UPS) in the parallel system. After all of the UPSs transfer to the
Bypass mode, screw the maintenance cover board back again.
Bypass mode, screw the maintenance cover board back again.
10) Turn on each UPS in turn and observe their display. Make sure
10) Turn on each UPS in turn and observe their display. Make sure
that each UPS displays normal and all the UPSs transfer to the
that each UPS displays normal and all the UPSs transfer to the