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Using a multimeter, check the exact relationship of connections between the UPS phases, as
follows:
MAIN INPUT
L1 input UPS1 = L1 input UPS2.
L2 input UPS1 = L2 input UPS2.
L3 input UPS1 = L3 input UPS2.
N input UPS1 = N input UPS2.
RESERVE
L1 reserve UPS1 = L1 reserve UPS2.
L2 reserve UPS1 = L2 reserve UPS2.
L3 reserve UPS1 = L3 reserve UPS2.
N reserve UPS1 = N reserve UPS2.
OUTPUT
L1 output UPS1 = L1 output UPS2.
L2 output UPS1 = L2 output UPS2.
L3 output UPS1 = L3 output UPS2.
N output UPS1 = N output UPS2.
Close the UPS1 output and reserve switch and the UPS2 reserve switch. Check that there is
no difference between the UPS2 reserve input and output voltages
Mains
Res.
Mains
line
line
line
DJER
DJE
DJE
DJBP
UPS1
Manual
DJS
DJS
Bypass
Output
Output
Figure 5.4: Position of switch-disconnectors when reserve line switch-disconnectors closed and UPS1 output switch-
Open the UPS1 output and close the UPS2 output. Check that there is no difference between
the UPS1 reserve input and output voltages
Mains
Res.
Mains
line
line
line
DJER
DJE
DJE
DJBP
UPS1
Manual
Bypass
DJS
Output
Output
Figure 5.5: Position of switch-disconnectors when reserve line switch-disconnectors closed and UPS2 output switch-
Disconnect both UPSs by opening all output and reserve switches
Res.
Mains
line
line
DJER
DJE
DJBP
UPS2
UPSn
Manual
DJS
Bypass
Output
disconnector closed
Res.
Mains
line
line
DJER
DJE
DJBP
UPS2
UPSn
Manual
Bypass
DJS
DJS
Output
disconnector closed
UPS Enterprise Parallelism Procedure
Res.
Mains line
line
DJER
OFF
DJBP
Mains line
Manual
Bypass
OFF
(Figure 5.5 on page
41).
Res.
Mains line
line
DJER
OFF
DJBP
Mains line
Manual
Bypass
OFF
(Figure 5.4 on page
41).
UPS 1
Reserve
M-Bypass
Output
ON
OFF
ON
UPS 2
Reserve
M-Bypass
Output
ON
OFF
OFF
UPS 1
Reserve
M-Bypass
Output
ON
OFF
OFF
UPS 2
Reserve
M-Bypass
Output
ON
OFF
ON
(Figure 5.5 on page
41).
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