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3. Installation and Wiring
Dual Input (Single Unit)
When there are two AC power sources, single unit wiring procedures are as follows:
1
Follow 3.6.4 Dual Input Modification to modify the UPS for dual input. Only experienced engineers or service personnel should
modify single input/dual input setup. For dual input, the main AC source's Neutral (N) must be connected with the bypass source's
Neutral (N).
2
1
5
Follow steps
~
3
Connect the main AC source/bypass AC source/output/external battery cabinet cables to the wiring terminal block and do not forget
to ground the UPS (refer to Figures 3-13~3-18).
4
7
8
Follow steps
~
For the external
battery cabinet's
grounding( )
Connects
+
an external
N
battery
-
cabinet
(if necessary)
Protective
(Disconnect
Device)
in section Single Input (Single Unit).
in section Single Input (Single Unit).
SUTX20K
(20kVA Model)
I
ON
I
ON
I
ON
I
ON
I
ON
I
ON
I
ON
O
OFF
O
OFF
O
OFF
O
OFF
O
OFF
O
OFF
O
OFF
R
S
T
N
R
S
T
INPUT BREAKER
BYPASS BREAKER
-
+
N
R
S
T
AC INPUT
240V DC
240V DC
BATTERY INPUT
R S T N
4-Pole
Contactor
R S T N
Device
Protective
Device
R S T N
Connects the main AC source
(Figure 3-9: 20kVA UPS Single Unit Dual Input Wiring Diagram I )
I
ON
O
OFF
N
4-Pole
Contactor
Protective
Device
N
R
S
T
N
UPS OUTPUT
For the
UPS
grounding
(
)
(*CS:
CS
Contactor
Solenoid)
For the critical
loads' grounding ( )
14
R S T N
(*CS:
CS
Contactor
Solenoid)
R S T N
R S T N
Connects the bypass source
N
Connects the
T
critical loads
S
R
3-Pole Breaker
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