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3. Installation and Wiring
• The utility AC power must be three phases (R/S/T) and meet the specifications on the UPS rating label. When connecting the utility
input power to the UPS, make sure it is in positive phase sequence (clockwise phase rotation).
• Connect the external battery cabinet's grounding terminal to the grounding terminal (
Do not connect the grounding terminal of the external battery cabinet to any other grounding system.
• The ground terminal (
) of the UPS must be grounded. Use ring-type terminal for wiring.
WARNING:
1. Incorrect wiring will lead to severe electric shock and damage to the UPS.
2. The UPS will not work normally if the input power's neutral (N) is not firmly connected or is not connected to
the AC Input Block's neutral (N) terminal.
3.6.2 Single Unit Wiring
Note: Prior to wiring, first read 3.6.1 Precautions Prior to Wiring.
Single Input (Single Unit)
When there is only one AC power source, single unit wiring procedures are as follows:
1
Remove the cover plates shown in Figure 3-5 to access the wiring terminal block shown in Figure 3-7.
SUTX20K
PARALLEL
PARALLEL
PARALLEL
SWITCH
P1 P2 P3 P4 P5 P6
P1 P2
OUTPUT
INPUT
DRY CONTACT
DRY CONTACT
ON
I
ON
I
I
ON
I
ON
OFF
O
O
OFF
O
OFF
O
OFF
R
S
T
N
INPUT BREAKER
+
N
240V DC
240V DC
BATTERY INPUT
-
+
N
240V DC
240V DC
BATTERY INPUT
+
-
R
N
6
5
RS-232
1 2
MANUAL BYPASS SWITCH
ON
WARNING:
CHARGER
REPO
DETECTION
OPENING THIS COVER PLATE WILL
CAUSE INVERTER SHUTDOWN.ONLY
AUTHORIZED SERVICE PERSONNEL
CAN OPEN AND OPERATE IT.
I
ON
I
ON
I
ON
I
ON
O
OFF
O
OFF
O
OFF
O
OFF
R
S
T
N
BYPASS BREAKER
-
R
S
T
N
R
S
T
N
AC INPUT
UPS OUTPUT
R
S
T
N
R
S
AC INPUT
UPS OUTPUT
S
T
N
R
S
1
2
4
3
(Figure 3-5: Wiring Terminal Block)
+
T
N
240V DC
BATTERY INPUT
+
-
T
N
N
6
5
11
) of the UPS system's battery terminal block.
SUTX40K
PARALLEL
PARALLEL
PARALLEL
SWITCH
RS-232
1 2
MANUAL BYPASS SWITCH
ON
P1 P2 P3 P4 P5 P6
P1 P2
WARNING:
WARNING:
OUTPUT
INPUT
CHARGER
DRY CONTACT
DRY CONTACT
REPO
DETECTION
OPENING THIS COVER PLATE WILL
OPENING THIS COVER PLATE WILL
CAUSE INVERTER SHUTDOWN.ONLY
CAUSE INVERTER SHUTDOWN.ONLY
AUTHORIZED SERVICE PERSONNEL
AUTHORIZED SERVICE PERSONNEL
CAN OPEN AND OPERATE IT.
CAN OPEN AND OPERATE IT.
I
ON
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
O
OFF
N
R
S
T
N
R
S
T
INPUT BREAKER
BYPASS BREAKER
-
+
N
R
S
T
N
R
S
T
N
AC INPUT
UPS OUTPUT
240V DC
240V DC
BATTERY INPUT
-
N
R
S
T
N
R
S
T
N
AC INPUT
UPS OUTPUT
240V DC
R
S
T
N
R
S
T
1
2
3
N
4
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