3 Installation
MY Series (10kVA-40kVA) UPS
User Manual
42
M
a
in
s
in
p
u
t U
M
a
in
s
in
p
u
t V
M
a
in
s
in
p
u
t W
In
p
u
t N
B
a
tte
ry
+
B
y
p
a
s
s
L
O
u
tp
u
t L
O
u
tp
u
t N
B
a
tte
ry
-
B
a
tte
ry
+
B
a
tte
ry
N
B
a
tte
ry
-
B
a
tte
ry
N
B
a
tte
ry
+
DC Breaker 1
DC Breaker 2
DC Breaker 3
DC Breaker 4
+
-
EXTERNAL BATTERY CABINET 2
N
UPS1
UPS2
+
-
N
EXTERNAL BATTERY CABINET 1
+
-
EXTERNAL BATTERY CABINET 2
N
+
-
N
EXTERNAL BATTERY CABINET 1
G
ro
u
n
d
in
g
B
a
tte
ry
-
B
a
tte
ry
N
B
a
tte
ry
-
B
a
tte
ry
N
B
a
tte
ry
+
Figure3-29
30/30S/40/40S wiring diagram of 31 mode parallel system
Step 3
Connect the parallel port of each UPS in parallel by parallel wires, as shown in Figure3-30 and
Figure3-30
Double parallel wiring diagram
Figure3-31
Four parallel wiring diagram
The parallel wiring operation of MY series (10kVA-40kVA) is the same, above we take 10 as an
example to illustrate.
When the battery pack is shared by UPS in the parallel system, please make sure that all battery
parameters of each UPS are consistent, such as battery capacity, battery number, charging voltage and
charging current.