2 Installation
24
Alpha Technologies
2.8 Transformer Output Load Sharing
2.8.1: Transformer Output
The units have a single phase output. They do NOT have three phase characteristics.
Figure 2.10 shows the voltages between L1, L2 and N for 120/208/240 units and between L and
N for 230 VAC units
2.8.2: Load Sharing
The total current drawn from each winding must not exceed that winding’s maximum output
current rating (Figure 2.11). For 60 Hz units, where possible, connect 120 VAC loads to L1.
Since loads are shared between windings, you can exceed a winding’s output without exceed-
ing the unit’s maximum current output. There are two ways to calculate the current drawn by the
loads; measuring or displaying the output current.
230 VAC
120 VAC
120 or 88 VAC
208 VAC
240 VAC
L1
NEUTRAL
NEUTRAL
FERRO
TRANSFORMER
240 or 208 VAC
32 VAC
120 VAC
88 VAC
120 VAC
60 Hz Units
L
50 Hz Units
FERRO
TRANSFORMER
L2
Figure 2.10
Transformer Output
z
H
0
6
0
0
0
5
R
F
C
z
H
0
6
0
0
0
5
R
F
C
z
H
0
6
0
0
0
5
R
F
C
z
H
0
6
0
0
0
5
R
F
C
z
H
0
6
0
0
0
5
R
F
C
z
H
0
5
0
0
0
5
R
F
C
z
H
0
5
0
0
0
5
R
F
C
z
H
0
5
0
0
0
5
R
F
C
z
H
0
5
0
0
0
5
R
F
C
z
H
0
5
0
0
0
5
R
F
C
1
L1
L1
L1
L1
L
s
p
m
A
6
.
1
4
s
p
m
A
6
.
1
4
s
p
m
A
6
.
1
4
s
p
m
A
6
.
1
4
s
p
m
A
6
.
1
4
L
LLLL
s
p
m
A
7
.
1
2
s
p
m
A
7
.
1
2
s
p
m
A
7
.
1
2
s
p
m
A
7
.
1
2
s
p
m
A
7
.
1
2
2
L2
L2
L2
L2
L
s
p
m
A
4
2
s
p
m
A
4
2
s
p
m
A
4
2
s
p
m
A
4
2
s
p
m
A
4
2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Figure 2.11
Transformer Output Current Ratings
