Installation
Wiring Three Phase Tandem Pumps
23
Wiring Three Phase Tandem Pumps
Figure 18 shows the wiring schematic which allows both three phase STPs to operate simultaneously with any
combination of dispensers turned on.
Figure 18. Suggested Wiring For Three Phase Tandem Pumps
240 V
I
s
otrol
M
a
ke gro
u
nd connection
in
a
ccord
a
nce with loc
a
l
code
s
.
TB1
ATG
LEGEND
Bi-Met
a
llic
s
witch
Norm
a
lly
clo
s
ed
cont
a
ct
Norm
a
lly
open
cont
a
ct
S
crew
termin
a
l
Wire
a
dded
b
y in
s
t
a
ller
Wire
a
dded
b
y m
a
n
u
f
a
ct
u
rer
Electrical
interlock
On-winding
overload
protectors
Extractable
packer
Junction box
in manifold
Motor
STP
R
O
G
The ATG termin
a
l will
b
e the
sa
me volt
a
ge
a
nd
ph
as
e
as
the power
su
pplied to the L1 termin
a
l.
Or
a
nge
Red
Bl
a
ck
L1
L1
L1
L2
N
L
3
L2
L2
L
3
L
3
To
38
0-415V
Su
pply
240 V Coil
Cont
a
ctor
For Remote
Control
M
a
n
ua
l Motor
Protector
S
ee Appendix C
M
a
n
ua
l Motor
Protector
S
ee Appendix C
COIL
3
2
To
S
TP
Or
a
nge
Red
Bl
a
ck
L1
L1
L1
L2
N
L
3
L2
L2
L
3
L
3
To
38
0-415V
Su
pply
240 V Coil
Cont
a
ctor
For Remote
Control
COIL
3
2
To
S
TP
2 Pole Rel
a
y
(240V Coil)
L1 (
38
0-415V)
Ne
u
tr
a
l of Power
Su
pply
