Veeder-Root Red Jacket Quick-Set Installation, Operation And Service page 32

4" Standard Pump Installation, Operation & Service Manual
Wiring Three-Phase Tandem Pumps
Figure 23 shows the wiring schematic which allows both three-phase STPs to operate simultaneously with any
combination of dispensers turned on.
L1
X2
2 Pole
Relay
LEGEND
Overload Normally
heater closed
contact
153/3ptndmwir.eps
To Power Supply by Installer
L1 L2 L3
3
L2
3 2 4 1 L3
COIL
T1 T2 T3
Orange Black Red
To STP by Installer
(see diagram below)
Neutral of Power Supply
Normally Screw Wire added
open terminal by installer
contact
Figure 23. Suggested Wiring For Three-Phase Tandem Pumps
To Power Supply by Installer
L1 3
X2
T1
Orange
To STP by Installer
(see diagram below)
Dispenser Sw.
Conduit/contractors
box attached
to manifold
Wire added
by manufacturer
STP
27
Wiring Three-Phase Tandem Pumps
L1 L2 L3
3
L2
2 4 1 L3
COIL
T2 T3
Black Red
230V
Electrical
interlock
Extractable
R
packer
O
G
Internal
overload
protectors
Motor