Gorman-Rupp Pumps SFDV3B 1520902 and up - Manual (Page 12)

OM-06405 SF SERIES
PAGE B - 4 INSTALLATION
Figure B-1. Three Phase Power
Cable Connections
Control leads P1 and P2 provide the motor with
thermal protection. Control leads W1 and W2 pro­
vide the motor with moisture protection. Refer to
Figure B-3 and connect the pump control cable to
the control box.
Figure B-2. Control Cable Connections
The thermal protection contacts will auto­
matically reclose when the motor cools to
the established safe operating tempera­
ture. Whenever automatic restarting is not
desirable, connect only to controls which
are wired for manual restart.
Refer to the appropriate wiring diagram accompa­
nying the control box when making electrical con­
nections.
Liquid Level Devices
Optional controls available from Gorman‐Rupp
may provide a means to automatically regulate the
liquid level. These control boxes may be con­
nected to the following sensing devices which per­
form either filling or dewatering functions (see Fi­
gure B-3).
The internal wiring of the sensing devices
are different for filling and dewatering func­
tions. Be sure to follow the instructions in­
cluded with the option before making con­
nections.
S
Diaphragm Type: two fixed‐position sen­
sors (upper and lower) each contain a dia­
phragm which flexes with changes in liquid
level, thus activating an enclosed miniature
switch.
S
Bulb (Float) Type: a bulb raises or lowers
(floats) with the liquid level, thus activating
an enclosed miniature switch.
Other types of liquid level devices may also be
used. Consult the factory for the liquid level device
best suited for your application.
Liquid level devices must be positioned far
enough to allow 6 minutes between starts.
If the pump motor cycles more than 10
starts per hour, it will over‐heat, resulting in
damage to the motor windings or control
box components.