4.6 Maximum RPM Setting
All PS controller offer the option of reducing the maximum
speed of the pump.
This RPM control reduces the maximum speed (RPM limit)
to as low as about 30 %. It will NOT reduce the starting or
low-light performance. The pump uses less power when it
pumps less water.
Reasons to reduce the maximum RPM:
To prevent over-pumping a limited water source. See 1.
section 5.8, Utilizing a Low-Production Water Source
To improve energy and water-source management in 2.
a battery system where slow pumping is adequate to
meet the demand
To limit the back-pressure (and prevent possible 3.
pump overload) when pumping into a direct-pumped
irrigation system, a filtration system, or an undersized
pipeline.
How to reset the Maximum RPM setting:
Remove the bottom end of the PS controller enclo-1.
sure (the end with the conduit openings)
Locate the adjustment knob shown in the photo 2.
below (circled)
In most cases, the knob will be at the standard 3.
factory setting full clockwise as indicated by “setting
#1” illustrated below. Turn it counter-clockwise to
the desired setting. The exact positions may vary
from this illustration. Follow the ink marks on the
controller.
CAUTION If you perform this adjust-
ment, record the setting on the
System Report Form, see section 13.
If flow testing is done in the future,
the result may lead to a wrong
conclusion if this adjustment is not
accounted for.
Terminals inside the PS controllerFigure 7:
Maximum RPM
Setting Knob
4.7 Submersible Pump Cable and Splice
Selection of cable Use only an approved type of submers-
ible well pump cable, the same type that is used for
conventional AC pumps. It is available from your pump
supplier or installer, or a local water well supply distributor.
You need 4-conductor cable. It is often called “3-wire-with-
ground” because it has 3 power wires plus a ground wire.
To determine the minimum required wire size, refer to the
Systems Sizing Table.
Submersible Splice A splice kit includes crimp connectors
to join the copper wires, adhesive heat-shrink tubing, and
instructions. If the drop cable is too large to fit in the crimp
connector, cut off some of the wire strands. Use a crimping
tool, and observe that the wires are held very securely.
motor leader cable
wires spliced with
adhesive heat-shrink tubing
drop cable
Figure 8: Cable splice
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