Steady Flow Selection (Dip Sw3 - Position 1); Tank Size And Bump Mode Adjustments - Franklin Electric SUBDRIVE UTILITY UT3P Manual Para Propietarios

DRIVE CONFIGURATION
Performance Settings
Shallow Set: If the pump is installed in an extremely shallow (i.e. artesian) well and the system continues to
trip, then the Underload Potentiometer will need to be adjusted counter-clockwise to a lower sensitivity
setting. Check the Underload trip level and repeat as necessary.
Deep Set: In cases where the pump is set very deep, run the system at open discharge to pump the well
down and observe carefully that an Underload is detected properly. If the system does not trip as it should,
then the Underload potentiometer will need to be adjusted clockwise to a higher sensitivity setting.
The Underload Sensitivity MUST be adjusted only when the drive is POWERED OFF. The new setting will not
take effect until the drive is powered up.
Steady Flow Selection (DIP SW3 – Position 1)
The drive is configured at the factory to ensure quick response to maintain constant pressure. In some cases,
when using a pressure sensor, the drive may offer better control through a slower response time.
For example, if the system has a water line tapped before the pressure tank or close to the well head, or
where audible speed variations of the pump assembly can be heard through the pipes, adjusting the
pressure control response time by enabling the Steady Flow feature may be helpful. After enabling this
feature, the installer should check flow and pressure changes for possible overshoot. A larger pressure tank
and/or a wider margin between the regulated pressure and the pressure relief valve pressure may be
required because the Steady Flow feature reduces the drive's reaction time to sudden changes in flow.
To activate the Steady Flow feature, remove power and allow voltage to discharge. Move DIP SW3 Position 1
to the SF (up) position. The new setting will not take effect until the drive is powered up.
Note: The Steady Flow feature will function with a pressure transducer; however, this practice is not
recommended. A more effective approach with a transducer is to adjust the System Response. Refer to
"System Response (DIP SW2 – Positions 2–4)" on page

Tank Size and Bump Mode Adjustments

The Tank Size and Bump Mode settings of the drive can be changed to modify system performance. Bump
Mode controls how hard the drive will pump for the very short time period just before attempting to shut
down. The default Tank Size and Bump Mode settings are compatible with most applications. For applica-
tions with large pressure tanks or trouble shutting down, the Tank Size and Bump Mode can be modified to
make the controller more aggressive.
Tank Size Selection (DIP SW3 – Position 3): The drive generally allows for a smaller pressure tank to be
used. If a larger pressure tank exists in the system, the pressure control may need to be adjusted to help the
system properly shut off at low or no flow. If a smaller tank is being used and the system is shutting off as
expected, SW3 Position 3 may remain in the ST (down) position. If a larger pressure tank is used, or if the
system is having difficulty shutting down at low or no flow, place SW3 Position 3 in the LT (up) position to
improve the ability of the system to shut off in low-flow conditions.
Aggressive Bump (DIP SW3 - Position 4): In applications where the default bump setting is not aggressive
enough for the system to shut down as expected, the bump can be modified to be more aggressive. To
enable the Aggressive Bump feature, place SW3 Position 4 in the AB (up) position.
Bump Disable (DIP SW3 - Position 5): In applications where the occasional pressure bump is not desirable,
the bump feature of the drive may be disabled. To disable the bump feature, place SW3 Position 5 in the BD
(up) position.
IMPORTANT: Disabling the bump feature will result in the system having more difficulty shutting down in
low-flow situations.
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