Franklin Electric SUBDRIVE UTILITY, Owner'S Manual

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INSTALLATION AND SETUP
Drive Configuration
28
Steady Flow Selection (DIP SW3 – Position 1)
The SubDrive Utility is configured at the factory to ensure quick response to maintain constant
pressure. In some cases, the drive may need to be adjusted to 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 over-
shoot. A larger pressure tank and/or a wider margin between the regulated pressure and the pres-
sure 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.
Tank Size and Bump Mode Adjustments
The Tank Size and Bump Mode settings of the drive can be changed to modify system perfor-
mance. 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 applications 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 SubDrive Utility 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) posi-
tion. 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.