DRIVE CONFIGURATION
Performance Settings
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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 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 pres
-
sure 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.
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 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 shut
-
ting 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) posi
-
tion 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.
Performance Enhancement for Long Cable Lengths
In some applications customers may experience erroneous locked rotor faults (Fault Code 3) when:
•
Total motor cable length (offset and drop) exceeds 300 feet and/or
•
Input voltage is below 208VAC or above 240VAC.
In an application as described above, if unexpected locked rotor faults (Fault Code 3) are occuring:
1.
At motor startup, set DIP switch SW3 – Position 7 to the ON/UP position.
2. Intermittently when the system has been running, set DIP switch SW3 – Position 8 to the ON/UP posi
-
tion.
Note:
This feature requires firmware version 3.3.1. Refer to
