Performance Settings; Underload Sensitivity - Franklin Electric SUBDRIVE UTILITY UT3P Manuel Du Propriétaire

Performance Settings

Risk of damage to
adjustment or settings.
• System behavior should be monitored when adjusting any of these settings to ensure proper operation.
• Confirm that an adequate pressure relief valve is included in the system.
System Response (DIP SW2 – Positions 2–4)
When using a pressure transducer, the system response time can be adjusted to match user demands
related to a specific piping network. Faster response times can improve pressure stability in some systems.
However, if the response is too fast, the system could overshoot, leading to overpressure, rapid cycling, or
hydraulic noise.
Select one DIP switch for preset FAST, MED, or SLOW system response parameters. Selecting more than one
switch will result in an Invalid Configuration fault. If no selection is made, the system will default to SLOW
(no fault occurs).
Drawdown Feature (DIP SW2 – Position 5)
When using a pressure transducer, an optional "cut-in" pressure can be set to allow for more water to be
drawn from the tank. Drawdown isn't enabled or disabled, it's 5% or 20%. It's always enabled. For example,
a system setpoint pressure is 50 PSI and a cut-in pressure of 30 PSI would cause the drive to maintain sys-
tem pressure at 50 PSI when running; however when the system is idle, the drive will not start the motor
until the system pressure drops below 50 - 30 PSI = 20 PSI.
The default cut-in pressure is 5% of transducer range below the system pressure setpoint. Setting DIP SW2
Position 5 in the DD (up) position will change the cut-in pressure to 20% below the system pressure setpoint.
IMPORTANT: Pressure tank pre-charge should be less than cut-in pressure in all situations (whether draw-
down is at 5% or 20%).
Minimum Frequency (DIP SW3 – Position 8)
Minimum Frequency is always 30 Hz for 3-Phase and 3-wire Submersible. Minimum Frequency is adjustable
for surface motors. For 15 Hz operation, set SW3 position 8 to the down position. For 30 Hz operation, set
SW3 position 8 to the up position.

Underload Sensitivity

The drive is configured at the factory to ensure detection of Underload faults in a wide
variety of pumping applications. In rare cases (as with certain pumps in shallow wells), this
trip level may result in unnecessary faults. If the pump is installed in a shallow well, activate
the drive and observe system behavior. Once the system begins to regulate pressure, check
operation at several flow rates to make sure the default sensitivity does not cause false
Underload trips.
If it becomes necessary to adjust the Underload trip level, remove power and wait a minute or
two for the drive to discharge. Once the internal voltages have dissipated, locate the Underload
Potentiometer on the upper-right corner of the User Interface Board.
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.
d
rive or water system can occur due to improper
DRIVE CONFIGURATION
Pressure Input Selection (DIP SW2 – Position 1)
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