DRIVE CONFIGURATION
Performance Settings
27
Performance Settings
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).
Minimum Frequency (DIP SW3 – Position 8)
The default minimum speed for submersible pumps is 35 Hz. If necessary to prevent hydraulic vibration in
the piping system, the minimum speed can be raised to 40 Hz. To raise the minimum speed, place DIP SW3
Position 8 in the
Hz
(up) position.
NOTE:
The default for surface pump applications is 40 Hz. When the drive is programmed for a surface
application, this switch has no effect.
Underload Sensitivity
The SubDrive Utility 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, acti
-
vate 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.
NOTE:
When operating a surface pump, the drive includes a non-adjustable Prime Delay. Each time the
pump is started, any underload condition will be ignored for a period of two minutes to allow the pump to
prime.
If it becomes necessary to adjust the Underload trip level, remove power and wait five minutes for the con
-
troller 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 set
-
ting. 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 SubDrive Utility is POWERED OFF. The new set
-
ting will not take effect until the drive is powered up.
Risk of damage to
d
rive or water system can occur due to improper
adjustment or settings.
•
System behavior should be monitored when adjusting any of these settings to ensure proper opera
-
tion.
•
Confirm that an adequate pressure relief valve is included in the system.
