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Motor Soft Start
Normally, when there is a demand for water, the SubDrive300 will
be operating to accurately maintain system pressure. Whenever the
SubDrive300 detects that water is being used, the controller always “ramps
up” the motor speed while gradually increasing voltage, resulting in a cooler
motor and lower start-up current compared to conventional water systems.
In those cases where the demand for water is small, the system may cycle
on and off at low speed. Due to the controller’s soft-start feature and
sensor’s robust design, this will not harm the motor or the pressure sensor.
System Diagnostics
In addition to regulating pump pressure and accurately controlling motor
operation, the SubDrive300 continuously monitors system performance and
can detect a variety of abnormal conditions. In many cases, the controller
will compensate as needed to maintain continuous system operation. But
if there is high risk of equipment damage, the controller will protect the
system and display the fault condition. If possible, the controller will try to
restart itself when the fault condition subsides.
Unique Features
SubDrive controllers provide the ultimate in system performance, utilizing
Franklin Electric’s three-phase motor series for maximum starting torque,
high effi ciency and smooth operation. SubDrives convert residential single-
phase 60Hz power into the variable-frequency three-phase needed by the
motor. In addition, SubDrives can spin a smaller pump slightly faster to
boost output to roughly double its 60Hz horsepower rating. This allows use
of smaller pumps for less system cost. If a smaller pump of the desired fl ow
rating is not available, the controller can be confi gured to use larger pumps
up to the horsepower rating of the motor.