Franklin 5870206300 installation manual Motor Soft Start, System Diagnostics, Unique Features

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 efficiency 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 flow rating is not available, the controller can be configured to use larger pumps up to the horsepower rating of the motor.

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