Variable Frequency Drives & Digital Phase Converters

Constant Pressure

With the Perfect Pressure™ wizard, constant water pressure control is easily configured in a few simple steps

 

What Is Perfect Pressure™?

Demand-driven constant pressure for home wells is now inexpensive, reliable, and a luxury available to all homeowners thanks to Perfect Pressure™.

Perfect Pressure™ only requires a few minutes of setup time and is capable of controlling the most complicated plumbing systems with ease. With constant pressure, plumbing systems run smoothly with fewer instances of short cycling.

 

Perfect Pressure Setup

  1. SETUP CONSTANT PRESSURE? YES (ENTER) / NO (HOME)

    Allows the user to configure the VFD to maintain constant pressure on the plumbing system. If the plumbing application does not require constant pressure, selecting “No” will cause the VFD to run in a simple on/off configuration which is ideally suited for a float or open discharge application.

  2. 4-20mA PSI SENSOR RANGE

    Allows the user to enter the pressure sensor value so the VFD will read the correct pressure. This value is typically indicated on the pressure transducer, with the default value of 150 psi for Phase Technologies’ pressure transducers. If the entered value does not match the transducer pressure operating range value, then the correct pressure will not be indicated on the VFD.

  3. PSI SETPOINT

    Allows the user to enter the pressure value to be maintained. The VFD will maintain this desired pressure by varying motor speed based on the setpoint and the current line pressure. As pressure drops, the motor speed will increase, and as pressure increases, the motor speed will decrease or remain constant.

  4. SUBMERSIBLE PUMP

    Allows the user to select whether the pump for the given application is a submersible pump.

    If “Yes” is selected, then a ramp-up profile is used to accelerate the frequency from 0-30 Hz in one second and then further ramps up from 30 Hz to the maximum frequency. This ramp sequence is needed to protect the submersible pump motor’s thrust bearing.

    If “No” is selected, then a linear ramp is used. A linear ramp is typically associated with centrifugal or above ground motors but will damage the motor of a submersible pump.

    Note: It is critical that the correct motor type for the given application is identified before setting this parameter.

  5. ENABLE RESTARTS - YES (ENTER) / NO (HOME)

    Allows the user to configure the VFD to automatically restart after a power loss and continue regulating at the desired pressure.
    If “No” is selected, the user will have to manually restart the VFD by pressing Run/Auto on the keypad.

  6. DISABLE MANUAL MODE

    Allows the user to disable manual mode to prevent the drive from constantly running in manual mode with no pressure control. Manual mode causes the VFD to ramp the motor to full speed and ignore the pressure sensor. Running in manual mode could over pressurize a plumbing system and cause it to fail and is typically used only when constant pressure control is desired.

  7. OVERCURRENT LIMIT

    Allows the user to enter the overcurrent limit value to prevent the drive from overpowering the motor and potentially damaging it. The limit entered should match the pump motor service factor amperage and should never exceed it. If the limit is exceeded, the VFD will display a fault, indicating a possible issue with the motor.

  8. OFF

    Reflects the current operating status of the pump. Pressing Run/Auto will start the pump, and the pressure will be displayed.