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    Pressure problem with Grundfos SQE system.

    I have had problems with the pressure regulation with the CU-300 for some time.
    I have installed a 0-100 psi pressure sensor but should I use 150 psi sensor instead?

    Using R100 I have readjusted the 4-20mA /0-100 psi setting several times in order
    to dampen overshoot, but the system is not always stable. Setpoint is 70 psi.

    Using Grundfos 15 SQE15-290 submersible pump down to 300 ft in a 320 ft well.
    Membrane tank adjusted to 70% of operating pressure.

    Info: The Grundfos SQE system is a constant pressure system with the VFD
    built into the motor which is a 10.700 rpm permanent magnet motor. Different
    controllers can be used such as CU-300, CU-301 or CU-200 (Solar pumps) etc.
    The Grundfos SQ series has now been discont. as it was merely a "blocked" SQE.

    All advice much appreciated,
    Last edited by Howard Johnstone; 05-03-2017 at 03:07 PM.

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