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Posts posted by ante

  1. Hi Guys,

    From what I have seen; a single phase motor with a starting cap on the side is actually a 3-phase motor able to run on a single phase by means of this cap!?
    In that case it should be possible to run the motor from a three-phase frequency converter if the cap is removed and the jumpers are altered in the junktionbox; this will probably increase the efficiency and torque.

    but I might be wrong.

  2. Hi Steve,

    The current sensing could be kept simple by using a low value resistor in series with the pump motor wiring. Some experimenting will reveal suitable threshold values (voltage drop) where to switch the pumps off and on. You probably need to make some delays (analogue or digital) for start currents and any other extreme condition that might occur. The shunt resistor value can be calculated from the motor current and the voltage your A/D converter can work with (don

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