The maximum sand content of the water may not exceed 50 g/m³.
The EF and SE pumps are equipped with motors cooled by the surrounding pumped medium.
There are several reasons as to why the permitted full load current could be exceeded when operating the pump:
Grundfos industrial pumps can be equipped with a wide variety of mechanical seals.
The flow switch only causes the MQ to switch off automatically during normal operation if the flow rate drops below 0.07 m³/h.
The MQ is equipped with both an internal flow switch and an external pressure switch. Both are able to switch on the MQ when water is extracted.
Pure, low-viscosity, non-explosive media without solid matter or long fibres.
The problem may relate to the pressure switch (press control), since deposits can cause it to malfunction.
The operating instructions provided with every Grundfos product contain relevant troubleshooting information.