One of my dealer called me up and asked my advice about the burned RO motor. His client was complaining about the quality of the said motor and again asking for a warranty.
Based on the details and data that I gathered, it was due to incomplete safety feature of the system. Here are the results of the investigation.
1) System is suffering from cavitation or low feed volume(volume of water coming to the pumphead/Procon is insufficient) thus breaking the carbon parts of the pumphead.
2)As the carbon parts were broken, it prevented the pumphead shaft from rotating and since it was attached to the RO motor shaft,said motor was forced to rotate it's shaft unsuccessfully resulting to the increase in ampere rating that lead to the burning of the motor winding.
Burning of motor could have been prevented if safety devices were incorporated to the design of the system such as:
1)Low pressure switch- in events where in there is low feed volume and pressure, said switch would immediately cut the current, thus stopping the rotation of the RO motor and pumphead.
2)Magnetic contactor and overload relay- should there be an increase in ampere rating,at a given setting, it will cut the power supply going to the RO motor.
Most of the times,clients felt that if there is a problem with any of the parts they are using, they usually blame it's quality and not considering the entire design of the system.
Just sharing my experience.
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