Date returned to manufacturer added.
The protection switch from the reverse osmosis (ro) machine was returned to the manufacturer for physical evaluation.
A visual examination was performed on the switch.
The switch was disassembled and a deformity of the plastic rocker was observed.
The deformation caused an incomplete closure of the electrical contact from one of the three line conductors.
An electrical test was performed on the device which confirmed that one line was not activated.
The manufacturer found the machine to have been conforming to specification.
Based on concentrate pressure evaluation at the manufacturing site during final release and information regarding the customer site connection, the manufacturer concluded that the electrical connection at the power supply was incorrect performed at the customer site.
The manufacturer states that the device was functioning at the customer site without reaching the intended concentrate pressure; however, the electrical phase connection would be hardly detectable and perhaps not suspected.
There would be a final high current at one of the phases, which would be generating the overheating leading to the deformation of the switch component.
As a consequence of the air gap of the electrical contact, the motor would only operator with two line conductors and trip the motor protection switch, which would lead to customer observance of the issue.
The motor protection switch was replaced on the ro unit at the customer site and the rotation direction was corrected.
There is no indication of any systemic design, material, or manufacturing related issue.
The investigation into the cause of the complaint was able to confirm the reported event.
The visual examination and electrical testing of the protection switch confirmed that the part sustained heat damage.
Therefore, the complaint is confirmed.
|