Single-screw pump failure
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Two new single-screw pumps in the factory have failed one after another. Same model: G25-1 1.5KW-6 standard motor. Pump A: does not deliver water; contact the manufacturer – it is suspected that no fluid was filled during the first start-up, and the rubber sleeve is worn out; the sleeve was replaced, but water still does not flow, and the amount of water delivered is very small. Pump B: No issues for now; updates to follow. Both pumps are equipped with frequency converters purchased by the contractor. The manufacturer now claims that the pump is equipped with a standard motor; it’s not advisable to use a separate frequency converter, as this can easily damage the motor. Additionally, the motor won’t have enough power, resulting in Pump A being unable to deliver water, or only delivering a very small amount of water. It’s best to use an inverter together with an inverter-driven motor. Could this be the reason why water doesn’t flow?
When replacing a power-frequency motor with an inverter-driven one, it should operate at as high a speed as possible, not below 60%; running at too low a speed can indeed lead to motor damage. If Pump B is fine, first check whether Motor A is okay. Another question is whether flow competition between the two pumps will occur?