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  1. triden

    Strange current imbalance on pumps

    I have a system with some submersible pumps that are fed by some Siemens Sirius soft starts. Pumps are 125HP @ 600vac. When we run the pump, the softstart gets up to speed like normal (5s ramp) and the bypass contactor pulls. Within about 10 minutes they start overloading and tripping (some trip...

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