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Old 10-21-2013, 09:51 PM   #1
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Grundfos submersible well pumps


Anyone familiar with Grundfos submersible well pumps ?

They seem to have an unusually low starting current.

Take this model, 5SQ05-180-115v, for example.
It is a 2 wire, 1/2hp, 115v, 5gpm, pump that shows a
FLA rating of 7.7 amps and a 'overload' rating of 11 amps.
It appears that their 'overload' rating is what they're
calling the locked rotor amps.

This is highly unusual, as the locked rotor amps, or starting amps,
for a motor is typically 4x or more of the FLA.
But there seems to be something to this, because in another
forum, a well driller says he has no problem starting
this pump using a Honda EU2000i generator.

In Grundfos's literature, it states that the motor is permanent magnet
type and uses electronics to give it a soft start with reduced starting
current.

Anyone familiar with this ?

Arky

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