amp draw

ws9876

I tested my Franklin 1hp AC pump with a clamp meter on 1 leg. It showed about 16 amps so 2 legs should be about 3800 watts on start up. But thats downstream from the capacitor start box ....so is the surge coming from the capacitor? Would it be as much before the capacitor box? That would be the real amount coming out of the AC service panel...Thats what I want to know so I can compare it to a Grunfos sq200 which is only a 2 wire pump with no external start capacitor though they claim it has an internal soft start of some kind....what do you know about this..?

Dave Angelini

Full part number of the Grundfos is ?
 If it is an SQ,  it is soft start and will be far easier to start than the Franklin. Also need its part number to be accurate.

SumPower

Very little of the surge current when starting a single phase motor is because if the capacitor in the circuit.

The purpose of the capacitor is to create a phase shift in the start winding to create the rotating magnetic field.

The motor conductors are in series, so the amperage draw is going to be the same at any point in the circuit that you have access to measure it with a meter.

Dave Angelini

The cap cuts some of the surge but it is not by any means a soft start with the common Franklin pumps that are out there.  A meter may not pick it all up as it is out of phase.

ws9876

SumPower said:

Very little of the surge current when starting a single phase motor is because if the capacitor in the circuit.

The purpose of the capacitor is to create a phase shift in the start winding to create the rotating magnetic field.

The motor conductors are in series, so the amperage draw is going to be the same at any point in the circuit that you have access to measure it with a meter.

so are you saying the 16 amps is the total from the panel to the motor...not double that ?