Wiring a star delta pump DOL

[Tony S]

It could be done with a DVM with peak hold function, it will record +/- values.

To be honest when on site it’s been a case of swap windings and try the motor, if it still sounds dog rough return the first winding and swap another pair.

In 40+ years I’ve only had this problem a handful of times, always with rewound motors.

 

[Lurch]

Am i right in thinking this is also achievable with an LED if you don't have an analogue meter? 

If you try this you might be better with 2 LED's in reverse polarity so you have some idea if the polarity is going one way or the other, rather than one way or maybe the other/or nowhere.

 

[Sidewinder]

@Canoeboy, just wondering what current rating your 10V supply is?