lead identification

[Grover194]

You may be able to assist with some advice.
I have come across this situation many many years ago,but do not recall the method and sequence.

I have a client who has just installed a 16" submersible pump, 6 leads out, and has mixed up the leads.
(The job is in remote outback Australia) and they have just spent two days installing the motor and pump.)
( their electrician did not pre identify the lead end)

A RED ? ( unknown if A1 or A2 )
A RED ? ditto

B WHITE ? ditto
B WHITE ?

C BLUE ? ditto
C BLUE ?

With a submersible motor, there is no room for trial and error as per a foot mount motor.The motor must run up to speed in 3-5 seconds.
There is a method of using a meter to determine lead ends, can you assist? What type of meter can they use.
(from memory it is a centre reading ohm meter, but with 6 long leads at 150 feet each @ 95 sqmm )
I do not know the method or what to expect.)
The motor has to be connected in Delta, and operate first time.
If you can help I would appreciate your advice.

 

[waross]

Start by searching Eng-tips. This topic has been answered several times. If the existing suggestions do not answer your specific problem then by all means come back and ask again, but please do a search first.
Thanks
respectfully

 

[Grover194]

I have gone back a long way and not found any thing to help.
This must be a NON trial and error method that can be done on site with the pump down 60 meters.
I can sort out the pairs, but need to identify start and finish ends or A1 and A2 correctly and then to run correctly the first time power is applied.
Direction can be determined by output flow.
Can you help?

 

[edison123]

If you have surge comparison tester (Baker), then you can do by trial and error without running the motor.

With a multimeter, you can idenitfy the pairs of leads with continuity (A1&A2 - B1&B2 - C1&C2).

Link 1's (A1, B1 & C1). Use the surge comparison tester at A2, B2 & C2 to compare two phases at a time. If all the three waveforms match, you are done.

If not, interchange leads of A phase and try again. If problem not solved, repeat lead change for B & C phases.



*Even inside a hard-boiled egg, there is a golden heart!!!*

 

[stardelta]

If it absolutely has to be a non trial and error method it can be done using a Surge-tester or a Mota-scope as Edison suggests. Unfortunately both these pieces of kit are almost unique to the trade and rarely found outside of a repair/rewind shop. You may be able to beg/borrow/hire one for a short period of time or you may have no option but to bring in a repair company prepared to do it for you in the field.

 

[Grover194]

http://www.eng-tips.com/viewthread.cfm?qid=153197

This thread has an excellent technique, using a 6 volt battery and meter