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-   -   well pump electrical multimeter question (http://www.diychatroom.com/f18/well-pump-electrical-multimeter-question-70103/)

tpolk 04-28-2010 06:22 PM

well pump electrical multimeter question
 
my pump, a goulds 1/2hp 4"submersible has decided to quit. water level is within 20' of the ground and the well is 275' deep with the pump set at 225'
I own a craftsman autoranging digital multimeter which i dont know how to use well. I was able to check both sides of the 30amp double pole breaker and was reading 124 each leg. checked the wire at the well and read almost exactly the same

when i have someone turn the pump on at the house i can hear the pump come on in the well, it starts to push water and then after approx 3 sec it sounds like it stops running plus no water.

my question is can i with this meter check the resistance or continuity using the two wires going to the pump to see if the pump is seizing or maybe there is a thermal kickout on it. the thing with the thermal lock out is i can get the pump to duplicate with out waiting.

if I'm trying for ohms do i touch each wire and what do i read. If i look for continuity same question. put this pump in ne last november so i hope warranty covers it if it needs pulling

thanks timothy

joed 04-28-2010 06:33 PM

Two wire or three wire feed to pump. could be a bad capacitor or control box if three wire. The pump could be running on start winding and overheating.

tpolk 04-28-2010 06:35 PM

2 wire

joed 04-28-2010 06:36 PM

When it stops is there still voltage to it? If there is then I would say the pump is defective.

tpolk 04-28-2010 06:38 PM

yes still voltage. is there a way to check continuity thru the pump by using the two wires or does it not work like that since each wire supplys juice to the motor

3 legged dog 04-28-2010 07:38 PM

1 Attachment(s)
Every time my well acts up, it is this pressure switch that is the problem.

tpolk 04-28-2010 07:51 PM

pressure switch brand new and appears to be functioning correctly. how would i know if it wasnt?

Yoyizit 04-28-2010 07:58 PM

You need to measure the current, 7A or so. A clamp-on ammeter is recommended, but you can also use a shunt. Even if your meter has a 20A AC current scale, it still may pop the meter's internal fuse, if it has one.
Post a link to your meter; maybe more performance can be squeezed out of it.

tpolk 04-28-2010 08:04 PM

sorry computer illiterate for links. its a sears craftsman auto ranging digital multi meter model 82400

Yoyizit 04-28-2010 08:17 PM

Quote:

Originally Posted by tpolk (Post 435033)
sorry computer illiterate for links. its a sears craftsman auto ranging digital multi meter model 82400

Can't get a pic of it, even from the Sears site. Search engines are great when they actually work. What's the lowest AC voltage range on the meter?

tpolk 04-28-2010 08:31 PM

from the table in the book it shows ac voltage-range 400mV,resolution-0.1mV
v-ac, range 4v, resolution-1mV
40-400 Hz, range 40v, resolution 10mV
auto ranging,400v/700v, resolution 100mV/1v
thanks for your input once i get a handle on the use of this tool it will stick, been in construction long time so some experience with electric first time wading into meter pool

Yoyizit 04-28-2010 08:37 PM

Using the pump wire itself as a shunt is kind of hard to explain, so I'd get a clamp on ammeter. It'll pay for itself the first time you successfully diagnose anything with it.

Voltage is half the story; current is what makes things happen.

tpolk 04-28-2010 08:44 PM

under current it has range 4A/ resolution 1mA
range 20A/ resolution 10 mA does this have any bearing?

Yoyizit 04-28-2010 08:50 PM

Quote:

Originally Posted by tpolk (Post 435067)
under current it has range 4A/ resolution 1mA
range 20A/ resolution 10 mA does this have any bearing?

Resolving 1 mA out of 4000 mA is pretty good.

I doubt you'll get away with using the 20A scale for a 1/2 hp motor. Even good motors draw a start-up surge.

tpolk 04-28-2010 08:54 PM

thanks for your input


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