ohm resistance

mike glass

Hey Wallies! Does anyone know what the resistance in ohms between "hot" and neutral on a one hp pump should be (in what range)? The motor manufacturer's tech department asked me what an ohm was when I called! The reading presently is .7ohms.

Chris_82

Depends one what type of motor?,...

Ac sync, dc brushless, etc...

Why do you ask?

Glenn Sossin_2

potential short - check amperage

I just had occassion to have to check out some UP 26- 99F 1/6hp pumps. The factor said the 115V version should have 14 ohms.

If you really have such a low ohm reading, .7 ohms? then your amperage should be off the charts. Check your amperage draw against the rating of the motor. You may have some shorted windings.

jim lockard

does it run?

What happens when power is applied?? .07 ohm should be blowing the breaker? If your motor runs then amp it out. J.Lockard

Edward A. (Ed) Carey_3

.7 Ohms ???

Mike,

Are you sure that you are reading the meter on the correct scale? I'm not being a smart a--, but just a thought.

Also, what is the motor doing, or not doing?

Ed Carey

Unknown

If it's split windings with a centrifugal switch he may be reading the average between the start winding and the run winding if he's only got two leads. The start usually has a pretty low resistance and draws a lot of amps momentarily until it's switched out of the circuit. If the motor is not running then the switch is closed and the start winding is in the circuit.

And to answer the question, no I don't

mike glass

Thanks Guys! Sorry but I've been away from my computer due to work. I haven't installed this pump yet because it checks out like the previous new pump/motor combination which smoked as soon as power was applied! The voltage is correct coming to the leads and the pump company replaced (supposedly) under warranty but I want to make sure they don't have a "bad run" of these motors. I don't like being a "parts changer" but can't seem to get info from the motor manufacturer. Thanks, Mike

mike glass

centrifugal switch

Oh, and yes it has a centrifugal switch.

mike glass

Thanks MPF! You affirmed what I suspected and after installing replacement everything started and amped out OK!Thanks for the input! Mike

midway_2

Differnt meters give different readings also. There are good meters and cheap ones.

Unknown

You're welcome...

I'm glad it all worked out!

Dale

ohms AC

You have to be a little careful with ohm readings and AC and inductive loads like a motor or tfmr or relay coil. The real ohms is Xl or inductive reactance. As the other post suggested the thing is to clip amp it when it's running. The ohm reading is useful to know to compare it to other motors for a quick test. Testing from hot or N to motor case is good too, shows that the winding or other wire connections aren't grounded.

realolman

You know

I have evolved to realize that some times, changing parts is the cheapest, most definitive, and easiest thing to do.