This was a bad contactor and by the time i got to it the voltage drop was really bad but if the customer had us check for voltage drop on a normal routine schedule maybe we could have caught this sooner....
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So this guy has got an issue. This is a 208 three-phase system. Line one to Two 203 Line two to three 204 Line one to three to a four. That's fine. Uh, let's go load one to two 102. load two to three 204. Load one to Three Eighty four. So if we do a voltage drop test, we've got 120 volts across. Uh, you know the first terminal. line one to load one and we have five volts on the second, six volts on the third. So this contactor which you can kind of see right there is not making a good connection and we have a bad contactor on that guy. so always check for voltage drop. Always make sure.
Is a contactor just like a relay? Also I surprised that thing didn't catch fire with that much voltage drop! Service area Kanata??
Just worked on a McCray water source heat pump that was thought to be a bad compressor. It was 3ph wired to a two pole contactor and one winding wired constant hot. The contactor had one bad pole so compressor sounded like it was kicking on but it wouldn’t pump. Changed contactor and she ran great.
That must be getting hot!
a contactor with build in heater. In cold climate environments it could be a feature
how is that contactor not on fire?
Not just on commercial units. The breaker on my residential indoor unit failed yet again this summer. Seems to be every 4 years. This time, i changed the breaker and so had the old one to teardown. found the spring behind the lever had corroded, broke, loosened the contacts on that leg, till the contacts arced enough to fail. Rest of the breaker was pristine. Looks like the body of the breaker being in the cabinet, it was cooled and air seepage from the crawlspace around the lever then condensed humidity on the spring, causing it to rust till breaking. Worse with that spring broken, the contacts remained closed (loosely) but there was no way for that leg to trip on overload anymore. Check those through cabinet panel breakers on indoor units if they aren't in conditioned space. Are you in Orleans ?
here in the uk, we don't call that volt drop, we call that a f*cked contactor… [joking aside Chris, that kinda thing is what causes fires if if's inside a building and is a damn good reason to keep the metal door of your panel SHUT]
Is that voltage drop or a complete leg of the contactor failed and reading ghost voltage thru the windings of the other legs? Either way you found the problem, just curious.
Seems like the 6v and 5v is legit voltage drop across. Thanks as always for the great content!!
I’m journeyman electrician for 9 years.
I’ve watched you shows. It’s has incredible caught my eye.
I work for large grocery stores in electrical repair and maintenance have worked beside refrigeration guys for years. Learned lots of things.
I’ve bought all tools I need for basic small install an and repair down to comp change out to low voltage troubleshooting. With my back ground in electrical I’ve been very successful in troubleshooting units.
I have made choice to return to to school learn
More about co2 systems. And among other things.
I enjoy watching your videos and look forward to more. I try to troubleshoot before you get to 😂 Most time I get it right Other times has nothing todo with electrical. So I get it wrong.
This is good advice. You're allowed about 3% of drop in general. I assume that means electrical parts are designed to work within that range.
Recently got my butt bit doing a voltage drop across three phase when I had 84 V on the load side 211 V on the line side.
Instead of the contactor a funny phenomenon out of the failure of an ICM 3 phase monitor.
It wasn’t a contactor that was bad the three phase monitor causes situation and the backfeeding voltage through the windings of the motor produce the scenario where the line side L one will give you your 208 V and the low side T1 would show you a greatly reduced voltage appearing as though it was a voltage drop across the contactor points.