THE MEG! ( Fluke 1507) insulation meter in the field use and review HVAC
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- Опубликовано: 8 авг 2021
- A good insulation meter is a must have for guys checking critical equipment and conductor testing. Always invest into great tools in return you will have great results. Insulation testers i suggest other than Fluke, Megger, Extech, Amprobe. Demo on using this meter on a refrigerant circuit containing 3 compressors.
#FLUKE
#HVAC
#MEGGER
#MQUAY
#DAIKIN
#VETOTP4B 
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Really enjoyed the video. Thank you
You only have to test one winding as they are connected together , saves time.
Amazing thank you for sharing
Thanks for sharing
Nice!
IMO the fluke 1587 is the meter to go into commercial/industrial hvac.
This 1507 is a high quality megommeter.
Shouldn't the grounds be disconnected. If there was a short to ground on one of the phases it would be sending it back to the building.
The meter doesn’t send enough to affect a building ground. It stops even raising the voltage once it senses a low enough resistance. Even when set to 1000 V it’ll sometimes stop at like 2-3 V.
Do you have to do test between windings? L1 to L2, L2 to L3. L1 to L3 as well ? Just curious.
On a compressor or motor any leg to leg will show bad insulation, it’s fine to do all 3 but will take a little longer. also check line wiring from your contactor or source, you will need to isolate these wires from the source and each either and check each leg by them selves to ground.
@@hvacslayer2929 ok. I am doing generators megger test and my company, gives me instructions:
1. Lines to the Ground.
2. Between the lines.
Tnx for content and response
What's the part number for the test button test lead?
Fluke TP165x
@@hvacslayer2929 can you add the black lead to. Any ground or does it have to be ground on the device your checking?
@@TheDodgers805 Any good ground connection.
You CAN’T get the same results with a ohm meter. An ohm meter is using 9 volt at best, I have had units that test good no ohm to earth and I test with a Megger at 500 volts and it’s shorted to earth. I honestly don’t know how someone can get accurate results with out one. Also great for testing wiring and other loads to earth when a breaker is tripping.
I have come to the point of buying one, did follow up tests with this meter in blower motors on Ahu’s especially carrier units.
Other techs diagnosed other issues an or just walked away an left after replacing contractors relays an wires!
These were small motors.
Is that a mcquay air cooled?
It’s a RTU non chiller.
I disagree with you about using 500v only. Even the manual will tell you tonuse double the voltage the equipment runs on. 208v ya use 500v. 460v use 1000v
I was doing that at first as well until I met a mechanic who rebuilds motors and compressors and an electrical specialist tech who does data and monitoring in main power feeds. The mechanic told me our compressors and motors are only taking in voltages at 460, if the equipment can’t hold a test of 500v what makes you think it will in 1000v. The electrician advised me on any conductor testing only, Isolated from equipment you would double it and anything under 3 meg is a fail.
@@hvacslayer2929 🤔
@@hvacslayer2929Just the peak to peak voltage on nominal 480 VAC is 680 V, with allowable peaks up to 746 V. There are some faults that could potentially be found at 1000 V that wouldn’t be found at 500 V.
Also, Copeland states a failed Meg reading of
@@Ak3rn0 how do you clean and dry out a compressor ?
@@hvacslayer2929 Replace oil, filter dryer, etc
so you're telling me, you fail motors that read less than 100Megohm? mate.. that's fucked up. anything over 1Megohm is classed as safe from potential for short circuiting to earth. I feel sorry for all the customers you've ripped off because their equipment has tested less than 100Megohm.
Depending on the conditions if the windings are saturated or not anything under 100meg is low. I didn’t not say to condemn but to keep an eye on it. If your windings are wet you’ll be chasing needle in a hay stack. Could 5meg compressor run for few years sure will it burn out possibly that’s between you and the customer.
I watched a vid before where the guy failed the old motor at just over 1MOhm, and i thought the same thing, so theres a couple of things to check, some motors and pcbs have a phase to earth leak, its necessarary for the unit to run, and alot do not have this also, you need to know that machine before you make calls, next if the unit runs, you take current readings over each of the windings, and if your meter can do it, get in rush current measurements,
In my opinion, id go with the motor needing the carbon cleaned off it, and the armature or stator given a blowout, make sure the moisture in the air isnt a concern could be another annoying distraction to good readings, i dont think motors are hard to diagnose, but us tradesmen need to pretty much carry out a real health check of the installed motor to be fair to it, you can usually hear a bad motor, or its an obvious issue, be it a capactor, contacts or the windings (for electrical faults) mechanical issues like fan imbalance, poor bearings, loose mountings or poor springs. But doing the checks and comparing them over time usually gives us the best method of prevention, we aim to work ourselves out of a job, id love to see northern hemisphere electrical standards, but yeah, we have 1MOhm for insulation resistance, and less than 1Ohm earth lead to appliance for the compliance, 1 ohm is going to quickly trigger an mcb, you still have 100001 ohms before the system trips on a ground fault, in 0.3 milliseconds, and if your rate of decay in the motor is (i dunno) 10Mohms your technically safe for 10 years..but compliance wants to have that safety margin… i guess it makes up for bad insulation testers or the tradesmen that cant understand the test.
Anyway, hi from NZ,
Не интересно надо было показать, не очень хороший компрессор
The video was about the meter overall and it’s uses on live equipment. This wasn’t a Bad compressor/Meg video.
You talk unnecessarily way too much! You keep starting to do something then stop. It can be an annoyance and a hindrance to learning from you.
Thank you for the feedback