I'd like to make a correction. Anything less than 1 Megaohm is considered a failure, while in reality, I've seen motors run with less than that. 50 Megaohms is a very good reading.
I'm glad that someone has enough knowledge to not use a Supco merger on a Copeland Scroll compressor. People need to read Copelands ligature about megging their scroll compressors. I'm sure there have been many of the Copeland scroll compressors that were still good but were replaced by using the Supco meggers.
@@hvacwilly6037 Supco Meggers are ok for what you said, for reciprocating compressors but for scroll's I would not use them. For some reason they have made them that they will not read low enough. I've condemned a couple Copeland compressors when the Supco merger said that it was bad, until I read the Copeland literature on their scroll compressors. What I use is a cheap $45.00 Chinese merger I got off of Amazon. They are as accurate as a Fluke merger, just don't trust the voltage readings. I've been using one for about 8 years and it has been accurate so far.
It is not a 2 phase compressor. It is a single phase compressor at 240 volts. Both hot legs are center tapped in the distribution transformer as a delta configuration to create the neutral for 240 volts, hot to neutral is 120 volts. If it were derived from a wye configuration, it would be 120/208 volts the common from both legs is the neutral
I have always tested motor windings via ohm it out, either by terminal to terminal or terminal to ground. 3 ph motors should be equal ohms reading if normal, or tested via terminal to ground. Single phase motors. Ohm out between terminal to terminal first. Good windings should like example: R to S =9 ohms R to C = 3 ohms and S to C = 6 ohms mean normal. Also do the same with 3 phase by terminal ground. If shorted to ground the ohm meter will read something.
Insulation tester tests winding insulation by applying DC voltage through the winding & Multimeter measures the resistance of winding. Insulation tester gives an accurate and fast measurement to verify the condition of insulation.
There's 2 seperate ways to check a motor. Using a normal multimeter that only outputs a few volts and a mega ohm meter that can output 1000v. The higher voltage will check if the insulation is cracked anywhere and leaking power to ground. It can detect shorts through bad refrigerant full of acids inside the compressor.
No, with a multimeter, you could only test to see if the compressor is grounded or not! An insulation tester will test the condition of the insulation on windings, whether it is good or bad or on its way out!
Don't think your getting on the conductors good. The holes where the screws go in are not the conductors, it's the metal tabs around them. Also Copeland doesn't recommend to meg ohm their scroll compressors. Something about the windings being too close to the shell.
I had a very good connection and the holes that where screws go in are conductors as well! An insulation tester measures the resistance of the windings! There is no such thing that you can't use an insulation tester on Copeland Scroll Compressors!
Thank you so much for sharing the knowledge 👍
Great, you explain it in a simple way to understand,i gain knowledge to it, never mind the feeling genius comment,good job.
Shering very good welcome allgues best fulcomecome careful serching and jobd anyway outdide es good sllthd time
I'd like to make a correction. Anything less than 1 Megaohm is considered a failure, while in reality, I've seen motors run with less than that. 50 Megaohms is a very good reading.
Thanks for easy explanstion
Very good video..
I'm glad that someone has enough knowledge to not use a Supco merger on a Copeland Scroll compressor. People need to read Copelands ligature about megging their scroll compressors. I'm sure there have been many of the Copeland scroll compressors that were still good but were replaced by using the Supco meggers.
I have the Supco Megger. I don’t trust that thing. Isn’t it only good for like small fan motors/ small reach in compressors ?
@@hvacwilly6037 Supco Meggers are ok for what you said, for reciprocating compressors but for scroll's I would not use them. For some reason they have made them that they will not read low enough. I've condemned a couple Copeland compressors when the Supco merger said that it was bad, until I read the Copeland literature on their scroll compressors. What I use is a cheap $45.00 Chinese merger I got off of Amazon. They are as accurate as a Fluke merger, just don't trust the voltage readings. I've been using one for about 8 years and it has been accurate so far.
What is acceptable value insulation resistance minimum in compressor
You should measure insulation with double voltage of operational voltage.
So there's a single phase 220 compressor I should be testing at 500 V.
@@deddie4645 Exactly
Says who ?
@@xraybravo7180 Proffesion
It is not a 2 phase compressor. It is a single phase compressor at 240 volts. Both hot legs are center tapped in the distribution transformer as a delta configuration to create the neutral for 240 volts, hot to neutral is 120 volts. If it were derived from a wye configuration, it would be 120/208 volts the common from both legs is the neutral
??? It is a 3 phase 575 v Scroll compressor!
He said it was a 3 phase compressor.
I have always tested motor windings via ohm it out, either by terminal to terminal or terminal to ground.
3 ph motors should be equal ohms reading if normal, or tested via terminal to ground.
Single phase motors.
Ohm out between terminal to terminal first.
Good windings should like example: R to S =9 ohms
R to C = 3 ohms and S to C = 6 ohms mean normal.
Also do the same with 3 phase by terminal ground. If shorted to ground the ohm meter will read something.
Insulation tester tests winding insulation by applying DC voltage through the winding & Multimeter measures the resistance of winding. Insulation tester gives an accurate and fast measurement to verify the condition of insulation.
There's 2 seperate ways to check a motor. Using a normal multimeter that only outputs a few volts and a mega ohm meter that can output 1000v. The higher voltage will check if the insulation is cracked anywhere and leaking power to ground. It can detect shorts through bad refrigerant full of acids inside the compressor.
Is this compressor what is acceptable resistance value good and bad
Great 👍
Would u test between N & L on a motor or just phases? And phases & Earth
Good question I’m not sure. But would like to know the answer also
You can't test between N&L because there's load there, not an open. A megger tests how good an OPEN is.
👍👍👍🙏🙏🙏🙏🙏
Please, can i do the same test with Fluke 115 multimeter?
No, with a multimeter, you could only test to see if the compressor is grounded or not! An insulation tester will test the condition of the insulation on windings, whether it is good or bad or on its way out!
👍👍
Would one of you you 2 people at least give the same information you tested the same voltage or test it at double the voltage ratedV
Who wa t to swap Fluke 87 V MAX with Fluke 1507
so, technically a third of that compressor is still good. put it back in and send it!
Bro!!! That was a bad as video!!! Keep going!!!
LMHO.
Don't think your getting on the conductors good. The holes where the screws go in are not the conductors, it's the metal tabs around them. Also Copeland doesn't recommend to meg ohm their scroll compressors. Something about the windings being too close to the shell.
I had a very good connection and the holes that where screws go in are conductors as well! An insulation tester measures the resistance of the windings! There is no such thing that you can't use an insulation tester on Copeland Scroll Compressors!