Good day,
I recently did a bunch of verifications on the siemens mag 6000 remote mounted units with the siemens verificator. The verificator showed that two of my meters failed their insulation test. I ran the test another time to be sure and they still failed. I went back to site a couple days ago to do some more testing and troubleshooting.
First, it's important to note that Siemens states that resistance should be infinite (greater than 500 Megaohms) when measuring between ground and terminal 85, and between ground and terminal 86.
I tested both of the failed meter with my megger and the resistance was 4000 Megaohms for each, which is a pass according to the documentation. I decided to do a base test with the megger on a meter that passed with the verificator and I ended up getting a reading of around 115 Megaohms, mind you this is the meter that passed initial verification. Given that 115 Megaohms is not a pass, we are at a loss of to what is going on.
I also want to mention I did do the basic visual and physical inspections of the transmitters and sensors and I could not find any issues.
I recently did a bunch of verifications on the siemens mag 6000 remote mounted units with the siemens verificator. The verificator showed that two of my meters failed their insulation test. I ran the test another time to be sure and they still failed. I went back to site a couple days ago to do some more testing and troubleshooting.
First, it's important to note that Siemens states that resistance should be infinite (greater than 500 Megaohms) when measuring between ground and terminal 85, and between ground and terminal 86.
I tested both of the failed meter with my megger and the resistance was 4000 Megaohms for each, which is a pass according to the documentation. I decided to do a base test with the megger on a meter that passed with the verificator and I ended up getting a reading of around 115 Megaohms, mind you this is the meter that passed initial verification. Given that 115 Megaohms is not a pass, we are at a loss of to what is going on.
I also want to mention I did do the basic visual and physical inspections of the transmitters and sensors and I could not find any issues.