It's late here, I'm about to go to bed, but before I do, I want to shout out to all the useless
"electricians" that can't be bothered to use a simple EMC cable gland when they replace an electric motor that
quite obviously uses a screened cable.
I was awoken this morning at 4am by a customer of mine that shouted down the phone at me that a section of his plant had stopped working.
After the usual questions I went and had a look.
Now, this guy has a number of different people doing his work in various parts of the factory.
I got out there and the rotational moulding section of the plant wouldn't work at all.
The guy said to me, "We had this motor here replaced yesterday", I took one look at it and said that is the problem.
Turned the motor off and everything else started working.
It had a plastic cable gland where the supply cable went into it.
What a donkey.
If gear uses a Variable Speed Drive (VFD if you will), you have to use screened cable and glands.
If you don't, however, the HASH that comes out of them can stop adjacent equipment, the cable becomes a large antenna with all sorts of noise being radiated in all directions.
Tell your co-workers, because that is a "break-down" that should never have happened.
Has anyone here struck the same thing before?