Automatic strange noise under load, why it happens and what to do about it

Sometimes you may encounter such a problem that the machine in your shield starts to buzz or hum. In this article we will talk about what is causing these unpleasant and undesirable sounds, and most importantly, that this should be done. So, let's begin.

Extraneous sounds in the machine

In normal operation, the machine must operate absolutely silently. If there was a sound, the first thing I try to determine is heard humming or buzzing. It will depend on the further algorithm of your actions.

Circuit breaker hums

You listened and determined that your circuit breaker is buzzing (in much the same buzz when the starters and contactors). This fact directly indicates that the machine is defective or the marriage.

So with such a sound you should not bother looking for other damage and causes. This machine needs to be replaced.

We should not delay the replacement, because it is not known at what point the machine fails completely. Well, as you know, Murphy's Law has not been canceled. And it is quite possible option that one can damage the circuit breaker and neighboring machines, without any signs of defects during operation.

A source of such a machine is a drone trip coil or solenoid trip unit.

Moreover, its core is permanently positioned within the magnetic field and if it is not properly fixed, then under the influence of an electromagnetic field coil can enter into resonance and vibrates (Hum).

The main reasons for this effect are: manufacturing defects, improper transport conditions, improper storage, tampering, etc...

However, even famous brands are not immune from such.

Of course, from such troubles could well defend himself, by testing a long primary current. That's just most of us do not even think of doing such a procedure.

Machine is buzzing or crackling

So, listening to the machine, you have determined that it crackles or makes a slight buzzing. In this case you should immediately start looking for the source of the sound, because the consequences can be extremely serious.

And it all is that this is the sound of microscopic arc which is formed between the two conductive elements with bad contact.

So, first of all we are looking for the source of cod. To do this, in turn disable the machines, while the load is not removed, since it is possible with the crackling disappears.

Once found, a bursting machine, inspect it carefully. In this case, usually cause poor cod is tightened wire in the terminal.

If visual examination you did not find obvious signs of melting or heating, unplug the panel and perform broach all terminals insulated tools.

After that, reconnect the load and check that the sound was gone. If all is lost, then the problem can be considered solved with a clear conscience. But if the sound is not missing, then the machine (which pops), should be replaced.

Important. Broach all terminals must be performed at least once every six months.

The main causes of poor contact

Perhaps the only reason for poor contact is poorly carried out installation (jamb rigger), which may be about to let that happen:

Therefore trust installation in the most important unit of any wiring only reliable skill with experience. And after doing work, periodically sniffing your visor. Yes, it smells.

Because when poor contact at this point there is strong heating, which will inevitably lead to melting of the insulating material, and if you caught a scent, then immediately find the cause.

conclusion

That's all I wanted to tell you about the reasons for the buzz and cod in the machine, if the article was useful to you, then vote it Like. Take care of yourself!