We have covered a few items during the posts on fault finding and I think we should consider something else you will encounter on circuits namely, Interlocking. Reality is that it means one thing needs to happen before the next one can or if one thing has happened, the next one can’t. Sound complicated? It …
Quite often you will come across an installation that has a variable speed drive in the panel. When you need to find a fault here, check the display on the drive and act on it. It is very easy to ignore the message and assume the drive is faulty. Fact is, normally the drive has …
In the last post I took the control circuit through to the contactor coil for the purpose of fault finding. What we need to look at briefly is the operation of the contactor. As you saw in the sketch of the control circuit, we followed the circuit through to the coil. What happens once we …