Monthly Archives: February 2012

Basic Interlocking of Electrical Circuit

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 … Continue reading

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Variable Speed Drive Fault Finding

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 … Continue reading

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The Basic Operation of a Contactor

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 … Continue reading

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