okay so it's Saturday morning and we're here at a farm
um and as you can see we've got it's a three phase board we've got here
and we've got the three um so we've got the four incoming supplies there and then we've got four
star delta starters and what we've had to do today is replace the old time switches so
these are the the old time switches that went there one two three and we've replaced them
with two with three new time switches it's been a bit of a game wiring up because the numbers
are completely different if you look inside they have got the the terminal number the the terminals
there but it was a little bit confusing as to which ones were which but we've done it all okay
and so now we've got the supplies coming in are off so the motors that
these are controlling won't run i'm just going to switch the board over to manual
and so manually just by simply operating this switch and what you'll see is immediately as you
turn it on this contact this this um contact will will engage and then once this engage it livens up
the coil on this time switch which controls this one once this one engages it should bring this
one on and then this one etc the problem that we have done we have found now it looks like
this time switch might be faulty as well so we'll just run through that process but what
we'll do when it comes to this one we will um we'll over we'll manually override this one
so as you can see that's pulled in the main contactor and the star contactor after a few
seconds it's now delta which has now engaged this time switch which has brought in the star
and this contactor a few seconds it will then change over to delta as you can see the coil is
now live on this one but nothing is happening on this one so the time switch is live but nothing
is is happening because it's not pulling in the um in the star so neither is it pulling in the
um the main contactor so if i just push this one in that's now engaged
and so then after a few seconds it will should then go on to this one
so now i'll push in the delta
and that's clicked in which has now operated that time switch
which is now brought in the star on this one and the contact on the left you can see and then it
will print the delta and so technically all four motors would now be running um
so i'll just undo that and then that will drop that one out as well because this one is there's
something there's a fault on this one we're thinking it's probably the time switch so by
letting go of manually letting go of that that will also drop the fourth one out so we're going
to talk to the farmer and see what they need to do we might just change this one and this one over so
at least the first three fans will work um but we're just gonna see but yeah that's basically
just what we've done today so just three stars four starters this one comes on immediately once
the delta engages it operates the coil on this one which brings in these the contactor and the star
on this once the delta comes in it then engages the coil on this one which then operates this one
at the moment this is a bit faulty if that was working properly the delta would then come in
operates the coil on the third time switch and everything should be working