i am back with Matt Matts got a motor yep but what are we doing today
so like on a previous video where we looked at a single phase motor controlled by this
side of the circuit the direct online starter this time we are looking at a
three-phase direct online starter controlling a three-phase motor so if i press the start button
and then and stop so in that video we looked at all the connections within the starter for a
single phase direct online we think and it will evolve over time the AM2 and AM2S have a
three okay and you're gonna expect it to connect that up and obviously then you're
expected to test it in this video matt's gonna go through all the connections that are made
in order to energize our three-phase motors yes so we've safely isolated the circuit so
we're not live we've got the cover off there isn't as many conductors as i'm expecting to
see in there considering it's three phase Matt can you go through what's going on in here
okay i guess so being three phase it's actually looks a lot more simpler so we've got
our contacts here number one three and five okay yeah and we have just our phases one two and three
simply coming into those contacts so three phase supply L1 L2 and L3 coming in that's it and
they're coming into numbers one number three and number five so that's our 400 volt supply coming
in that's it and then on the outgoing side on terminals two four and six okay are our
our conductors that go down to the motor so down the bottom here two four and six they go straight
down to that three-phase motor so come through through the contactor through the overload and
straight down to the motor simple so like on the previous video where we had to loop the neutral
this time there's none of that okay because all three conductors go straight through everything
so in the previous video we looked at a single phase direct online start we did something quite
fancy with the neutral recommend you look at that video this is quite simple we come through the
three lines at the top come in and the three lines go out at the bottom okay okay so let's carry on
then from here so we take another live feed going across to number 13 exactly the same as if it was
single phase did it have to be coming out of the uh number one terminal or could it come out sorry
it didn't matter which one it comes out it doesn't matter no it can come out of any of them yes again
it then comes from 13 the retaining contact yep through to the start okay so this this would be
the button that i pressed on the front of it that was green actually start button i'm taking the red
one down here was my stop so we've come from the back we've brought a line through to number 17.
how is the start button connected so again the start button both 17 and 18 are connected
in parallel with the retaining contacts numbers 13 and 14. okay brilliant so again we have a
permanent live feed here here and here okay brilliant again as previously we then take
a conductor from number 18 like on the diagram in the classroom where it went to the stop button yes
the stop button here is built into the overload relay so we we're going back to that original um
single phase one here which we did a drawing on we're still coming out of 18 there is no stop
button here as we did on a drawing it's actually built into here so we come out of number 18 and
we go to 95 90 again 95 or 90. it doesn't matter okay we'll go keep it in order so we go into 95.
okay again we come out of yes and then that loops all the way back around as as the same into the A1
termination of the coil so at the back here is the line conductor for the coil yes so in order to
magnetize that coil we must put a neutral on the other side and that comes out of is that A2
out of A2 so we've got a neutral there from the supply so the three lines coming in
in one three and five and the neutral was connected at the back in the A2 terminal
by having a line and neutral across the coil once the coil is energized it creates a magnetic field
and is that when we hear that clunking noise in this portion and that's where you hear that
clunking noise as it pulls in okay one thing just to mention on this one this one is a
it's wired up three phase yes but it's a 240 volt coil okay do they do a 400 volt
coil there you also do a 400 volt coil okay so we'll talk about that another time but this case
is a 230 volt or 240 volt coil okay so that's fine and we're happy and comfortable with that
when we've got our wiring in place we've got some other bits and bobs going on in the overload here
is this overload interchangeable can i disconnect it and perhaps change it to match the rated value
of the motor below exactly yeah exactly the same as uh as as whatever whatever overload
setting you need this one again is 13 amps yes if it's only a small as a three kilowatt motor you
don't need a rating of 13 amps on there if it's a three phase okay so so it's exactly the same again
there's the little arrow head there to adjust it with your screwdriver okay this acts as the stop
button which is connected to the which is linked to the stop button on the actual front cover this
button here is the is the reset button so if it does trip so when you say trip we're talking about
the motor below say was a 10 amp it was overloaded that we put too much stress on the motor started
to draw 16 17 amps yes it's this that trips out preventing obviously damage to the motor below
just a quick one for those people doing am2 and m2s it's vitally important you set this
to the specification of the job or the rated value of the motor that's suggested in the paperwork or
moving forward you might even have to calculate the current of the motor and set the overload
according to that value it's very important that you set it yes okay and guys so you said about the
three-phase motor set in the overload relay yes remember with a when we calculate the the current
on a three-phase yup circuit yes the equation is slightly different to the single phase circuit
so you need to check that out and make sure that you know what you're doing with that and that's
something that you'll cover for our learners in the classroom i'm sure the lecturer of the person
who's watching this will also cover that yeah so the connections in here are more simple than i
thought they were going to be okay effectively the three lines just come through we've got a 240 volt
coil which we've got neutral on one side and the line on the other side and we've talked about the
importance of setting the overload and the reset button i think we've covered everything we need
i think so Gaz so shall we end it as we normally do okay so i'm in England and Matts in Australia
so he maybe slightly delayed when this kicks in so I hope this video has been some help