[MUSIC PLAYING]
Hi.
I'm Larry Nilles of Schneider Electric.
I'm the product manager for the Square D brand of NEMA-rated type S starters.
Today I'd like to demonstrate how to properly install a melting alloy
overload relay into the starter.
And in addition to that, we're going to put auxiliary contacts
on the side of the starter itself.
I have before me a Square D type S NEMA size 1 melting alloy starter.
What makes it a melting alloy starter is the overload relay block.
This particular overload relay block currently
has two thermal elements installed.
This is what a thermal element will look like before installation.
And the third cavity will have the two screws to affix the thermal element
in the overload relay block.
I'm using a 3/16-inch screwdriver, and I also have a torque screwdriver
to torque the screws down at the end.
So let's remove the screws and begin installing the overload.
So the two screws come out.
I've loosened them a little bit for time purposes again.
And we need to look at the overload relay, the thermal element itself, so
that we understand what we're trying to accomplish.
Right here we have something we refer to as a star wheel.
This star wheel is connected to a shaft that will go into a solder pot.
And in that solder pot is the solder.
That will hold the shaft attached to that star wheel.
It will prevent it from turning.
If we have an overload condition, we generate too much current,
the current creates heat.
It will melt the specific melting point of the solder.
It will turn the star wheel, and it will trip the overload.
The way the overload works is that we have
[? Pall ?] arms that are held in place by this particular star wheel.
They will engage an auxiliary contact block,
which is a normally open, held closed auxiliary contact block.
The coils are wired through that auxiliary contact block.
So if we would happen to trip, we would open that contact block,
it would drop the coils out, and your motor would stop.
So even though it seems as though it's a relatively simple procedure
to put in a thermal element, it can be installed incorrectly.
The [? Pall ?] arm in this case is in the uppermost position.
I can mistakenly put in the thermal element with the [? Pall ?] arm
in the correct position on the bottom, and it will not function properly
in that particular instance.
So what I want to do is show you how to do it correctly.
I'll pull out my thermal element again.
The easiest way is to hold the [? Pall ?]
arm a little bit in the uppermost position
and drop the thermal element into the cavity.
Once it's in the cavity, we can take the screws and fasten them.
Because it's a little cumbersome to use a torque screwdriver,
I'm going to use a regular screwdriver to just torque them up a little bit.
And then I'll use the torque screwdriver to get it to the appropriate settings.
Each screw on this starter has an appropriate torque setting.
The fasteners for the thermal element is a 9- to 16-inch pound.
So I'm torquing that.
I will tighten it until you hear the torque driver ratchet.
When it begins to ratchet, we know it's tightened to the appropriate torque
setting.
So now we have the three thermal elements installed.
The last thing we would want to do is reset the starter.
All three [? Pall ?] arms now are engaged into the star
wheel of the thermal element.
We're ready to run the motor.
If we start the motor now, and we would create an over current,
one of the star wheels would begin to turn.
The [? Pall ?] arm would come up, and it would open the auxiliary contact,
dropping the coil out.
So let's begin by putting in our field installable auxiliary contact blocks.
Here I have a kit, catalog number 9999SX8.
It has one normally open and one normally closed auxiliary contact.
They will be affixed to the side of the starter.
So we have a mounting block.
We have two auxiliary contacts.
So the first thing we'll want to do is mount the auxiliary contact block
on the mounting plate.
So we just slide it on.
It's one screw that will hold it in place.
We'll load the second one exactly in the same fashion.
So now that the auxiliary contacts are mounted to the mounting plate,
I have two screws that I will screw into the starter itself
to hold it on the plate.
So let's do this.
And then I'm going to turn it to my side so that I can
screw the screws a little bit easier.
And the top screw.
And now that's what the starter will look like with the auxiliary contact
blocks on.
We want to make sure that they're engaged properly.
We have a tab on the top that we can engage the coil.
Move the contacts, and we can see that the auxiliary contacts themselves
are changing state by the movement of the levers on the contacts.
So now we have two auxiliary contacts installed on this starter.
Thank you for joining us today.
If you would like more information on these products,
please look for it on our website.
Thank you.
[MUSIC PLAYING]