How to connect a Startrite 352 ?

[cacaolat]

Hello everyone,
at first I wanted to tell that a qualified electrician will do the work, so please no worries.
We have a Startrite 352 bandsaw, we had it since 1993, but it has not been used in the last 10 years. We now want to resurrect it, but the electrician has voiced his concern that there are 2 red additional cables, and he does not know what to do with them.
Please see the photos, can you help ?

 

[Argus]

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Your pictures are not visible, but is this single or three phase?

If you care to PM I'll give you a manual with wiring diagrams in it.


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[cacaolat]

here the photos again,
I have the original manual, but cannot make much sense out of the diagram.
The machine is single phase

http://i85.photobucket.com/albums/k59/c ... trite2.jpg
http://i85.photobucket.com/albums/k59/c ... trite1.jpg

 

[Argus]

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Your pics will not be visible until you have accumulated a posting history.

There are various door and other electrical interlocks on this machine, but if your electrician cannot read a wiring diagram, then I don't know how to help you.

Get another sparks, perhaps?


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[9fingers]

With pictures now- Bob

here the photos again,
I have the original manual, but cannot make much sense out of the diagram.
The machine is single phase

http://i85.photobucket.com/albums/k59/c ... trite2.jpg
http://i85.photobucket.com/albums/k59/c ... trite1.jpg

 

[9fingers]

Are the extra wires something to do with safety cutout devices or a foot operated emergency stop switch perhaps?
Sometimes motors have a thermal cut out that connects into the NVR switch.

It is a bit worrying that a sparks can't work out what is going on! No doubt he could sign off part P compliance though!

Bob

 

[Argus]

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I can't see any spare red wires in the picture.


This saw has (as standard) an internal thermal overload on the starter, and externally, door interlocks, foot switch / brake and an emergency stop button.


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[9fingers]

I'd assumed the extra wires referred to by the OP are those from the bundle entering bottom left and not going to the rotary switch top left but to what I assume is a contactor/NVR next to the rotary switch.

Bob

 

[cacaolat]

Hi
I agree that an electrician should know this, but in this case...what can I say ? to summarise the reasons. I am working for this university, and want to reuse our old machines, to keep our small budget for other things, whilst a senior manager nearly persuaded the electrician to say the machine is too old, don't know why...
I insisted that it gets connected...so I am trying to have some back up.

 

[Argus]

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I've had a look at my saw and the bunch of reds bottom left in the flexible conduit are non standard as is the NVT that is piggy backed on the contractor.

The short, obvious answer is to follow them and to see where they go.
Determine also if the NVR is connected Normally Open (NO) or Normally Closed (NC) We can't see in the picture. It should be written on the front of the NVR.

There seems to be something external to the saw that is slaved off the contractor via the NVR - it may well have been some form of extract or dust removal.
They may also have pinched a supply and neutral from the bottom of the main switch, but again its not clear in the photo.


I hate to state the obvious, but your electrician will need to pull his finger out and show that his years of hard study were not in vain.




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[Lord Nibbo]

I'm no electrician but that transformer suggests a braked motor and all the extra contacts are either part of the door safety interlocks or it reverses the power momentarily on shut off.

 

[Digit]

If the saw was working it's probably Ok, but your sparks sounds a bit dodgy.

Roy.

 

[Argus]

I'm no electrician but that transformer suggests a braked motor and all the extra contacts are either part of the door safety interlocks or it reverses the power momentarily on shut off.

Nothing as elaborate as that, I'm afraid. After all, this is a British made machine.

The transformer feeds a low voltage control circuit.



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[dickm]

I'm puzzled - is the yellow box the supply unit from the mains? It looks the wrong shape for the switching on the saw itself. If so, then I suggest just following the "spare" red wires to see where they go.
There are (at least) two different safety systems on the 352. Older ones like mine have a mechanical interlock which trips the Novolt switch if a door is opened and a mechanical brake which is also interlocked. Later ones have microswitches on the doors for the same purpose.
But whatever you do, don't let some admin git persuade you to get rid of the saw. Except directly in to your workshop . They are fantastic machines.

 

[Digit]

If your sparks is beaten see if you can get him to produce some sort of wiring diagramme and with any sort of luck between us we'll be able to work it out for you.

Roy.

 

[dickm]

Looking at the pics again, I'm pretty sure the box is the supply unit, not the controls on the saw. Though there seems to be a NVR in the supply box as well as those on the saw, which seems a bit odd.

Like Roy says, get your sparks to trace the wires into the saw, and I'm sure someone on here will be able to tell him what to do.

In passing, it looks to me as if someone has modified the switchgear on the saw as well - early models just had single holes for the on and stop buttons, later ones usually had a standard external switch box. Your's looks as if there was a squared off hole into the column that has been covered with a blanking plate to hold the on/off buttons.

Out of interest, which University it whose admin branch is trying to waste money????

 

[Racers]

Hi, cacaolat

Should have agreed it was usless and offered to dispose of it, they are nice machines I have one, the wiring is totaly different. It looks like a new starter switch has been fitted.

Pete

 

[Digit]

Naughty Pete! :lol:

Roy.

 

[Davon]

Looks like a question for diynot.com

Davon

 

[cacaolat]

Hi, sorry, just now I realise that some things may not be clear on the photos. The yellow box is at the lower back of the machine. The bunch of 5 cables exits the machine and then it has been cut off.
On the door of that yellow box is another on/off turn switch. (when the door is closed it goes on the white thing on the top left of the image)