Scheppach ts2500 Ci query

[bluenose]

Hello folks, I have a query regarding my Scheppach ts 2500 Ci table saw. For a couple of weeks now I have been having intermittent problems with the start-up. I can be using the machine for 20 minutes or so and, when I return to the machine it will not start up. I have checked the supply cables (I have even had an electrician check them for me) and the power is getting to the switch ok. I have taken the switch apart and there are no loose connections anywhere ( the electrician checked this too) I put the switch back together and often the machine will start up straightaway. Over the past couple of weeks I have done this on probably 7 or 8 occasions and it has started up ok. I have probably had a similar number of occasions where it has refused to start and, that is the case this afternoon.
I have spoken to the techie boys that deal with the machine but they haven't come up with an answer. I don't think that it is the capacitor as the techies say that it would make a whirring sound without kicking in if it was at fault. I don't want to purchase any parts just yet as I don't know exactly what the problem is.

I am wondering if anyone else has experienced a similar problem and have managed to resolve it.

Thanks in advance of any thoughts.

 

[Myfordman]

1. Change your electrician! One that fails to diagnose a problem does not deserve that title.

What does it do on the occasions when it does not start?

If it has a full DOL starter, will it start if you move the contact block manually - (with a wooden stick or other insulating pusher)

If it starts manually, does it continue to run when you take the stick away or does it stop again?

 

[bluenose]

1. Change your electrician! One that fails to diagnose a problem does not deserve that title.

What does it do on the occasions when it does not start?

If it has a full DOL starter, will it start if you move the contact block manually - (with a wooden stick or other insulating pusher)

If it starts manually, does it continue to run when you take the stick away or does it stop again?

When I press the green start button absolutely nothing happens, no sounds, no clicking.....nothing.

What is a full DOL starter ? The green button does move the inner contact, I can see that when I take the switch apart. I haven't tried to get it going manually with a stick though.

Thanks for trying to help, much appreciated.

 

[Myfordman]

Google images for a DOL starter. Basically a large box with stop and start switches on the front/lid that control a multipole contactor inside.

"moving an inner contact" sounds like it may not be a DOL starter.

The other sort of stop start NVR switch looks like this http://www.axminster.co.uk/axminster-ax ... prod21280/

With the latter you can't access the contacts to work them manually.


It sounds to me like the stop switch maybe open circuit when the motor fails to start (this is a normally closed contact pair) or if you have any safety interlocks fitted such as on a door to access the motor or to make sure a guard is fitted, that these switches are not closing properly. Normal cause for this dust having worked its way into the contacts. Compressed air will usually dislodge it.

I've just been looking at pictures of the Scheppach saw and the switch looks nearer to the axminster style than a full DOL. I would plump for dust being the cause especially seeing where it is located.
If you conclude that the switch is duff and cannot be cleaned, fitting a full DOL switch will cost about £30 (from Toolstation) - likely to be cheaper than a new scheppach part and you can get rid of that awful euro plug power input at the same time.

 

[bluenose]

Google images for a DOL starter. Basically a large box with stop and start switches on the front/lid that control a multipole contactor inside.

"moving an inner contact" sounds like it may not be a DOL starter.

The other sort of stop start NVR switch looks like this http://www.axminster.co.uk/axminster-ax ... prod21280/

With the latter you can't access the contacts to work them manually.


It sounds to me like the stop switch maybe open circuit when the motor fails to start (this is a normally closed contact pair) or if you have any safety interlocks fitted such as on a door to access the motor or to make sure a guard is fitted, that these switches are not closing properly. Normal cause for this dust having worked its way into the contacts. Compressed air will usually dislodge it.

I've just been looking at pictures of the Scheppach saw and the switch looks nearer to the axminster style than a full DOL. I would plump for dust being the cause especially seeing where it is located.
If you conclude that the switch is duff and cannot be cleaned, fitting a full DOL switch will cost about £30 (from Toolstation) - likely to be cheaper than a new scheppach part and you can get rid of that awful euro plug power input at the same time.

Hello again, thank you so much for trying to help with this problem. The switch box has green and red buttons on the front of it. When I take it apart, in the first section is a small circuit board with lots of very small transistors on it (at least I think that they are transistors), there is also a very small clear glass fuse which is intact., when I open up the second part where all of the cables go through from the circuit board there is a brown plastic block on which is mounted the mechanism that is pushed in when the green button is pressed, when this contact goes in, there is a block of white plastic that protrudes slightly in front of the red button that is seemingly ready for when you press the red button to switch the machine off. The inside of the switch is absolutely spotless and there is no sign of any dust whatsoever. This morning, I needed to use the saw and it took me three openings of the switch and putting it back together before it started up. You are being extremely helpful in your efforts to help me and I am wondering if it might help if I posted a photograph of the switch mechanism, this would give you a better idea of what the switch looks like, assuming I can remember how to post a picky on here. Thanks again.

 

[Myfordman]

I'm afraid that your saw is of the age where all sorts of non standard 'features' have been added by the manufacturer in attempts to provide things like soft start and braking. They doing this to mid market machines hoping to make them attractive to semi professional users who need to meet PUWR regulations.
Due to the non standard nature of these circuits, users are at the mercy of the manufacturers when they go wrong.
There is a member here named something like manatmna who works for the scheppach dealers MNA. He may be able to help you.

Sorry to bale out but I can only help remotely when standard parts are used.

 

[bluenose]

I'm afraid that your saw is of the age where all sorts of non standard 'features' have been added by the manufacturer in attempts to provide things like soft start and braking. They doing this to mid market machines hoping to make them attractive to semi professional users who need to meet PUWR regulations.
Due to the non standard nature of these circuits, users are at the mercy of the manufacturers when they go wrong.
There is a member here named something like manatmna who works for the scheppach dealers MNA. He may be able to help you.

Sorry to bale out but I can only help remotely when standard parts are used.

Ok Myfordman, many many thanks for trying though. I did do a search for 'manatmna' but didn't come up with anything.. The problem is so very frustrating as I know that taking the switch apart and then putting it back together will eventually get it going again, even though I don't do anything to the switch when it is apart!! Thanks again.

 

[Myfordman]

Here he is member233.html