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The Sajo mill is here

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Bernd:
This is a bit amazing to me. They are using 220volt control circuit. One would think that they would have used some smaller voltage. But anyway I ramble.

It looks like your PB1 should only have two wires on it. If there are more than I'd say there is a wiring problem. The parts labled OL1, OL2, etc. are the motor overloads. If the amparge is exceeded on any of these the machine goes into "emergency stop". I would find one of those OL's in the panel box. They should be able to be tripped manually. If they can try one. The machine should shut down. If it does and nothing else turns off, like you descibrd before then I'd say your PB1 is the sorurce of your problem.

One of the reasons I'm so interested in this is that I used to do a bit of trouble shooting on the machines in the place I worked at. Used to do it over the phone sometimes. So I want to see if I can trouble shoot a machine via the internet. Call it a challenge.  :smart:

Bernd

AdeV:
Is it possible that when PB1 is released, it's causing a spike in transformer T1, which is tripping the ELCB? Or, maybe PB1 is faulty, and is (briefly, perhaps) connecting live to earth as it disconnects, again tripping the ELCB. I presume that PB1 is earthed on its chassis.

andyf:

--- Quote from: Trion on March 02, 2010, 11:28:38 AM ---I must admit, I dont understand squat of the drawings and stuff posted. 3-phase is still just a word to me...
On another note, I have made a small investments during the recent days .....
Yup, it's a 2mm thick rubber foil which is going to be my combined y-z-axis way cover!

--- End quote ---

Until the electrical problem is solved, it might be a good idea to put the rubber mat on the floor and stand on it  :lol:

Andy

John Hill:
Here is something you could try...

Run the machine and stop it with the emergency stop button.  

Then unplug the machine and test for continuity (i.e. resistance) between the earth pin of the plug and each of the other two lines.

There should be no circuit between earth and phase pin.

There should be no circuit between earth and neutral.

There should be no circuit either between phase and neutral when everything is turned off.

There MUST be a circuit between the earth pin and the exposed metal of the machine.

If it fails any of these tests it is unsafe and the attendance of an expert is required, in my opinion.

I suspect that whatever is happening it is just a very short spike on the earth lead which your earth leakage circuit breaker is sensitive to.  The pulse is probably coming from the collapse of magnetic fields in motors or relay coils.

An easy solution may be to put some ferrite beads on the earth lead,  you can buy these and you might have seen them moulded on to the cable to VDU displays etc.

Darren:
Is there a neutral, how are the two transformers fed?

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