The Big Red Mechmate in Aus

[ozspeedway]

One other thing with this/these damn safety relays, it says in the tech docs; DC: Connect terminal A2 (-) with the earthed side of the operating voltage. What the hell does that mean? And what is that terminal marked (-) with the ground symbol on it used for?

WHat worries me in all this is that the description for the PNOZ 1 says "earth faults are detected in the emergency stop circuit" whereas something like a PNOZ 4 does not say that. Could this be part of my problems? Very tempted to buy a PNOZ 4 instead but not until I have exhausted all avenues with these PNOZ 1's

[Web Goblin]

The terminal marked (-) with the ground symbol is connected to ground. Are you sure the relay you have is the correct supply voltage?
With the supply voltage on you should be able to measure voltage between T11 or T33 and (-) ground symbol connector. As you say linking T11 to T12 and T22 should supply power to the relay coils. Linking X1 and X2 provides the link for the reset. So you should be able to press the reset button, link between T33 and T34, with the power on and the relay should work.
More info here : http://www.google.co.uk/url?url=http...nN3ImeJyLyD7tw

[ozspeedway]

Web Goblin... you have solved it! The stupid hat goes to me. I have infact now got 2 PNOZ 1 relays that require 24VAC not 24VDC and that puts both of them totally useless to me. I will contact the ebay seller once again and see if I can send them both back and get a 24VDC PNOZ 4. Barrring that a quick toroid supply making 24VAC just for the PNOZ might be in order.

[ozspeedway]

OK, it is cheaper for me to just go buy a 12VAC + 12VAC toroid and use that for the relay plus it will allow me to continue the control box this weekend rather than next week sometime. I can get either a straight toroid or a PCB mounted 24VAC supply, will decide which when I get to the store.

More updates to follow once I have the relay powered off the correct voltage type :)

[Web Goblin]

Glad it helped you out, we all get a shot of the hat sometimes . I would go for the 24VAC option for the relay supply.
As you say it will let you continue with your build.

[ozspeedway]

Well, surprise, surprise. When you supply the PNOZ with the correct voltage type it works :) Nice "ker-chunk" from the relay when pressing reset and 2 led's all lit up. I now have 2, one spare, one in the control box. Off to do more control box wiring, getting closer to the BRMM (Big Red Mechmate) moving on its own.......

[ozspeedway]

This is a question for either Eddy Current or anyone that knows his safety circuit. I have attached what I think is correct for adapting the circuit on sheet 4 of Eddy's drawings to a Mechmate. As some of you may know, Mechmate's have mini control boxes attached to the machine, one each side of the gantry (X1 & X2) and one on the Y car. These give you access to any control while working around the machine. As can be seen in the attached drawing I have separated out the reset/start, stop & pause buttons into the 3 sections that will reside at each of the points above. It is this wiring I would like checked as to my tired eyes it looks to conform with Eddy's drawing only with parts of it in triplicate. Bottom line, am I on the right track :)



Cheers
Bruce