Electronize speedo

[woody]

This is a real long shot.
Theres a remote possibilty that the pink isnt the common wire .....have you tried testing for potential using using the green as the common?

[philip_taylor]

Thanks again for your help.

The relays are Narva 68048 http://www.narva.com.au/Switches_Relays_1.htmlhttp://www.narva.com.au/Switches_Relays_1.html

The relay did not click at all before the pink/yellow circuit on the controller stopped working.

I followed the instructions given by David Mainprize to wire the external relays. Here is a picture of the wiring http://robowars.org/forum/album_pic.php?pic_id=1386http://robowars.org/forum/album_pic.php?pic_id=1386 Here is a picture of the circuit diagram for the relay http://robowars.org/forum/album_pic.php?pic_id=1387http://robowars.org/forum/album_pic.php?pic_id=1387

I wired the relays onto the wires that Electronize had supplied. They were installed onto the circuit board. I plugged the controller to my receiver and powered up the receiver. I attached an 18 v battery to the inputs of the Electronize. I had my multimeter on the outputs of the relays, pin 30. I found that I had voltage when I moved the lever on my transmitter in one direction, but there was no voltage when I moved the stick in the other direction.

I tried reversing the polarity on 85 and 86 of both relays. I then tested the voltage across pink/green and pink/yellow and found that pink yellow was not working.

I tested another speedo without attaching the external relays. There was variable voltage coming from the heavy blue/yellow wires and there was potential voltage on pink/green and pink/yellow. I attached the external relays to this speedo and got the same result. That is, the pink/yellow circuit stopped working.

Before the modification, pink was definitely the common wire.

The Electronize were working fine for me for the last three or so years before this.

[woody]

Do your relays have pictures of diodes on the body?
If they have then you mustnt follow the wiring PICTURE ......you must follow the NUMBERS.

You have one relay that works ......and pink is connected to what number .. 85..? ......The pink wire MUST be connected to the SAME NUMBER on the other relay.

Youd have been fine picking the resistance relay option :sad:

[woody]

I suppose your thinking ... why does Davids work ... he used the same relays!
I strongly suspect that he tested the relays by connecting them across a 12v battery ..... thus blowing either one or both of the diodes..... ( diodes invariably blow open circuit).....so he was lucky.
So ...... ( adds get out clause )..Im fairly sure that YOU should attach the pink to 85 on BOTH relays.
Alternatively you could try removing or blowing the diodes.

[woody]

Tsk ....Ive just re-read Phils post and believe that the pictures are of his relays rather than pertaining to the instructions given by David .
Ignore the erroneous references Ive made to Dave.

Woody

[Mouldy]

Philip, Electronize will get it repaired for under £10. More expensive, but alot less trouble.

[philip_taylor]

I am thinking of sending all four back to Electronize and getting the internal relays put into them. The only thing that makes me want to try to get two of these working is that the last time I sent them over, it took three months to get them back. The length of time taken may have had something to do with Christmas.

The pictures above are my attempt at wiring. Dave provided a diagram with the colours of the wires drawn in and the pin numbers marked.

[Mouldy]

Wierd, i had my exsternals back within a week or two. Probably to do with the postal service, Electronize as a company are pretty reliable.

[grant_ploughbot]

i know that around christmas they were VERY busy.

[woody]

Phil ...Ive uploaded a modified picture... on my profile ...of how I think you should wire in your relays .. taking into consideration the diodes.
Note:- Im assuming that the green / pink combo is correct .....seeing as how it worked in both attempts.

(Message edited by woody on January 29, 2007)