Gallery, Projects and General > How do I??

Seig C4 Electrics

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Fredbare:
Thanks John R  decided to go with 220v AC as 12v dc did not work.
Removed board from the lathe, and tested the contacts, that should be normally open, they were CLOSED, which would account for not being able to switch the lathe off normally, measured the resistance across the coil it was 14.4 K ohms.
Decided to remove the relay from the board, it was quite difficult due to the heat sink on the back being in the way, it is as big as the board,  I could not remove the heat sink because there are 7 components stuck to it with adhesive pads, and soldered to the board.
Once the relay was off the board I put 220v through the coil and the contacts closed, and opened, every time, (sods law) but I still intend to replace it.
Thanks John S the PDF is very useful, I did a search for that but could not find it.
The only place I could find a replacement is in China so I have some ordered. I have everything crossed now hoping that the relay IS the only  problem.
Will let you know how I get on.
Thanks again to both John's for your help.
John

Fredbare:
Still waiting for the relay I ordered from China, had an email from the supplier and it doesn’t look good, so I decided to go back and look at the original relay that I removed from the control board.

I connected the relay coil to a 220v supply and switching it on and off many times, it worked every time, so I decided to install it back on the board.
As it was difficult to remove from the board (due to the proximity of the heat sink), I decided to re-solder the relay to the board using cable, which will make replacement easier, and there is enough room to tuck the relay into the cabinet and refit the end cover.
 I am now up and running again, I should have thought of this weeks ago.

Now that I know that I am not restricted to fitting the exact same relay, I am  looking for one of similar spec and hopefully better quality, the only restraint is size.
4pin
220ac coil
30a contacts
However in my searches they mention latching relays,  now I am confused, what I should be looking for

John Swift:

Hi Fred

this relay from rapid online looks like the relay used on your lathe -
http://www.rapidonline.com/electronic-components/hongfa-hf105f-1-240at-1zst-136-pcb-mount-relay-240v-ac-spdt-63-1524

this one has both the N/O and N/C contacts just ignore the N/C terminal

   John

Fredbare:
Thank John,
I did see that in my search, but the description does not fit with the what's printed on the case of the relay in with the photograph, which says "coil 12vdc"

John

John Swift:
 
they have used the photo of a 12V relay but
the rapid  Order Code: 63-1524  is for the HF105F-1/240AT-1ZST

decoding the  240AT-1ZST   using
http://www.rapidonline.com/pdf/507575_da_en_01.pdf

240AT = the relay has a 240V AC coil  , without the switch common
pin 6 (near the coil terminals)

1Z = form C  the double throw / change over switch

S = plastic seal

T = AgSnO2 contacts

    John

PS

relay terminals
 

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