What changes are needed for XMUS 16CH in Australia?

[DeanCollins]

Hey Guys,
Just wondering what needs to be changed to run a XMUS board here in australia? I am unsure of the voltages I will be using but it will be one/two of the following.
24V, 36V or 240V

I have been told that the resistors going to the H1AA1 need to be changed but I am unsure of what values.

Thanks.
-Dean

[xmus]

Hey Guys,
Just wondering what needs to be changed to run a XMUS board here in australia? I am unsure of the voltages I will be using but it will be one/two of the following.
24V, 36V or 240V

I have been told that the resistors going to the H1AA1 need to be changed but I am unsure of what values.

Thanks.
-Dean

double the value of those resistors. And if I am not mistaken, double the rating as well. Currently they are 1/2 watt 15Kohm, so use 1watt 30kohm.

According to the comments in the Renard code, the 50Hz part should be automatic, but Phil will clarify I'm sure.

;; initializer for cell timer (replaces TIMER_MAGIC0/1). This assumes 50 Hz,
;; but it will self-adjust after 1/2 AC cycle (better too slow than too fast).

[wjohn]

and 3.3k for 24VAC and 4.7k for 35VAC.

[DeanCollins]

Thanks for the details guys, I managed to find the 3.3 and 4.7 but I couldn't find the 30K 1W resistor, I picked up a 33K 1W as the closest alternative, should this be OK?


Thanks,
-Dean

[xmus]

Thanks for the details guys, I managed to find the 3.3 and 4.7 but I couldn't find the 30K 1W resistor, I picked up a 33K 1W as the closest alternative, should this be OK?


Thanks,
-Dean

It might work, give it a shot, the goal is to limit current to the 1H1AA1, if you take a VOM and test the voltage on the back side of those resistors (in 120VAC land) you get 1VAC...... Going to high wont hurt anything, your only risk would be, the voltage/current would be too low for the 1H1AA1 to detect zero reliably...

[tconley]

look at this link wjohn already did much of that work for you for 220v

http://christmasinshirley.com/wiki/index.php?title=16_Channel_Renard_with_SSR_Assembl y_Instructions

[DeanCollins]

Hello Again,
I swapped out the old 15k 1/2W resistors for the new 33K 1W resistors and checked the voltage after the resistors and it appears to drop from 248 on the wire to 216 after the resistors.

Something I am missing?

Also I had a look at the wiki entry for the xmus modifications and there seems to be alot of changes to the board for 240V but I have only done the ZC resistor swap.

Should it all still work?

Thanks,
-Dean

[xmus]

I would follow wiki, before you trust me!

[DeanCollins]

Thanks guys, managed to get the ZC working great with 24V. Only problem now is framing errors, I will post a new thread for that.

Thanks,
-Dean