24VAC 10A transformer for HobbyCNC NZ

[blasttiod]

Hi all,
Can anyone help please?

I'm in New Zealand and am looking to buy a surface mount transformer for my HobbyCNC Pro setup.
The transformer needs to have an output of 24VAC @ 10A.


Heres the one that HobbyCNC recommends but its for the USA voltage:

http://www.alliedelec.com/Search/Pro...617F#tab=Specs


Regards

[neilw20]

part number MT-2130.
http://www.jaycar.co.nz/productView....Max=&SUBCATID=

12.5A is a bit more than you asked for.
At this power don't expect SURFACE MOUNT. Would not even fit through an oven !

[Al_The_Man]

Originally Posted by neilw20 . At this power don't expect SURFACE MOUNT. Would not even fit through an oven !

Probably means printed circuit mount
Al.

[Dazza]

Hi,

When you say surface mount, it usually means the transformer will be directly soldered to the PCB.

If cost is an issue there are other alternatives but not ideal solutions, you can use two smaller transformers or more in parallel or series to meet your requirements, as long as they're identical and you should use a very low value resistors at a suitable wattage, to ensure each transformer shares the load evenly, you can also use old computer power supplies in series or parallel, but can be even less ideal and a little more difficult to do.

I have used both of these methods with good results.

Darren.

[blasttiod]

Hi All,

Cheers, have ordered the one from Jaycar: MT-2130
Although I'm not sure how to connect it using the in series feature?


Regards

[neilw20]

Join PINK and YELLOW (yellow!) wires, and insulate from the rest of the world. This is the center tap.
24V AC comes from the RED and WHITE wires.

Connect mains power to the orange wires.
IMPORTANT: !!!!
PUT a 1.25 A Slow Blow Fuse in series with one of the primary orange wires.
It's easy to get the smoke out. Hard to get it back in again.

I assume you are making a power supply and will have a rectifier on this unit.
You will have to get rid of up to 25 watts of heat from the rectifier, so make sure it has a good heat sink.
Smallest Jaycar heatsink for this is HH-8570. 2.5 degrees C/Watt or lower is required to give a trouble free power supply.

Try not to put any switches or fuses in the secondary side.
If running stepper drivers run individual pairs of power wires to each driver from your filter capacitor.

Ask more questions before trying things and you won't have to put he smoke back.