Bunnings 4 outlet programmable power board

OK. I have the results of the post mortem. I'll be back with the result in a bout 30 minutes. I have resize the pics and watch a little of the footy!

Col.

Well I suppose I've waited this long so another 30 minutes wont hurt..especially if your a West coast supporter, I know you'll rather be on the discus forums than watch them get thrashed by the saints !


For me go Collingwood

O.K. Here we go. This will be spread over several post due the amount of photo's I have.

P.S. I'll have a brief run down in the last post. I'll then pull my briefs back up and describe what I've found.

:shock:

Looks great (well not the crappy soldering). I bet all we have to do is fit our own board where the LCD is placed, add a couple of opto isolators and we are set. I hope the ribbon cable running to the LCD just needs four of the conductors taken down to ground for the relays to turn on.

So, If we power the LED side of the Opto's from the 1wire bus and hopfully just connect the outputs into the ribbon cable. I suppose we need to know if the LCD relay control lines are either taken high or low. Open collector type of opto ?


Keep em comming

When I re-assembled the power board, I manage to get the LCD to work the way it should!

VERY IMPORTANT!!!!! The relays I presume are switched by 24VDC however, I did not measure this as there is no isolations from the mains! No transformers, no optocouplers. The entire circuit is LIVE!!!

This circuit can be very easily modified. Each individual relay is controlled by its own individual output line from the timer IC. No Multiplexing. This signal is feed in the C945 (NPN) transistor base pin. The Emitter is to what I presume to be a 0V rail. The collector connected to the +V rail by way of the relay. The relay has a supression diode for reverse EMF protection when the relay is de-energised. Also of the collector pin, is a 6.2Kohm resistor which in turn is then hooked up to the LED above the respective outlet to indicate its power status.

One strange thing that I noticed is that the 0V and +V rails for relays 1 and 2 were common but relays 3 and 4 had there own seperate 0V and +V rails which were only common to them!

Probably explains why there are 2 bridge rectifiers IC's on the AC input side of things.

I have some ideas on how mod this for one wire operation. It does involve sourcing a seperate 24VDC supply. Preferably one that is isolated from the mains. Other than that, rip the guts out except for the surge protector, mains cap, circuit breaker, relays, diode, resistors for the LEDs and the LED board. Apply your required signal to the Base of the transistors to switch the relays on.

Any questions??? PM me!!! :D

I hope you enjoyed. P.S. Did any one get the breifs gag???

great write up !

I assume fi we can just replace the lcd board we the same size cct board, the 1wire connections can be positioned to pop out of the LCD window ?

I would rather use the 5VDC on the 1wire bus to switch some optos and somehow wire the outputs into the existing cct. Hopefully no mods at all to the base board just solder the ribbon to a new cct board.

I gotta get one of these however on the other hand, need the time....How do you think they generate the low voltage to run the board ? Do they have one of those switch mode IC's ?

This is the power supply.

No switchmode. A couple of rectifiers and then some high volatge resisitors and zener diodes (CR1, 2 and 3).

As I said in my post, there is NO isolation from the mains. If a fault occured here, it could travel back into the 1-wire network and introduce a live mains voltage into your other equipment.

GAF Yes What A P.OS ! ,Just A Quick Question "I Bought A Dual Module Timmer/Outlet But It Could Not Switch Both Relays AT The Same Time When It Stated That It Could . So My Question Is Can All Of The Relays Be Switch Individually At Any Time ? Or Do They Work In Tandem ?Bald_noggin Can You Program The Timer Unit For All Types Of Oppertions Eg 1 On 2,3,4 Off. 1,2 On 3,4 Off Etc Etc .

Cheers Tommo

P.S If you Ever Need To Call These @#@$wits Bont Bother Cos They Dont Even Know What They Sell !! "Past Experience"