Whats wrong with my Transformer?

[bdunham7]

Maybe try with an ordinary 12V halogen car bulb too? The unit has an max output power 56W and a bulb like that  is 55W.

That's perfect if you have an appropriate holder for it.  Those get really hot and can burn you or break violently.

[ElectricPower]

Maybe try with an ordinary 12V halogen car bulb too? The unit has an max output power 56W and a bulb like that  is 55W.

That's perfect if you have an appropriate holder for it.  Those get really hot and can burn you or break violently.

Thanks. I will try that later today

[BrokenYugo]

Yeah, don't operate a halogen headlamp bulb out of it's housing. They get hot, they can explode, and being quartz they put out some UV light.

[james_s]

Just forget the rubish i posted over. I have missunderstood the transformer unit completely, and in a very stupid way. I said i meassured 4.4VDC at the output, but that is not an output, but an sensor input. 

I can measure 12.8VAC out of the transformer and if i change mode to "detection" and add an movement detector to the box, i can hear the relay clicks when it is movement and voltage to the output turns on/off. When i set it to "ON" i can meassure 12.8VAC all the time.

But when i try to light up an 12V 0.95W LED, the led lights up, but the voltage drops to 7-8VAC. This is my friends transformer and he said that the spot lights in his garage does not light up at all. I think it's because he have 3x 2W spot lights that will create an big voltage drop. The max limit for the unit is 56W.

So the question (i think) is why the voltage drops with just a tiny load. Transformer issue?

If the voltage drops under load that means you have resistance somewhere, it could be a faulty relay or something else. If it's dropping to only 7V with a moderate load that suggests quite a lot of power is being dissipated somewhere so something should be getting hot.

[ElectricPower]

Just forget the rubish i posted over. I have missunderstood the transformer unit completely, and in a very stupid way. I said i meassured 4.4VDC at the output, but that is not an output, but an sensor input. 

I can measure 12.8VAC out of the transformer and if i change mode to "detection" and add an movement detector to the box, i can hear the relay clicks when it is movement and voltage to the output turns on/off. When i set it to "ON" i can meassure 12.8VAC all the time.

But when i try to light up an 12V 0.95W LED, the led lights up, but the voltage drops to 7-8VAC. This is my friends transformer and he said that the spot lights in his garage does not light up at all. I think it's because he have 3x 2W spot lights that will create an big voltage drop. The max limit for the unit is 56W.

So the question (i think) is why the voltage drops with just a tiny load. Transformer issue?

If the voltage drops under load that means you have resistance somewhere, it could be a faulty relay or something else. If it's dropping to only 7V with a moderate load that suggests quite a lot of power is being dissipated somewhere so something should be getting hot.

Good point. I will try some load and look for the heat

[james_s]

Yeah, don't operate a halogen headlamp bulb out of it's housing. They get hot, they can explode, and being quartz they put out some UV light.

I do it all the time, never had an issue with it. I just use clip leads on an old H4 bulb that still has a working high beam filament. If I'm going to operate it for an extended period of time I dangle it into a glass jar.

[ElectricPower]

I found out that it was a bad relay that caused the failure.

I changed it and now it works again

[james_s]

Glad you got it working, thanks for posting the update to let us know. I figured the relay was a likely suspect, there just isn't much else in the circuit path.

[perieanuo]

btw, after what i see on that lab table(the test gear), i'm surprised you ask such simple questions

And I'm surprised by other peoples stupis statements.

Do you mean that a lot of equipment automatically makes you an engineer?

I bought the equipment because I want something to grow with and provide opportunities to learn things faster.

excuse me sir, it's your constitutional right to burn your scope and be impolite. people like you doesn't deserve to be helped, you made bad measurements, incomplete description, we just tried to adjust this, we didn't mention the word stupid for describing you, maybe we should.

[ElectricPower]

btw, after what i see on that lab table(the test gear), i'm surprised you ask such simple questions

And I'm surprised by other peoples stupis statements.

Do you mean that a lot of equipment automatically makes you an engineer?

I bought the equipment because I want something to grow with and provide opportunities to learn things faster.

excuse me sir, it's your constitutional right to burn your scope and be impolite. people like you doesn't deserve to be helped, you made bad measurements, incomplete description, we just tried to adjust this, we didn't mention the word stupid for describing you, maybe we should.

I just answered. You are suprised that i cant understand because i have a lots of equipments? That is for me a stupid statement. I also answered why i have the equipment, so you now next time i post stupid questions.