Velux VSE Electric Skylight Repair

Hello all, new member here looking for some advice repairing a 10 year old Velux electric skylight.

My multi-meter shows no power coming coming out, from the converter. I'm trying to get some suggestions for a substitute power converter to use as Velux wants $250 for a replacement, which frankly, is insane.

It's a simple 24 volt, AC/DC, 60 watt, 60 Hz, Class 2 power converter.

I saw a thread on this forum from a couple of years ago where people seemed to have actually solved this very problem. Unfortunately, they never identified the specific converter they purchased.

http://www.doityourself.com/forum/do...working-2.html

What I need to know is whether it's "switched" or "unswitched" type, constant current or constant voltage, and what amperage. Some folks who replaced them used as little as one amp, others used 2.5 amps... does it even matter?

I asked the Velux representative and he wasn't a lot of help. He said the amperage of the motor was "pretty low, like half an amp", but said he didn't know for sure. He thought it could be slightly higher on startup. He didn't think it made a difference what kind of power converter was used. Maybe he's right?



Thanks in advance for the help!

 

Welcome to the forums.

Your thread in the electrical forum is gone. We keep one topic in a single thread.

You have a picture of a transformer in the picture. Is that what is bad ? 120vac in and nothing out ?

 

Thanks PJ, sorry about the double posting...

Yes, that's the bad transformer in the pic. And yes, 120 VAC in and nothing out. Plastic enclosure says "Class 2 Supply 24 volts" on the side. Local electric supply store said it's obsolete and couldn't tell me anything else about it.

 

Just to clarify..... the part in your picture on the right is a transformer. You put 120vac on the input wires and you get 24vac out of it. Are you not getting 24vac out of that part ?

The piece in white is the controller.... correct ?

 

Yes, the transformer is the part on the right with the wires coming out of it. That's the part that isn't producing any output voltage. The white piece is just the plastic cover that snaps over it. Ignore it.

The skylight works like so:

The motor, pc board and transformer are mounted under the skylight.

120VAC runs from the house wiring to the transformer, which sends 24VDC out to the pc board. The pc board serves as the switch that tells the skylight to go up or down when it receives a command from a hand-held, battery operated remote controller.

Again... I think I've isolated the problem to the transformer. I'm just trying to figure out what type of replacement transformer to get. I don't want to pay Velux $250 when I am fairly certain another one will work at one-tenth the cost.

 

Just one correction.... the transformer puts out 24v AC.

Here's one that will work for you. You need 60watts..... it's rated for 56 watts.
187E24 Hammond Manufacturing | Mouser

 

24v AC? Wow, thanks Pete ... now I'm really confused.

On the earlier thread I linked to, people were repairing these Velux VSE skylights by using 24v DC transformers. The advice they were being given - and that seemed to work - was "You can repair these units (power supply) by purchasing a simple 24V DC adapter/power supply, and connecting it to the 24v terminals on the sensor board."

Mind if I ask how you know this transformer is AC/AC and not AC/DC? I'm not advanced enough in electronics to know.

So then if it is 24VAC, would this transformer work?

http://www.alliedelec.com/white-rodg...40f1/70101870/

Appreciate the help.

 

I'm in the same predicament. The transformer has stopped functioning. Velux wants $250 to replace the whole circuitry. It seems like a straightforward transformer. So I was wondering if you ever figured out which transformer to use.
Thanks.

 

If the control board is good and just the transformer has gone bad..... you can change the transformer. If your board has an extra set of screw terminals for DC in....then you can use a DC supply and connect it there.