K2636 speed controller

Kits General
1

Hi chaps,
I just built a K2636 speed controller which I am trying to debug. I am in the UK where our voltage is 240 so I not surprised that the schematic voltages shown on page 11 of the manual are doubled. However I get 18,15,0,14 and 13 between the 5 transformer pins and neutral without VAC connected. Then when VAC is linked to the supply as shown on page 8, these values go up 250, 240,2, 240 and 235. I have no speed control but the LED and the fuses are all OK. Any tips what I can check next. Thanks a lot Dick

2

What load did you connect to the output?
Is the output zero or is the load fully on (100% output)?
Can you supply links to HI-RES and SHARP pics of your assembly (both solder- and componentside)?

3

[quote=“VEL417”]What load did you connect to the output?
Is the output zero or is the load fully on (100% output)?
Can you supply links to HI-RES and SHARP pics of your assembly (both solder- and componentside)?[/quote]

Hello vellaman thanks for replying. These voltages are the same with or without the 340 watt load running. Because of some of your other streams about this controller I have also tried it with a 60 watt incandescent bulb. The bulb remains permanently bright - no dimming effect. Do you have any comment on the transformer voltages noted before I send over some photo shots? Thanks dick

4

Sorry, it is not very clear to us how you measured these voltages.
Normally, when the output is fully on, this points to a defective triac, if no other assembly errors are made.
Some pictures would help a lot.

5

Thank you for replying again. I measured the voltages on each solder sided transformer pin ie top row with 5 pins and bottom row with 4 pins between each of them and my supply neutral. I have taken 2 photos which I am trying to add as attachments to this note but so far have failed. They are in jpeg format but I cant see how attachments can be added to this forum business. Thanks for your patience. Dick

6

As transformer secundaries are isolated from the mains, you cannot measure these voltages with the neutral as reference.
Please supply the pics as links, this board does not allow picture uploads.
(e.g. use a free online picture base).

7

[quote=“VEL417”]As transformer secundaries are isolated from the mains, you cannot measure these voltages with the neutral as reference.
Please supply the pics as links, this board does not allow picture uploads.
(e.g. use a free online picture base).[/quote]

Thank you again for your reply I will try and create the picture links but I did send them to you via direct email having failed via the forum. Meanwhile I have been checking the dc voltages around the components and seem to have 12 volts around most of them, dropping to 6volts at R5, R8,R9. R 11 and R3 . The triac voltage is 12v up to r9 and T4 where it drops to 6v so I am wondering whether to replace transistor T4. Regards Dick