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X2 doesn't drop to 5v and 7v

PostPosted: Wed Jan 11, 2017 10:13 pm
by malek
Hello,
I have bought an opentherm gateway from the kiwi website. I have changed the trafo and the 7805, because i wanted to use a esp8266. The changes that were made were recommended in this forum.

This are the parts that i have added:
EI 30/15,5 printtransformator VB 2 VA Primair: 230 V Secundair: 15 V 133 mA 2 VA VB 2,0/1/15 Block (710564-89)
DC/DC-converter, print Recom International R-78E5.0-0.5 24 V/DC 5 V/DC 500 mA Aantal uitgangen: 1 x (157954-89)

Now I was trying to carry out the tests from the otgw website. and at one of these tests I needed to connect the X1 and X2 with each other and then on the IC1 the pin 2 connecten with pin 14 and it suppose to drop the X2 to 5v or 7V but it doesn't show that it show 17V.

Image
Image
this are the results of my test :

1 : measure the voltage on X1 : 30.2V
2: measure the current between the two terminals of X1 : 0.65V
3 : connect pin 3 of the IC1 socket to ground (e.g. pin 5) : 2.04V
4: use two pieces of wire to connect X1 to X2, with OK1 Connected : 17.02V
5: connect pin 2 of the IC1 socket to VDD (e.g. pin 14), X1 and 2 are still connected with each other : 17.02V
6: Measure the voltage on pin 18 of the IC1 socket with pin 3 left open : 0V
7: Measure the voltage on pin 18 of the IC1 socket with pin 3 left closed : 0V

Does someone have a idea how i can solve this problem.
Thanks in advance!

Kind regards,

Malek Sediqi

Re: X2 doesn't drop to 5v and 7v

PostPosted: Fri Jan 13, 2017 3:44 pm
by malek
the links of the pictures weren't working.
drive.google.com/file/d/0B3Mgf9SlnCcoaz ... sp=sharing
drive.google.com/file/d/0B3Mgf9SlnCcoMG ... sp=sharing

I have checked everything but i can't find the problem. I have connected it with my laptop and i'm receiving R0000000 in OTmonitor and if i connect it with my boiler(Remeha avanta 24C) then the OTmonitor prints out disconnected and connected constantly. I have runed the diagnostic.hex file and some of the test i can't run.

TEST 1 : i don't have Leds
TEST 2 : Shows nothing
TEST 3 : Shows nothing
TEST 4 : Shows nothing
TEST 5 : Shows Boiler 0.0V, Thermostat: shows voltage and the reference Voltage was 1.21V
TEST 6 : Shows nothing

This is a project for school and I want it to be finished on time. Does someone have any idea how to solve this problem.

Re: X2 doesn't drop to 5v and 7v

PostPosted: Fri Jan 13, 2017 6:08 pm
by malek
Solved optocoupler was wrong placed. Now i get 6V.

Re: X2 doesn't drop to 5v and 7v

PostPosted: Fri Jan 13, 2017 10:09 pm
by hvxl
Good job figuring this out yourself. And I appreciate that you report back what the problem was even though you solved it on your own.

If you can post a link to your school project when it's finished, I would love to see what you did.