Hello all,
I recently attached my velleman k8055. I have different relays to command trough the digital outputs.
Now the problem is I have a 24V powre supply to command all relais. If I connect this 24 V to the velleman my power source is going in protected mode.
Is there a max voltage to use on GND and CLAMP?If so, can the k8055 support 24V DC?
for information I attach the schema that I used:
The digital open collector outputs are specified to max 50V/100mA.
The link to your circuit diagram doesn’t work.
hmm are there any errors in the scheme?
can you tell me why this does not work?
thank you for the reply
No, the problem is that I have no access to see your schema.
Now I logged to the service and checked the schema.
If the red terminal is the CLAMP then this is OK.
Thak you for your fast reply,
I’ve done some tests and I removed all outputs from the velleman, altough when I connect the CLAMP the Dc adapter goes in protected mode. is it possible that the IC4 is broken?
Most probably the IC4 is broken.
I found out that when I mesure the outputs they are all closed (1) but the led’s are off.
I will try to change the IC4.
thank you for your help
hello,
finally I changed the IC4, now I can connect my 24V input on gnd CLAMP
the problem now is that when the 24V power is turned on no outputs works unless I remove the power.
Is there any modification to take to make the k8055 run with 24V ?
The digital open collector outputs are specified to max 50V/100mA.
Does the card stop to work if you have only the 24V voltage connected between the GND and the CLAMP, and all the other outputs are disconnected?
How did you notice the outputs are not working if the 24V is connected:
Have you checked the power supply polarity: + to CLAMP, - to GND.
Exaclty, if I connect the 24V between GND and CLAMP the card stops working, no output leds are on.
The polarity is correct on the power supply and is attached with - on GND and + on CLAMP.
I’ll try this evening to test without any output connected.
beside I will measure the current used to be shure that it does not use more than 100mA (calculated it should use around 40mA max)
Thanks
[quote]Exaclty, if I connect the 24V between GND and CLAMP the card stops working, no output leds are on.[/quote]Does this happen if you remove the IC4?
If yes, then there may be somewhere a solder bridge on the board and the CLAMP voltage goes to unwanted place. Maybe to one of the PIC micro (IC3) outputs or other terminals.
So, I found out the cause of the IC4 failture.
when you look at the schema, on the bottom there are a 220V heater and a 24 V Electrovalve.
now all works correctly if the electrovalve is detached.
If attached I can start the electrovalve and all sounds good. The problem comes when the Relais opens the contact to stop the electovalve then my IC burns.
When I attach directly the elecrovalve on the power supply I can start and stop without problems.
can anyone explane me why this occours?
here is a link to the electorvalve type : http://mt.rsdelivers.com/product/smc/vdw31-5g-4-02f-q/2-port-sol-valve-for-water-air-24vdc-1-4/7013249.aspx
[quote]The problem comes when the Relais opens the contact to stop the electovalve then my IC burns.[/quote]Is it possible that the 24V power supply generates overvoltge spike when the voltage from the solenoid valve is disconnected?
If yes, then the solution can be to use a separate 24V power supply for the solenoid valve.
