Help with print relais /PCB board

[billi]

Thanks Allan , i tied before and now again  , but that is not the problem

Billi, that sounds to me like the relay is stuck in the "on" position.
Unless it is a "feature" of the macerator that it runs the pump when the power is first applied.
Did it always work like this?

When you turn it on do you hear the relay click on ?

No i do not hear the relay ( but pump is loud as well )
And its normal  for the unit ( read it in the manual) when you first connect it to power it will pump regardless of there is something to pump


When the socket switch is now on    and i flush until the toilet is overflowing    and switch the socket of and straight after  on again , it will not pump
But if i wait about 15 sec and then switch it on it will pump

If you stick 24V DC across the coil the correct way you should hear the relay click if it's mechanical Cheesy

So what i call the relay , you call "the coil" ?

[Alan]

Quote “ But if i wait about 15 sec and then switch it on it will pump “

Is it 15 seconds every time you do it ? 

The integrated circuit ( I.C. ) wont like any dirt around / under its pins that
are soldered on to the P.C.B. Its inputs are very high impedance. Any crud
will affect its operation.

It will either be dirt on the P.C.B. Or the pressure sensor slow in operating
( Partial pipe blockage / crud or the sensor diaphragm sticking. )

Or a dry joint on the other side of the circuit board. ?


Regards

Alan

[KLD]

Billi,

Just a quick explanation to the relay: the coil part is an electro magnet. There is also a switch part, most likely with three pins (single pole, double throw, Umschalter auf Deutsch). When you put 24V across the coil, the magnetic force pulls the switch over. When that happens you often can hear the switch clicking. Take the voltage off again, and clack, the switch falls back. Note that Wyleu also said "across the coil the correct way ". There is most likely a diode parallel to the coil (to protect the transistor), and if you connect the 24V DC the wrong way 'round, you simply shorten the power supply.

If it's not too much hassle, I'd take it off the board first before testing.

Klaus

[billi]

Is it 15 seconds every time you do it ?  

Yes Alan  , but i leave the socket switched of after a pee    and switch it on after the next one and off again  

I blew through the pipe  and   seems free and blew (soft) into that pressure-air switch it clicks  ( and when i take the pipe of the first time , there is pressure on /air coming out )

Ok i will clean again  and the integrated circuit    ( how i love image search )




Thanks Klaus (Danke )    so i have to find the DC 24 volt connectrion points and pos and neg   and then connect battery pos to coil pos  and neg to neg

[breezy]

Hi Billi

The datasheet that I linked to earlier was for your proposed replacement relay, not the suspect one. I don't think you'll be able to hear the relay action unless you have very good hearing. In any case, the fact that the action is working, doesn't mean that the contacts are sound - you need to run a continuity check across the relay contacts to prove that.

TBH, I'll be very surprised if the relay is the culprit.

Can you operate the macerator without the PCB? If so (and all else fails) you can send it to me in a small jiffy bag or padded box and I'll put it on the bench for a look-see.

Are there any markings on the IC? If so, it shouldn't be too difficult to reverse engineer the circuit.

[Baz]

I think the big resistor is a 1 W job to drop the 24v down to something lower and more stable for the IC. The IC is probably a timer so that the pump runs for a few minutes after the waer is gone just to make sure. As you seem to be a little short on electronics knowledge you could see if you can find a local teeenager doing electronics or physics GCSE who might have a better idea.

[billi]

Thanks Breezy , Baz will have a look again tomorrow

As you seem to be a little short on electronics knowledge you could see if you can find a local teeenager doing electronics or physics GCSE who might have a better idea

Breezy  you look  slightly older than 18   

Thanks for the offer

Billi

[breezy]

Breezy  you look  slightly older than 18   

Offer retracted.

 

[breezy]

Billi

Did you get any further with this repair?