Rework Station Pump - Can They Be Repaired ?

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

the fishtank ones are 60Hz

it's to see if the current is there with the voltage.

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

If you hook up the lamp (low wattage lamp) to the two wires of the pump, you should see the lamp goes bright or dim when you turn the Pump control knob up and down. It looks to be just a simple lamp dimmer circuit.

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

BTW, the two wires for the pump are Blacks, but the two wires soldered to the back of the board are Yellow and Violet?
The resistance of the pump windings are good, not showing open circuit?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

I soldered two longer wires to the pump so I could inspect it's operation outside the unit.

The pump seems ok, it measures fine and worked when driven with a series of batteries.

BUT I don't know how I missed this because it was one of the first things I checked when I suspected the pump itself was ok but after all this I found a short from MT2-Gate on the non-heatsinked triac.

I'm going to remove it from the board shortly for verification.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

The triac is a BT137-600E and is shorted between MT1 and MT2. No short on the board.

What devices might have one of these so I can harvest the part at least temporarily ?

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

if it's fucked, put a heatsink on the new one.

try looking in lamp dimmers or things with variable speed motors - like vac cleaners.

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

If MT1 to MT2 is shorted then the pump should be on all the time at full blast, same symptom when the TRIAC shorted out in the lamp dimmer the lamp will be on bright.
Something is not making sense here.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

The air volume knob was changing the voltage applied to the pump but at 60hz it was just buzzing. Maybe the function of the triac is to change another variable beyond ac voltage ?

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

The frequency feeding the load (pump or lamp) will be the same as the line frequency.
The Voltage is to the load is the function of the on time of the TRIAC on each half of the cycle.

the two magnetic coils are connected out of phase to get the push-pull effect on the movable magnet piece.
BTW, this is some basic principle how the Double Diaphragm pump functions.
http://www.lutzpumps.com/desktopdefa...8/#prettyPhoto
https://www.youtube.com/watch?v=Y6To-bgL4GE
https://www.youtube.com/watch?v=OMSPpS2hjqQ

I wonder what the operating Voltage for your pump is. Per this site it shows 24~27V.
http://www.alibaba.com/product-detai....29.124.lEwW5z

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

The text in the pictures shows 24~27V, but the technical Data sheets shows 220 VAC.
http://www.alibaba.com/product-detai....29.124.lEwW5z

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

If the function of the triac circuit is to vary the voltage then it is working except as you say that it may be feeding an overvoltage. I tested the pump itself with batteries and it took about 50v to move the piston sluggishly from one side to the other so it would surprise me if it was designed to work on 24v.

I don't have another triac to install yet would it do any troubleshooting good to move the good triac to the spot where the shorted one was ?

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

You should get the replacement.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Triac replaced, no shorts found. Fault remains.

Any ideas where to look/measure ?

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

is there a diac connected to the triac?

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

I see DIAC D15 connected to the GATE of the TRIAC and the other end of the DIAC is connected to the RC Phase shift network.
What ACV do you have between the incoming Neutral wire and MT1, MT2?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

is there a diac connected to the triac?

Yes there is.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

I see DIAC D15 connected to the GATE of the TRIAC and the other end of the DIAC is connected to the RC Phase shift network.
What ACV do you have between the incoming Neutral wire and MT1, MT2?

I have 120v at MT1 and the voltage at MT2 is variable with the knob on the front, between 60-120v so that seems to be working but something else obviously isn't.

[budm]

Re: Rework Station Pump - Can They Be Repaired ?

I have 120v at MT1 and the voltage at MT2 is variable with the knob on the front, between 60-120v so that seems to be working but something else obviously isn't.

So do you also see 60~120V between the two wires of the pump?

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

let's just do a quick test - connect the pump directly to the mains - through a small fuse please.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Can do tomorrow. Are you suggesting that little piston should oscillate at 60hz because I think it would explode first.

And the fuse is in case one of the coils is shorted ? What size is appropriate ?