Rework Station Pump - Can They Be Repaired ?

[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

[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

[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 ?

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.

[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.

[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 ?

[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.

[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?

[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.

[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.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

No because I measure 120v @ 60hz at the pump (coil) terminals. I have to believe that 60hz is way too fast for that little piston so I'm relatively certain something in the circuit must have failed.

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

did you try replacing it with a lamp?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Need some help here before I back over this thing with my car.

Can anyone shed some light on how the pump is driven based on the pics of the board I posted earlier ?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Used a short stack of 9v batteries to drive the piston in both directions so the pump itself is fine.

The driver board itself consists of two BT137 triacs, an op amp, a couple of caps and several diodes and resistors including eleven high wattage ones.

Earlier I measured the ac voltage to be variable (60-120v) at 60hz. There is no way this piston can oscillate that fast so there must be a breakdown of the circuit feeding it.

Can anyone explain how they think the ac wave is constructed to drive the pump ? By what means can this circuit change a 120v 60hz voltage to say 120v at 5hz ?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

That is the same unit as mine essentially. My diaphragms are fine though.

The pump has no markings whatsoever.

[vinceroger69]

Re: Rework Station Pump - Can They Be Repaired ?

theres a link in this video at the end that maybe usefull
https://www.youtube.com/watch?v=azmuyKNEyeI

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

no, unless you see an isolation transformer the pump is live.

is the pump marked with it's voltage or wattage etc?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

But at 60hz I'd doubt I would even see flicker ? Won't hurt to try.

I don't think I'm comfortable hooking up my scope to mains which is why I was wondering if the motor was somehow isolated from mains already.

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

if your scope is good for mains - go for it.
if not, hook a small coil or inductor to the scope probe, put the voltage to max sensitivity per div, and put it on the wire!!

you should get a lamp with variable brightness from full to something less - not nothing obviously, but maybe 20% or so.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

That is a good idea. From what I have read about triacs they can be used for phase angle control.

What should I expect to see with a bulb ? If it's safe to hook up a scope to the motor leads then I can do that, too.