Maico er-60G Fan's Fast Mode Malfunction: MKP2 2.2uF 400 VAC Class B Capacitor Replacement

Hey, the fast mode in the above-mentioned fan did not give me, a new one is the cost of about 700 zł so of course I would prefer to repair.

The fan works in such a way that the slow mode is permanently on, while the fast mode is activated by a separate switch. The slow gear works, while the fast gear does not, but it seems to want to turn on.
Well, I found a defective mkp2 2.2uF 400 VAC Class B capacitor from F&T. The capacitor has barely half the capacity.
Well, unfortunately I can't find it anywhere. In fact, I have not even been able to determine a similar mkp.

There is a circuit board, powered from the mains - a circuit that is designed to shift the phase and probably its task is to start fast rotation.
The motor is 1 phase, unfortunately I don't know much about its paramaters. There are basically 3 condensers, w oprniki and 1 varistor. I will post the schematic later, if it would be useful to deduce a possible replacement.

Does anyone perhaps know where to look for such a contraption? And anyway, what is the difference between MKP and MKP2? The only thing I have determined is that the mkp2 has a lower intrinsic resistance and performs better in high-frequency circuits. And here's the question, this type of circuit rather works only at 50Hz. So is it necessary to use MKP2? I guess it could be MKP with identical capacitance and go.

The only other question is what kills the MKP? Well, and if this capacitor is killed, did the varistor survive?

Well, and the question is still about the varistor (s14 k320), could you advise me how to test such a contraption outside the circuit?
Could it perform a role other than protection? It is mounted on the ground, at the very input of the network.

Thanks in advance for any help.

lezacy_bykiem wrote:

Just another question what kills the MKP? Well, and if this capacitor is killed, did the varistor survive?

Download the schematic. Does this motor have wa gears or a thyristor based regulator?
A capacitors nowadays are usually sputtered (metallized) foil rolled into a roll - now imagine what happens when a large current flows through the sputtered metal - the metal is gradually lost (eg. from old age, or from excessive current), the electrical cut off the rest of the tape, the capacitance decreases because the area is a fraction of the area of the entire tape - this is my working hypothesis.

Quote:

Well, and the question is still about the varistor (s14 k320), could you advise me how to test such a contraption outside the circuit?

You would have to have a regulated AC voltage source and see if the varistor's conduction current increases at higher voltages. In a residential setting you are unlikely to check.

Quote:

Could it perform a role other than protection? It is mounted on the ground, at the very input of the network.

Rather a protection, it sits in parallel to the network and "short-circuits" the surges that occur, blowing the fuse.

Don't miracle. Install what you have or buy any 2.2u/400V or 600V capacitor as long as it fits.
I don't know where you got 400VAC from? and what for? With this capacitance and voltage it is difficult to buy a bad capacitor in terms of type. On the other hand, it is easy to buy some Chinese wick described magnificently. It's a bit of a lottery. Probably you will risk these about 2 zl??
Such varistors are not checked only for about 1 zl buy new ones.

Thanks to you, will try to replace this capacitor and varistor as advised by jack63.

Quote:

Give the schematic.

As for the schematic, I tried to draw it with this wonderful tool built in the electrode and I have enough impressions for tonight. Everything fell apart before I finished And I drew the schematic based on the board. Eh. Anyway the schematic is a black magic for me, I will try to draw it on paper tomorrow and paste a picture because the programs are killing me.
Well, but whatever. But what's true is true adjustable source I don't have. I thought there was a way to get these varistors, because I'm curious if something happened to it or not. All in all, I've come to terms with the thought of replacing them just in case, since I can't test.

Quote:

This motor has wa gears, or a regulator on a thyristor?

Hmm... regulator on a thyristor is not there. Does it have two gears.... hmmm... not necessarily, I don't know how it could be regulated, I thought maybe with these capacitors. - That is, the phase shift. I'm just starting my adventure with electronics, so I'm dealing with rather simple things for now. And AC is a white paper for me so far

jack63 wrote:

It's easy to buy some Chinese wick described magnificently. It's a bit of a lottery. I think you'll risk the about £2????

2 zł. I can risk, even 30 with shipping, while, I would rather not lead to a fire when the disaster is spectacular and I will not be at home


Added after 20 [minutes]:

jack63 wrote:

Install what you have or buy any capacitor 2.2u/400V or 600V as long as it will fit.

You misunderstood me, I don't have any capacitor, the one I write about is hit in the circuit. And as for any, most 2.2uF is 400VDC nor VAC. The closest I've found is 250VAC, and that's dangerously close to the minimum circuit voltage.
I'm just a little surprised that only one manufacturer makes capacitors with the above parameters - F&T. I haven't found any other, hence it seems very suspicious to me, either it's there on the high side or just the opposite. For replacing the board Maico charges 270 zloty. And the hit is only that one dumb capacitor no and perhaps a varistor. The real cost is pennies of some kind.

lezacy_bykiem wrote:

As for the schematic, I tried to draw it with this wonderful tool built into the electrode

Draw a sketch of how the motor is connected through these capacitors to the power supply. The device is rather of the "better" ones so there may be "strange" solutions used (such as DC motor, etc.).

Quote:

All in all, I've come to terms with the idea of replacing it just in case, since I can't test it.

The varistor if it gets hit hard in the ass it tends to fall to pieces, and if it is visually good it often works. This is how its damage is most often diagnosed - visually (or replaced just in case).

Quote:

Does it have two gears.... hmmm... not necessarily, I don't know how it could be regulated, I thought maybe with these capacitors. - That is, phase shift.

As it has more than 3 wires to the motor it is possible that it has windings from 1st and 2nd gear, it could also be powered by series capacitors limiting the power of the motor, but this is rather for small motors. A schematic of the connection, however, would be useful.

Quote:

.... I do not have any capacitor, the one I write about is hit in the circuit. And as for any, most 2.2uF are 400VDC nor VAC. The closest I've found is 250VAC, and that's dangerously close to the minimum circuit voltage.

250VAC will be fine - it's a dedicated capacitor for 230V AC mains equipment. 400VDC is a "universal" capacitor in my opinion, it may have worse performance at high currents (working as a starting capacitor), but it should still work.

Replacing the capacitor helped, the fan works as bad. I installed: 2.2uF 1000V 37.5mm WIMA MKP-4 due to the lack of an identical one to the original one.

What about the buzzing, I gushed a little silicone oil into the motor slots and after about 30 minutes of operation everything returned to normal.

Thanks to everyone for their help. Regards.

I will reheat this chop a little. Symptoms similar, in one case nothing worked, in the other - fast mode. The fault lies with the capacitors - 2.2uF is responsible for the fast mode, 1.5uF for the start. Due to the lack of such as in the original on the market, you can use the available ones.
Varistors do not move.

Reheating the cauldron again - I own a wonderful work of German technical thought - a Maico ER 60 GVZ fan. It worked properly and unnoticeably for itself for 5 years and after that time it is only unnoticeable because it stopped working. I removed it from the box, I noticed that despite the lack of rotation the motor body was warm, almost hot. By eye, I assessed that nothing of the electronics looked damaged. For lack of better ideas [and to make my wife admire my commitment] I cleaned it of dust and dirt and reinstalled it in the box. Surprisingly it started to work, but very sluggishly, after switching to a faster mode it is indeed faster, but only compared to the standard mode. Compared to the fan from the other bathroom, it lost [so by ear] from 50-70% of power. A new one costs a bit, so I wanted to see if I could fix it. The question is, does the idea of replacing the capacitors make any sense with these symptoms?

aj29 wrote:

Reheating the cauldron - I own a wonderful work of German technical thought - a Maico ER 60 GVZ fan. It worked properly and unnoticeably for itself for 5 years and after that time it is only unnoticeable because it stopped working. I removed it from the box, I noticed that despite the lack of rotation the motor body was warm, almost hot. By eye, I assessed that nothing of the electronics looked damaged. For lack of better ideas [and to make my wife admire my commitment] I cleaned it of dust and dirt and reinstalled it in the box. Surprisingly it started to work, but very sluggishly, after switching to a faster mode it is indeed faster, but only compared to the standard mode. Compared to the fan from the other bathroom, it lost [so by ear] from 50-70% of power. A new one costs a bit, so I wanted to see if I could fix it. The question is whether the idea of replacing the capacitors makes any sense with these symptoms?

I think it does. The cost is relatively small, the time consumption negligible.