Submersible Pump from Grudziądz Blows 7 Amp Fuse After Few Seconds of Operation

Hello. After a few months of not using the submersible pump, a problem appeared. It throws the fuse in the control device after a few seconds of operation. Phases checked, I swapped the wires for a moment, it will work for a while and nothing ... The control board has a 7 amp fuse. The pump was manufactured in Grudziądz, there are 8 or 9 step, the well is 40 meters deep. Does anyone have any way to get this device to work again?

First of all, check the INSULATION resistance of this pump! If it's ok, then the impeller is blocked. There will be no pulling out

Well, the worst thing is to pull ... - at the top, I can handle it. Have any of you managed to solve it in another way? Recently, after a short break in use, it dumped some dirty water on me, and today not a drop

I guess you can do these measurements on the power supply without removing it, right?

I would like to ask for tips on what to measure with and what values are to be displayed. Thank you in advance. Unfortunately, I do not know what power this pump is, I only remember that it is 8 or 9-stage.

Well, at least write what power this pump is, then we will know how much electricity it should consume
You don't provide enough information, nobody here is a fortune teller

MIREK555 wrote:

I would like to ask for tips on what to measure and what values should be shown.

And does your friend have a meter to measure the insulation resistance (even a 500V inductor) and know how to use it?
Anticipating the answer - it's not about the multimeter ...

Akrzy74_Let him first measure this insulation resistance with a multimeter, due to the nature of the motor - the windings work in water, so the breakdown will be detected even with a small ohmmeter voltage.

Are you sure she's in the water? What kind of control device is it, type of pump
and motor, how deep submerged, did you measure depression, motor insulation condition, where this pump is running. And it's best before pulling it out (without which it probably won't happen) ask someone to check what it has to do with the depths

Hello. Write something more about the "control board" (maybe a clear picture). I'm guessing that it turns off the overload trip (thermal switch), but it's just guesswork. It's hard to say whether the pump is still operational, but if you turn it on mindlessly, it will definitely not be operational.

Quote:

Phases checked

How was it checked? Does this mean that the entire "control board" has also been checked for the patency of the current circuits. Is it off pressure switch and whether it controls the contactor or switches on the phases for the pump; if it switches on the phases, what is the state of its contacts. Are the wires to the pump uninterrupted (this can be checked with an "ordinary" ohmic meter) residual current device (If there is this switch in the installation, does its switching off cause the lack of voltage to power the pump?).

wola wrote:

Are the wires to the pump uninterrupted (this can be checked with an "ordinary" ohmic meter) residual current device (If there is this switch in the installation, does its switching off cause the lack of voltage to power the pump?).

Exactly.
1 Check with an ammeter the starting currents of each of the 3 phases!
2 Check the resistance of the windings with the wires with an ohmmeter.
3 How many wires go to the pump and is there a differential?
4 Is there water in the well? Is there protection against dry running (maybe it ran dry until it seized up?)

PS To fellow "professionals":
The dry-running submersible pump consumes less current - so it does not throw out the protection
Grudziądz submersible pump with insulation resistance of 80 A up to 60 kohm it will work and won't trip the protections (unless it's an RCD). It won't kill the fish in the well either.

Hello, I'm back to this topic after a long break. The pump was excavated, desilted, checked on the surface for operation /-water trough/ and re-submerged. Unfortunately, the specialist lowered it too low and sucked in the mud and ... was extracted again. Measured with a meter on the windings - resistance 4 ohms. I'm afraid she might have gotten too much in the ass after those launch attempts. Motor power 5.5 KW. Is it possible to quickly check if nothing electrically serious has happened to it?/-power drop/. I no longer have the strength or the nerves to pull her up again.

A resistance of 4 ohms between the windings is a short circuit. A meter to measure the winding resistance and the correct measurement.

I just got back from the electrician /-rewinds motors/ he said that the result of 4 ohms on the multimeter is a bit too high - it should be 2-3 ohms, but it is within normal limits. So I don't understand what's going on... The engine starts and works normally /-immersed in water/ my concern is whether it will be able to lift the water column up with sufficient force. He also ordered to check the individual windings with 220V current for a short-circuit with ground. But before I do that, I'd rather wait for your feedback.

I wrote about this only the measurement of "winding short-circuit to ground" is performed with at least a 500V inductor.

jerry1960 wrote:

A resistance of 4 ohms between the windings is a short circuit.

You can indicate where MIREK555 did he write that?

My friend MIREK555 , these 4Ω at this motor power is a bit too much, but the problem lies in the measurement itself, not in the actual winding resistance. Measurement with a multimeter of such small resistances is burdened with a considerable error. Even dirty test lead plugs will give you 1 or 2 ohms.
MIREK555 wrote:

Quote:

I just got back from the electrician /-rewinds motors/

Then why didn't you give him the pump to check?

A trip with a pump to an electrician is about 100 km away for me plus arranging transport. This device weighs a lot so before I do anything I try to orient myself to make the right decision. I was thinking about sinking it back into the trough by screwing in the flow reduction - somewhere by half. Thanks to this, I would create similar conditions for it to work in every day?