Calculation engine operation condenser pump Guinard / ELEM

[delnoram]

yes I think we're going around in circles

Otherwise I found that which brings us back practically
to the previous calculation

On an electric motor (Guinard water pump) from 750 W (1CV), 220V, 50 Hz, 1250 RPM: What value of starting capacitor should be adopted? The original value is no longer readable and with 16 micro Farad 400 V the engine refuses to start alone, it must be launched by hand.
Thank you for answering me.

You need about 56μF / 250V or 400V ...

[Christophe]

Yes on.turn a little round: normal for a pump lol

Didiou 56 uF it's a lot ... all the 600 engines at 800w that I saw still had only 16 uF or 20 uF

Good if my multimeter seems to work I had a doubt: I measured a new capacitor from 2uF to 1,95uF ...

I ordered 4 capacitors: 10, 15, 25 and 40 uF ... history to do some tests and combinations in parallel editing

[Christophe]

I ordered 4 capacitors: 10, 15, 25 and 40 uF ... history to do some tests and combinations in parallel editing

Here I received the 4 operating capacitors for testing:



The multimeter capacimeter gives about 15 μF for the 15 μF:



The 2 other than I tested above were cooked ...

Anyone know why there are 4 outputs (the 2 G and D connectors are connected in the capacitor, we can wire it from 4 ways gd: up-up, down-down, up-up, up-down) ?

To easily do paralleling can be?

[Christophe]

I will try the following editing: 10μF, 15μF, 25μF, 35μF (25 + 10), 40 μF, 50 μF (40 + 10) ...

I'll tell you from what capacity the pump restarts ...

[Macro]

That it redémre is a thing. That it maintains its regime in charge is another ... Reminder to charge a centrifugal pump:
it must be fed correctly (if possible with a height of fluid just below its axis) and have it flow freely with the largest flow possible it is in these conditions that it draws the most intensity.

[Christophe]

Just macro: I planned to do startup tests with a hydraulic load ...

I no longer remembered that the maximum power of a pump was with the minimum discharge height (logically physically it should be harder, so more amperage, start a pump with X m of water column above no ?).

In short thanks for this reminder. I will try like this (with a wattmeter taken to control consumption).

This pump will be mounted on a suppressor group tank with pressure switch ... once repaired it will therefore turn between 1.5 and 3 bars approximately.

ps: what is on it is that considering the volume of the capacitor of origin, this one had not more than 20 μF ...

[Christophe]

I just tested all the capacitors on the engine, it does not work better: whether the capacitor is connected or not, the motor reacts the same: it blocks at startup between 0 and 2 seconds and the thermal fuse triggers ...

Example with 2 // capacitor: 25 + 10 = 35 μF





One of the 3 cables to the engine was unsoldered, I sold it back but no change ...

So there is another problem ... I open another subject ...

[Christophe]

Here is the subject: repair of an asynchronous motor of a hydraulic pump that no longer starts (noise and blocking at start-up)

We put the question of capacitors on hold ...