Cement Mixer Switch Connection: Three-Phase Motor, Coil Resistance, Cable Connections

Question

Hello. I need help connecting the cement mixer switch to a three-phase motor. The problem is that the switch does not lock, locks when pressed, you only have to hold it all the time. I unscrewed it seems that the cables are well connected I also measured the coil resistance and once it came out...

e2rd.o · Answer

Coil for what voltage is, maybe N does not come as it is on 230V.

Sniezynka · Answer

Hello, The coil is 230V type 305.230 and is very often damaged.

wojtek 9007 · Answer

Hello - please trace the contactor self-support again Helpful post; Added after 1 [minutes]: This contactor is on 230V

albertg08 · Answer

I am green in this topic so the coil is broken because the switch is on 230 V yes?

Sniezynka · Answer

If, after pressing the start button, the contactor does not switch on and the measurement of the coil winding resistance is variable, it indicates that the coil is damaged, you need to replace the entire automaton (contactor).

tomex79 · Answer

It is not a coil, because when the start button is pressed the contactor is switched on.
Maybe the problem is with the "stop" button, which should be of the NC type.
A friend of Wojtek 9007 may be right ...

Sniezynka · Answer

In fact, I did not read that it turns on, so the coil works, but why such discrepancies in measurements? The contact in the contactor remains. That is, parallel circuit switching with the contacts of the start button.

tomex79 · Answer

Only in this contactor I do not see an additional contact to support: -4 working contacts and coil power supply ... I would check if the stop button is closed (NC).

Krzysztof Reszka · Answer

Since when the 3 phase motor has 4 wires of the current circuit. And what is marked on the contactor 13-14.

nikusert · Answer

Hello .
I met with such a solution for connecting such a switch (of course, 230V coil) that four wires came out of the motor.
Three are known stator, while the fourth was the center of the star. The coil was powered from one phase, the other end of the coil connected to the fourth. That was the 230V coil supply. It was not a self-made connection, but the original connection of a table saw, so-called circular from the market for example Castorama etc. The power plug had of course four pins, three phase and a fourth PE.
Greetings.

lukasz19875 · Answer

Hello, I have a similar problem, i.e. when I hold the start button of the concrete mixer, the concrete mixer works and when it is released it stops working
The connection looks like the picture photo of the contactor
Of course, the ground cable (yellow-green) is connected to the motor housing

I am asking for help / hint what is wrongly connected

nikusert · Answer

You need to check if there is a phase on the white wire on the right side after pressing the green start button.
You can also disconnect the white wires and check with a multimeter (meter) if there is a transition.

Cement Mixer Switch Connection: Three-Phase Motor, Coil Resistance, Cable Connections

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