3Phase Motor breaker - overload schematic

Lafardo · Feb 10, 2022

Hi all,
I recently bought a CNC router and dust collector and need to connect it to my 3x380v+N power source.
I want the CNC router connected to the under/over voltage protection and the motor also connected to the overload protection.
Can someone please check if I connect the machines as in my schematic it will all work.
Learned in school how to, but that was more than 30 years ago

Thanks in advance.

[ElectriciansForums.net] 3Phase Motor breaker - overload schematic

Lucien Nunes · Feb 10, 2022

It looks OK to me, electrically. Consider whether there is a need to fuse down the contactor coil circuit, often there is not.

You would need to satisfy yourself that any safety requirements for the operation of the machinery are met according to your local regulations. If the CNC machine and extractor are complete in themselves, that should not be difficult.

Lafardo · Feb 11, 2022

Lucien Nunes said:
It looks OK to me, electrically. Consider whether there is a need to fuse down the contactor coil circuit, often there is not.

You would need to satisfy yourself that any safety requirements for the operation of the machinery are met according to your local regulations. If the CNC machine and extractor are complete in themselves, that should not be difficult.

Thanks a lot for your professional advice, yes you are right, I think installing a fuse in the contactor circuit is better. Small expense, more safe.

3Phase Motor breaker - overload schematic

Lafardo

Lucien Nunes

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Lafardo

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